Upsilon1 Hydrae

Upsilon1 Hydrae
Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Hydra
Right ascension	09^h 51^m 28.6937^s
Declination	−14° 50′ 47.771″
Apparent magnitude (V)	4.12
Characteristics
Spectral type	G6/8III^[1]
Astrometry

Distance	273.48 ly (83.89 pc)

Details

Mass	3.34 ^[1] M_☉
Radius	17.1 R_☉
Luminosity	174^[1] L_☉
Temperature	5045^[1] K
Age	270^[1] million years

Other designations
Upsilon 1 Hya, 39 Hya, HD 85444, BD-14 2963, HIP 48356, HR 3903, SAO 155542.

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

The Okayama Planet Search team published a paper in 2005 reporting investigations on radial velocity variations observed for a set of orange giant stars and announcing the detection of a brown dwarf companion in an eccentric orbit around Upsilon1 Hydrae.^[2] The orbital period is roughly 4.1 years.

The Upsilon1 Hydrae planetary system
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥49 M_J	3.9	1500	0.57	—	—

References

1 2 3 4 5 Takeda; et al. (2008). "Stellar Parameters and Elemental Abundances of Late-G Giants". Publications of the Astronomical Society of Japan. 60 (4): 781–802. arXiv:0805.2434. Bibcode:2008PASJ...60..781T. doi:10.1093/pasj/60.4.781.
↑ Sato; et al. (2005). "Radial-Velocity Variability of G-Type Giants: First Three Years of the Okayama Planet Search Program". Publications of the Astronomical Society of Japan. 57 (1): 97–107. Bibcode:2005PASJ...57...97S. doi:10.1093/pasj/57.1.97.

Stars of Hydra

Bayer	α (Alphard) β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ¹ τ² υ¹ υ² φ¹ φ² φ³ χ¹ χ² ψ ω

Flamsteed	1 2 3 6 9 10 12 14 15 17 19 20 21 23 24 25 26 27 28 29 33 34 37 44 47 48 50 51 52 54 55 56 57 58 59 60 17 Crt 14 Lib 30 Mon 31 Mon 2 Sex

Variable	R S U V W X RT RW RX SX SZ TT TW VX VZ WZ AI AV CT DF EX EZ FG GK HQ HS II IL IY KU KZ LN LO LQ LR LV LX MO MX NS OY QT V335 V355 V406 V419 V478

HR	3212 3269 3271 3272 3285 3288 3295 3305 3338 3342 3374 3378 3383 3392 3411 3446 3458 3478 3480 3486 3493 3526 3529 3538 3554 3557 3564 3578 3584 3590 3596 3636 3638 3649 3651 3653 3675 3687 3704 3714 3741 3749 3750 3758 3760 3762 3763 3767 3772 3785 3788 3794 3796 3801 3802 3805 3808 3810 3822 3848 3858 3862 3908 3919 3921 3923 3931 3963 3965 3977 3986 3988 3991 4005 4011 4055 4068 4071 4076 4117 4123 4130 4149 4152 4157 4158 4162 4172 4190 4214 (3 Crt) 4225 4251 (6 Crt) 4261 4282 4298 4302 (8 Crt) 4307 4328 4331 4334 (10 Crt) 4339 4346 4373 4445 4449 (18 Crt) 4458 (20 Crt) 4469 (22 Crt) 4473 (23 Crt) 4498 4503 (26 Crt) 4525 4542 4548 4553 4558 4565 (29 Crt) 4579 4612 4628 4651 4723 4735 4774 4803 4810 4839 4857 4860 4918 4978 5090 5097 5098 5120 5128 5166 5167 5197 5209 5228 5246 5265 5309 5314 5324 5356 5399 5565

HD	68667 72659 74156 74685 75098 75217 76027 76478 78614 79481 79994 82943 83352 86226 86264 88806 90156 94046 (5 Crt) 97344 105113 106500 107869 117033 121758 125279

Gliese	Gliese 357 Gliese 433 Gliese 453 GJ 2066 GJ 3517 GJ 3634

Other	BD -3 2525 BD-22 3467 CE 315 EC 14026-2647 HAT-P-35 HAT-P-42 HE 1327-2326 IRC -20197 Kelu-1 LHS 2065 LHS 3003 2MASS 0835-08 2MASS 1114-2618 PSR B0820+02 PSR B0834+06 TWA 5 WASP-15 WASP-25 WASP-36 WISE 0855−0714

List

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