List of stars in Hydra - AbsoluteAstronomy.com

This is the list of notable star

Star

A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...

s in the constellation

Constellation

In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....

Hydra
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake...

, sorted by decreasing brightness.

Name	B Bayer designation A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...	F Flamsteed designation Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek letters. Each star is assigned a number and the Latin genitive of the constellation it lies in...	G. Gould designation Gould designations for stars are similar to Flamsteed designations in the way that they number stars within a constellation in increasing order of right ascension. Each star is assigned an integer , followed by " G. " , and then the Latin genitive of the constellation it lies in...	HD Henry Draper Catalogue The Henry Draper Catalogue is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension , published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the...	HIP	vis. mag. Apparent magnitude The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...	abs. mag. Absolute magnitude Absolute magnitude is the measure of a celestial object's intrinsic brightness. it is also the apparent magnitude a star would have if it were 32.6 light years away from Earth...	Dist. (ly)	Sp. class Stellar classification In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...	Notes
Alphard Alphard Alphard is the brightest star in the constellation Hydra. The name Alphard is from the Arabic الفرد , "the solitary one", there being no other bright stars near it. It was also known as the "backbone of the Serpent" to the Arabs. In ancient China it formed part of an asterism called the "red bird"...	α	30	140	81797	46390	1.99	−1.69	177	K3III	Alfard, Kalbelaphard, Cor Hydrae, Soheil al Fard, Soheil Solitarius
γ Hya Gamma Hydrae Gamma Hydrae is a Class G8, third-magnitude star in the constellation Hydra. Gamma Hydrae is a yellow giant, located about 130 light-years from Earth.-Modern legacy:γ Hya appears on the flag of Brazil, symbolising the state of Acre....	γ	46	345	115659	64962	2.99	−0.05	132	G8III
ζ Hya Zeta Hydrae Zeta Hydrae is a Class G9, third-magnitude star in the constellation Hydra. Zeta Hydrae is a yellow giant star located about 150 light-years from Earth.-Name and etymology:...	ζ	16	77	76294	43813	3.11	−0.21	151	G8III-IV
ν Hya Nu Hydrae Nu Hydrae is a Class K2, third-magnitude star in the constellation Hydra. Nu Hydrae is an orange giant star located about 140 light-years from Earth....	ν		254	93813	52943	3.11	−0.03	138	K0/K1III
π Hya Pi Hydrae Pi Hydrae is a Class K2, third-magnitude star in the constellation Hydra. Pi Hydrae is an orange giant star located about 100 light-years from Earth....	π	49	368	123123	68895	3.25	0.79	101	K2III
ε Hya Epsilon Hydrae Epsilon Hydrae is a Class G5, third-magnitude star in the constellation Hydra. Epsilon Hydrae is a binary star with components of magnitudes 3.3 and 6.8, separated by 2.7 arcseconds...	ε	11	59	74874	43109	3.38	0.29	135	G0III-IV	BY Draconis variable BY Draconis variable BY Draconis variables are main sequence variable stars of late spectral types, usually K or M. The name comes from the archetype for this category of variable star system, BY Draconis. They exhibit variations in their luminosity due to rotation of the star coupled with star spots, and other...
ξ Hya Xi Hydrae Xi Hydrae is a third-magnitude star in the constellation Hydra. The star is situated 130 light-years from Earth, and has a radius about 10 times that of the Sun, and a luminosity nearly 60 times as large...	ξ		288	100407	56343	3.54	0.55	129	G8III
λ Hya	λ	41	201	88284	49841	3.61	0.88	115	K0III
μ Hya	μ	42	221	90432	51069	3.83	−0.58	248	K4III
θ Hya	θ	22	108	79469	45336	3.89	0.91	129	B9.5V
ι Hya	ι	35	170	83618	47431	3.90	−0.74	276	K3IIIvar	Ukdah
HD 71155	c		19	71155	41307	3.91	0.99	125	A0V
υ¹ Hya Upsilon1 Hydrae Upsilon1 Hydrae is a yellow giant star in the constellation of Hydra. The star is one of Okayama Planet Search's main target for planet search and has turned out to host a substellar companion.-Substellar companion:...	υ¹	39	178	85444	48356	4.11	−0.51	273	G6/G8III	has a brown dwarf Brown dwarf Brown dwarfs are sub-stellar objects which are too low in mass to sustain hydrogen-1 fusion reactions in their cores, which is characteristic of stars on the main sequence. Brown dwarfs have fully convective surfaces and interiors, with no chemical differentiation by depth... companion
δ Hya Delta Hydrae Delta Hydrae is a Class A1, fourth-magnitude star in the constellation Hydra. Delta Hydrae is a binary double star, located about 180 light-years from Earth.-Name and etymology:...	δ	4	36	73262	42313	4.14	0.44	179	A1Vnn	Lisan al Shudja, Lingua Hydri
β Hya Beta Hydrae Beta Hydrae is a double star in the constellation of Hydra. Its overall apparent visual magnitude varies by 0.04 magnitudes with a period of 2.344 days, and is approximately 4.27 at maximum brightness. The brighter star in the double is a giant Bp star which has been classified as an...	β		301	103192	57936	4.29	−0.96	365	Ap Si	α² CVn variable
η Hya	η	7	49	74280	42799	4.30	−1.48	466	B3V...	β Cep variable Beta Cephei variable Beta Cephei variables are variable stars which exhibit variations in their brightness due to pulsations of the stars' surfaces. The point of maximum brightness roughly corresponds to the maximum contraction of the star. Typically, Beta Cephei variables change in brightness by 0.01 to 0.3...
12 Hya	D	12	60	74918	43067	4.32	0.11	227	G8III
ρ Hya	ρ	13	64	75137	43234	4.35	−0.72	337	A0Vn
58 Hya	E	58	387	130694	72571	4.42	−0.44	305	K3III
σ Hya Sigma Hydrae Sigma Hydrae is the 4th-magnitude star in the constellation Hydra. Sigma Hydrae belongs to spectral class K1+III and has apparent magnitude +4.44...	σ	5	42	73471	42402	4.45	−0.72	352	K2III	Minhar al Shija, Al Minliar al Shuja, Minchir
τ² Hya Tau Hydrae The Bayer designation Tau Hydrae is shared by two star systems, τ¹ Hydrae and τ² Hydrae, in the constellation Hydra...	τ²	32	152	82446	46776	4.54	−1.20	459	A3V	Ukdah
τ¹ Hya Tau Hydrae The Bayer designation Tau Hydrae is shared by two star systems, τ¹ Hydrae and τ² Hydrae, in the constellation Hydra...	τ¹	31	145	81997	46509	4.59	3.43	56	F6V	Ukdah
υ² Hya	υ²	40	194	87504	49402	4.60	−0.05	277	B8V
HD 74395	F		51	74395	42835	4.63	−1.71	604	G2Ib
2 Sex		2	168	83425	47310	4.68	0.06	274	K3III
ο Hya	ο		293	101431	56922	4.70	−1.21	495	B9V
141 G. Hya	G		141	81799	46371	4.72	1.06	176	K1III
174 G. Hya	I		174	83953	47522	4.76	−1.16	497	B5V
26 Hya		26	122	80499	45751	4.77	−0.19	320	G8III
51 Hya	k	51	375	125932	70306	4.78	1.14	175	K3III
27 Hya 27 Hydrae 27 Hydrae is an evolved yellow giant star in the constellation of Hydra. The star is suspected to host a low-mass companion.-Substellar companion:...	P	27	124	80586	45811	4.80	0.43	243	G8III-IV+...	unconfirmed planet Planet A planet is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.The term planet is ancient, with ties to history, science,... ?
9 Hya		9	47	74137	42662	4.87	0.89	204	K0IIICN...
181 G. Hya			181	85859	48559	4.87	−0.19	336	K2III
241 G. Hya			241	92036	51979	4.87	−0.97	479	M1III
U Hya			240	92055	52009	4.89	−1.16	528	C	240 G. Hya. Carbon star Carbon star A carbon star is a late-type star similar to a red giant whose atmosphere contains more carbon than oxygen; the two elements combine in the upper layers of the star, forming carbon monoxide, which consumes all the oxygen in the atmosphere, leaving carbon atoms free to form other carbon compounds,...
φ Hya	φ, φ³		242	92214	52085	4.91	0.72	225	G8III	242 G. Hya
χ¹ Hya	χ¹		264	96202	54204	4.92	1.73	142	F3IV/V
175 G. Hya			175	84117	47592	4.93	4.07	49	G0V	nearby
17 Crt		17	284	100286	56280	4.93	2.80	87	F8V
183 G. Hya			183	85951	48615	4.94	−1.74	706	K5III
ψ Hya	ψ	45	341	114149	64166	4.94	0.69	231	K0III
l Hya	l	52	379	126769	70753	4.97	−0.56	415	B7/B8V
6 Hya	a	6	44	73840	42509	4.98	−0.57	419	K3III
ω Hya	ω	18	95	77996	44659	4.99	−2.86	1212	K2II-III
160 G. Hya			160	82734	46880	5.02	−0.03	334	K0III
κ Hya	κ	38	173	83754	47452	5.07	−0.92	515	B4IV/V	Al Sharāsīf
50 Hya		50	370	124206	69415	5.07	0.83	229	K2III
44 Hya		44	230	91550	51718	5.08	−1.36	633	K5III
II Hya (298 G. Hya)			298	102620	57613	5.10	−0.72	477	M4III
287 G. Hya			287	100393	56332	5.13	−0.58	453	M1/M2III
54 Hya	m	54	382	129926	72197	5.15	2.73	99	F0V + G/K
295 G. Hya			295	101666	57047	5.20	−0.40	430	K5III
47 Hya		47	365	121847	68269	5.20	0.11	339	B8V
257 G. Hya	b³		257	94388	53252	5.23	2.75	102	F6V
56 Hya		56	385	130259	72357	5.23	0.19	331	G8/K0III
23 Hya		23	112	79910	45527	5.24	0.58	279	K2III
303 G. Hya			303	103462	58082	5.26	0.48	295	G8III
61 G. Hya			61	74988	43142	5.28	0.19	339	A3V
14 Hya		14	67	75333	43305	5.30	−0.34	438	B9MNp...	KX Hya; α² CVn variable
200 G. Hya			200	88215	49809	5.30	3.12	89	F2/F3IV/V
1 G. Hya			1	68312	40107	5.36	0.43	316	G8III
142 G. Hya			142	81809	46404	5.38	2.91	102	G2V
328 G. Hya			328	109799	61621	5.41	2.72	113	F0V
271 G. Hya			271	96819	54477	5.43	1.61	189	A1V
249 G. Hya	b¹		249	93397	52737	5.44	1.30	219	A3V
330 G. Hya			330	110666	62131	5.46	0.03	397	K3III
20 Hya		20	103	78732	44961	5.47	−1.00	642	G8II
367 G. Hya HD 122430 HD 122430 is an orange giant star about 440 light years away in the constellation of Hydra on the celestial sphere. The star has completely run out of the hydrogen fuel that keeps it stable, although its age is only 3.1 billion years old, younger than the Sun’s 4.6 billion years. HD 122430 has a...			367	122430	68581	5.47	−0.15	434	K2/K3III	has a planet Extrasolar planet An extrasolar planet, or exoplanet, is a planet outside the Solar System. A total of such planets have been identified as of . It is now known that a substantial fraction of stars have planets, including perhaps half of all Sun-like stars... (b HD 122430 b HD 122430 b is a giant planet orbiting around the giant star HD 122430. It has a mass at least 3.71 times that of Jupiter. This planet located at a distance of 1.02 astronomical units away from its star, which is very similar to the Earth’s distance from the Sun. Despite of this, the higher... )
24 Hya		24	114	79931	45526	5.49	−1.14	689	B9III
15 Hya		15	70	75737	43496	5.55	−0.33	488	A4m
33 Hya	A	33	163	82870	46982	5.56	−1.04	681	K1III	Ukdah
323 G. Hya			323	108323	60735	5.56	−0.42	511	B9V
224 G. Hya			224	90957	51364	5.58	0.21	387	K3III
195 G. Hya			195	87808	49569	5.59	0.48	343	K4III
225 G. Hya			225	91120	51491	5.59	−0.28	487	B8/B9IV/V
2 Hya		2	23	71297	41375	5.60	1.97	173	A5III-IV	LM Hya; δ Sct variable Delta Scuti variable A Delta Scuti variable is a variable star which exhibits variations in its luminosity due to both radial and non-radial pulsations of the star's surface. Typical brightness fluctuations are from 0.003 to 0.9 magnitudes in V over a period of a few hours, although the amplitude and period of the...
19 Hya		19	99	78556	44883	5.60	−1.60	898	B9.5III
28 Hya		28	134	81420	46221	5.60	−0.98	675	K5III
1 Hya		1	15	70958	41211	5.61	3.44	89	F3V
55 Hya		55	384	130158	72323	5.61	−0.76	613	B9IV/V
92 G. Hya			92	77353	44356	5.64	−0.73	613	K0III
333 G. Hya			333	111295	62500	5.65	0.80	304	G8III
59 Hya		59	392	132219	73284	5.65	0.50	350	A6IV
148 G. Hya			148	82077	46511	5.66	−1.58	913	K4/K5III
χ² Hya	χ²		265	96314	54255	5.69	−1.26	799	B8V	265 G. Hya.; β Lyr variable Beta Lyrae variable Beta Lyrae variables are a class of close binary stars. Their total brightness is variable because the two component stars orbit each other, and in this orbit one component periodically passes in front of the other one, thereby blocking its light. The two component stars of Beta Lyrae systems are...
350 G. Hya			350	117716	66065	5.69	1.61	214	A0/A1V
56 G. Hya			56	74794	43026	5.70	1.04	278	K0III:
193 G. Hya			193	87427	49339	5.70	1.23	255	F0V
259 G. Hya			259	95221	53699	5.70	2.27	159	F2V
236 G. Hya			236	91889	51933	5.71	3.76	80	F7V
291 G. Hya			291	100893	56620	5.71	0.54	352	K0III
3 Hya		3	35	72968	42146	5.72	1.14	268	A1spe...	HV Hya; α² CVn variable
107 G. Hya			107	79181	45158	5.72	0.90	300	G8III
102 G. Hya			102	78702	44923	5.73	1.22	260	A0/A1V
351 G. Hya			351	118349	66400	5.73	0.36	386	A7V+...
17 G. Hya			17	71095	41299	5.74	−0.59	601	K5III
156 G. Hya			156	82573	46813	5.74	0.58	351	A4III
80 G. Hya			80	76376	43798	5.75	0.17	425	K2/K3III
101 G. Hya			101	78668	44936	5.76	0.01	460	G6III
57 Hya		57	386	130274	72378	5.76	0.14	434	B9.5V
48 Hya		48	366	122066	68390	5.77	1.98	187	F6V
121 G. Hya			121	80479	45743	5.79	0.34	400	K1/K2III
272 G. Hya			272	97023	54561	5.79	0.69	342	A1V
33 G. Hya			33	72660	42028	5.80	0.80	326	A1V
88 G. Hya			88	76932	44075	5.80	4.16	70	F7/F8IV/V
354 G. Hya			354	118646	66563	5.81	2.36	160	F3V
357 G. Hya			357	119752	67143	5.81	1.08	287	A0V
118 G. Hya			118	80050	45559	5.83	0.44	389	K0III
60 Hya		60	393	132851	73566	5.83	0.84	325	A4IV
300 G. Hya			300	103026	57841	5.85	3.36	102	F8V
150 G. Hya			150	82232	46618	5.86	1.45	249	K2III
329 G. Hya			329	109960	61720	5.86	−0.26	547	K2/K3III
252 G. Hya			252	93657	52841	5.87	0.29	426	A1V
374 G. Hya			374	125276	69965	5.87	4.62	58	F7Vw
32 G. Hya 32 G. Hydrae 32 G. Hydra is a G-type giant in the constellation Hydra....			32	72561	42008	5.89	−5.22	5433	G5III
14 G. Hya			14	70652	41080	5.92	−1.11	832	M1III
162 G. Hya			162	82747	46897	5.92	1.12	297	B9.5V
304 G. Hya			304	103596	58158	5.93	0.11	477	K4III
84 G. Hya			84	76579	43899	5.95	−0.82	738	K3III
158 G. Hya			158	82660	46859	5.95	−1.06	823	K4III
289 G. Hya HR 4458 HR 4458 is a binary star system in the constellation Hydra. At a distance of 31 light years, they are the closest stars to the solar system within this constellation. The pair has an angular separation of 16.2″....			289	100623	56452	5.96	6.06	31	K0V
27 G. Hya			27	71766	41597	6.01	−1.39	985	F2III
75 G. Hya			75	76151	43726	6.01	4.85	56	G3V
136 G. Hya			136	81567	46288	6.01	−1.14	876	K3III
209 G. Hya			209	89455	50536	6.01	1.89	217	A8III
φ² Hya	φ²		234	91880	51905	6.01	−1.35	967	M1III
16 G. Hya			16	70937	41214	6.03	1.98	211	F2V
6 G. Hya			6	70013	40818	6.04	−0.21	579	G8III
227 G. Hya			227	91280	51551	6.04	2.90	138	F6/F7V
243 G. Hya			243	92245	52113	6.04	0.83	359	A0Vn
361 G. Hya			361	121156	67890	6.05	2.04	206	K2III
260 G. Hya			260	95456	53818	6.06	3.59	102	F8V
90 G. Hya			90	77250	44315	6.08	−0.84	789	F3IV+...
179 G. Hya			179	85519	48396	6.08	0.66	395	K0III
65 G. Hya			65	75140	43204	6.09	−0.46	667	K0
322 G. Hya			322	108110	60603	6.09	−0.38	643	K3III
21 Hya		21	106	79193	45184	6.10	1.51	269	A3m	KW Hya; Algol variable Algol variable Algol variables or Algol-type binaries are a class of eclipsing binary stars where the orbital plane of the stars are coincident with the line of sight from Earth. When the cooler component passes in front of the hotter one, part of the latter's light is blocked, and the total brightness of the...
231 G. Hya			231	91706	51795	6.10	2.09	207	F6V
372 G. Hya			372	124576	69623	6.10	−0.54	695	A1V
155 G. Hya			155	82543	46840	6.11	0.58	416	F7IV-V
OY Hya (188 G. Hya)			188	86612	48943	6.11	−0.31	628	B5V	Be star Be star A Be star is a B-type star with prominent emission lines of hydrogen in its spectrum. The designation is combined by the spectral class, B, and the lowercase e denoting emission in the spectral classification system. Line emission from other atomic ions might be present as well, but is typically...
9 G. Hya			9	70148	40859	6.12	0.12	516	K2III
73 G. Hya			73	75916	43580	6.12	1.04	338	K1III
154 G. Hya			154	82477	46768	6.12	0.92	358	K0
157 G. Hya			157	82638	46869	6.12	0.72	393	K0
217 G. Hya			217	89911	50790	6.12	−0.55	704	A0V
10 Hya		10	52	74591	42931	6.13	2.12	207	A6V
81 G. Hya			81	76494	43902	6.13	−1.34	1016	G8II-III
153 G. Hya			153	82428	46744	6.13	2.46	177	F0Vn
13 G. Hya			13	70574	41036	6.14	2.07	212	A8IV
105 G. Hya			105	79108	45167	6.14	0.83	376	A0V
146 G. Hya			146	82043	46529	6.14	0.32	475	F0III
MO Hya (334 G. Hya)			334	111786	62788	6.14	2.24	196	A0III	δ Sct variable
363 G. Hya			363	121699	68177	6.14	−0.17	596	K2/K3III
286 G. Hya			286	100307	56293	6.15	−0.59	728	M2III
NS Hya (96 G. Hya)			96	78196	44738	6.16	−1.25	991	M1III
315 G. Hya			315	105686	59307	6.16	1.14	329	A0V
302 G. Hya			302	103266	57971	6.17	1.78	246	A2V
8 G. Hya			8	70110	40858	6.18	3.13	133	F9V
37 G. Hya			37	73281	42299	6.18	0.79	391	K0
89 G. Hya			89	77084	44162	6.19	3.20	129	F5IV/V
359 G. Hya			359	120455	67523	6.19	0.97	361	A0V
LV Hya (305 G. Hya)			305	103789	58272	6.20	0.88	378	B9.5V	α² CVn variable
261 G. Hya			261	95698	53963	6.21	2.59	173	A9III/IV
356 G. Hya			356	119623	67071	6.21	−0.47	706	K3III
58 G. Hya			58	74860	43035	6.22	−4.13	3835	K5III
182 G. Hya			182	85905	48584	6.23	0.50	457	A2/A3III
205 G. Hya			205	88699	50066	6.23	0.74	409	A9m...
311 G. Hya			311	105078	59008	6.23	−0.51	728	B7V
371 G. Hya			371	124281	69458	6.23	−0.46	709	K0III
199 G. Hya			199	88182	49802	6.24	1.74	259	A5m
245 G. Hya			245	92770	52391	6.24	−0.53	738	K3/K4III:
147 G. Hya			147	82074	46543	6.25	2.57	177	G6IV
159 G. Hya			159	82674	46893	6.25	0.70	421	K0
197 G. Hya			197	88025	49689	6.25	0.01	578	A0V
149 G. Hya			149	82180	46569	6.26	−2.26	1646	K2/K3III
144 G. Hya			144	81980	46504	6.27	1.47	297	F0Vn
185 G. Hya			185	86266	48763	6.27	2.06	227	A4V
391 G. Hya			391	131919	73171	6.28	0.12	557	B8/B9V
235 G. Hya			235	91881	51885	6.29	3.07	143	F5V
126 G. Hya			126	80719	45854	6.30	2.88	158	F6V
192 G. Hya			192	87344	49321	6.30	0.47	477	B8V
HQ Hya (7 G. Hya)			7	69997	40766	6.31	1.14	353	F3IIIp	δ Sct variable
37 Hya		37	171	83650	47427	6.31	−1.33	1098	A0Vn	OW Hya; 171 G. Hya.
337 G. Hya			337	112519	63243	6.31	0.83	407	K0III
111 G. Hya			111	79752	45424	6.32	1.18	348	A0V
292 G. Hya			292	100953	56657	6.32	2.04	234	F5V
165 G. Hya			165	83104	47070	6.33	1.63	283	A0V
71 G. Hya			71	75811	43570	6.34	0.22	547	A5V
104 G. Hya			104	79066	45150	6.34	2.81	166	A9IVe...
V335 Hya (316 G. Hya)			316	106198	59588	6.34	−0.89	911	M4/M5Ib/II:
317 G. Hya			317	106257	59622	6.34	0.86	406	A0V
34 G. Hya			34	72908	42142	6.35	0.21	551	G9III
275 G. Hya			275	97393	54725	6.35	−0.23	676	M2/M3III
369 G. Hya			369	124162	69398	6.35	0.49	484	K2III
373 G. Hya			373	125279	69977	6.35	−0.69	834	K5III
206 G. Hya			206	88806	50142	6.36	−1.70	1336	M1III
50 G. Hya			50	74393	42854	6.37	−0.40	738	B9.5III-IV
172 G. Hya			172	83731	47454	6.37	−0.68	838	A2V
29 G. Hya			29	72462	41893	6.38	2.13	231	A7IV/V
320 G. Hya			320	107869	60468	6.39	−0.57	803	K5III
34 Hya		34	167	83373	47249	6.40	1.10	375	A1V
R Hya R Hydrae R Hydrae is a Mira-type variable star in the constellation Hydra.The magnitude of R Hydrae varies over a period of 389 days, between 3.21 and 11.00. The period of R Hydrae changes slowly....			347	117287	65835	6.40	−2.55	2012	M6/M7e	Mira variable Mira variable Mira variables , named after the star Mira, are a class of pulsating variable stars characterized by very red colors, pulsation periods longer than 100 days, and light amplitudes greater than one magnitude in infrared and 2.5 magnitude in visual...
55 G. Hya			55	74688	42951	6.41	1.71	283	F2+...
LO Hya (25 G. Hya)			25	71663	41564	6.42	1.77	278	A5m
66 G. Hya			66	75217	43246	6.42	0.68	458	K0
308 G. Hya			308	104039	58436	6.42	−0.76	891	A1IV/V
364 G. Hya			364	121758	68224	6.42	0.17	579	K1III
26 G. Hya			26	71665	41547	6.43	−0.65	849	K0
74 G. Hya			74	76027	43623	6.43	0.89	417	K1III
274 G. Hya			274	97344	54703	6.43	0.84	427	K0III
332 G. Hya			332	111226	62448	6.43	−0.66	853	B8V
360 G. Hya			360	120690	67620	6.43	4.93	65	G5V
263 G. Hya			263	95857	54030	6.44	−0.38	753	M2/M3III
279 G. Hya			279	98221	55164	6.44	3.09	152	F3V
281 G. Hya			281	99712	55953	6.44	−1.50	1264	K4/K5III
294 G. Hya			294	101563	57001	6.44	3.35	135	G2III/IV
54 G. Hya			54	74685	42981	6.45	0.93	414	K0
117 G. Hya			117	79994	45543	6.45	1.19	368	K0
166 G. Hya			166	83352	47242	6.45	0.74	452	K0
204 G. Hya			204	88595	50013	6.45	3.33	137	F7V
258 G. Hya			258	94619	53387	6.45	0.00	637	K1III
349 G. Hya			349	117718	66060	6.45	3.08	154	F5IV
48 G. Hya			48	74190	42701	6.46	1.13	379	A5m
109 G. Hya			109	79481	45305	6.46	0.26	567	G6/G8III/IV
325 G. Hya			325	109074	61172	6.46	0.25	568	A3V
82 G. Hya			82	76478	43850	6.47	−0.51	813	K2III
213 G. Hya			213	89816	50728	6.47	1.18	373	A4IV/V
270 G. Hya			270	96723	54430	6.47	0.74	457	A1V
3 G. Hya			3	68667	40263	6.48	0.47	519	K0
63 G. Hya			63	75098	43152	6.48	−0.36	762	A2V
100 G. Hya			100	78614	44888	6.48	1.07	394	K0IIICN...
297 G. Hya			297	102438	57507	6.48	5.23	58	G5V
299 G. Hya			299	102888	57749	6.48	0.57	495	G8III
348 G. Hya			348	117558	65969	6.48	1.78	284	A1V
378 G. Hya			378	126400	70538	6.48	2.05	251	K0III
233 G. Hya			233	91790	51852	6.49	2.20	235	A5IV/V
312 G. Hya			312	105113	59021	6.49	2.94	167	G0V
342 G. Hya			342	114576	64375	6.49	1.23	367	A5V
346 G. Hya			346	117033	65682	6.49	−1.12	1087	K5III
210 G. Hya			210	89747	50693	6.50	2.68	189	F3IV
318 G. Hya			218	106500	59742	6.50	0.75	461	K0III
29 Hya		29	139	81728	46365	6.53	−1.48	1304	A2V
164 G. Hya HD 82943 HD 82943 is a yellow dwarf star approximately 89 light-years away in the constellation of Hydra. Two extrasolar planets have been confirmed to be orbiting it, and it is thought that the system had more giant planets that were "swallowed" by the parent star...			164	82943	47007	6.54	4.35	90	G0V	has two planets (b HD 82943 b HD 82943 b is an extrasolar planet approximately 89 light-years away in the constellation of Hydra. The planet was announced in 2000 by the Geneva Extrasolar Planet Search Team. The planet is the outermost planet of two.... & c HD 82943 c HD 82943 c is an extrasolar planet approximately 89 light-years away in the constellation of Hydra. The planet was announced in 2001 to be orbiting the yellow dwarf star HD 82943. The planet is the innermost planet of two.... )
17 Hya		17	79	76370	43822	6.67	1.72	319	A3
HD 90156 HD 90156 HD 90156 is a 7th magnitude G-type main sequence star located approximately 129 light years away in the constellation Hydra. This star is smaller, cooler, fainter, and less massive than our Sun. Also its metal content is over half as much as the Sun. In 2009, a gas giant planet was found in orbit...				90156	50921	6.95	5.23	72	G5V	has a planet (b HD 90156 b HD 90156 b is an extrasolar planet which orbits the G-type main sequence star HD 90156, located approximately 129 light years away in the constellation Hydra. This planet has at least 17.6 times the mass of Earth and takes over seven weeks to orbit the star at a semimajor axis of 0.264 AU... ); variable star
V Hya V Hydrae V Hydrae is a variable star in the constellation Hydra. It is considered by astronomers to be a carbon star. With a B-V colour index of +5.5 it is one of the reddest stars visible. It has a period of approximately 18 years and a sub-period of approximately 530 days....				47111	83085	7.0			C	Carbon star
25 Hya		25		80105	45588	7.07	1.50	424	K0
HD 86264 HD 86264 HD 86264 is a 7th magnitude F-type main sequence star located approximately 237 light years away in the constellation Hydra. In August 2009, it was announced that an exoplanet was found in an eccentric orbit....				86264	48780	7.42	3.12	237	F7V	has a planet (b HD 86264 b HD 86264 b is an extrasolar planet which orbits the F-type main sequence star HD 86264, located approximately 237 light years away in the constellation Hydra. This planet orbits in a very eccentric path around the star with a period of about four years. This planet can be as close as 0.86 AU to as... )
HD 72659 HD 72659 HD 72659 is a yellow dwarf star in the Hydra constellation. The apparent magnitude is +7.48 and the distance is 168 light years away from Earth. An extrasolar planet was discovered orbiting this star in 2003....				72659	42030	7.48	3.93	168	G0	has a planet (b HD 72659 b HD 72659 b is a superjovian exoplanet massing at least 3.3 MJ orbiting at 4.77 AU from the star taking 3630 days to orbit. The orbital distance range from 3.49 AU to 6.05 AU with orbital eccentricity of 0.269.... )
HD 74156 HD 74156 HD 74156 is a yellow dwarf star in the constellation of Hydra, 211 light years from our solar system. It is known to be orbited by two giant planets.- Star :...				74156	42723	7.62	3.57	211	G0V	has three planets (b HD 74156 b HD 74156 b is an extrasolar planet at least 1.88 times the mass of Jupiter that orbits the star HD 74156. It is most likely a gas giant. This planet was discovered in April 2001 by Dominique Naef and Michel Mayor along with the second planet HD 74156 c.... , c HD 74156 c HD 74156 c is an extrasolar planet at least eight times the mass of Jupiter orbiting the star HD 74156. It is most likely a gas giant. This planet was discovered by Dominique Naef and Michel Mayor in April 2001 together with the first planet HD 74156 b.... , & unconfirmed d)
φ¹ Hya	φ¹	43		91369	51614	7.62	3.25	244	G2V
HD 86226 HD 86226 HD 86226 is a G type yellowish white star found in the constellation of Hydra. Due to the reactions it had when placed under a Doppler test, 13 Magellan Doppler Velocity observations were made of an object found near the star...				86226	48739	7.93	4.79	139	G2V	has a planet (b HD 86226 b This planet is a eccentric Jupiter gas giant discovered by the Magellan Planet Search Program in 2010.... )
HD 70573 HD 70573 HD 70573 is a 9th magnitude star approximately 149 light-years away in the constellation of Hydra. The star is young, only 101 million years old.-Planetary system:...				70573		8.70	5.40	149	G1-1.5V	has a planet (b HD 70573 b HD 70573 b orbits the youngest RV host star HD 70573 approximately 149 light-years away in the constellation of Hydra. The discovery of the planet is important because it enables the study of debris disks around young stars in relation to presence of planets.... )
Gliese 433 Gliese 433 Gliese 433 is a dim red dwarf star in the constellation of Hydra, roughly 29.5 light years away from Sun. Astronomers have announced the discovery of a very low-mass extrasolar planet in close orbit.-Planetary system:...					56528	9.79	10.01	29	M1.5	has a planet (b)
TW Hya TW Hydrae TW Hydrae is an orange dwarf star approximately 176 light-years away in the constellation of Hydra . The star is the closest T Tauri star to the Solar System. TW Hydrae is similar in mass to the Sun, but is only about 5-10 million years old...					53911	11.1	7.3	184	K8Ve	T Tauri star T Tauri star T Tauri stars are a class of variable stars named after their prototype – T Tauri. They are found near molecular clouds and identified by their optical variability and strong chromospheric lines.-Characteristics:... , retracted planet
WASP-25						11.87	5.74	550	G4	has a transiting planet (b)
GJ 3634 GJ 3634 GJ 3634 is a red dwarf star in the Hydra constellation. One planet has been discovered in its orbit, GJ 3634 b. GJ 3634 is under half the mass and size of the Sun, and is estimated to be at least a billion years younger, and lies near to Earth, with a distance of 19.8 parsecs . It was targeted by...						19.8		65	M2.5	has a planet (b GJ 3634 b GJ 3634 b is a Super-Earth in the orbit of the nearby red dwarf GJ 3634. The planet is approximately eight times the mass of Earth, and orbits its star every two and a half days at a distance of .0287 AU... )

The source of this article is wikipedia, the free encyclopedia. The text of this article is licensed under the GFDL.