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HIP 57274 - Wikipedia

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HIP 57274
Observation data Epoch J2000 Equinox J2000
Constellation	Ursa Major
Right ascension	11^h 44^m 40.9643^s^[1]
Declination	+30° 57′ 33.4509″^[1]
Apparent magnitude (V)	8.96^[2]
Characteristics
Spectral type	K5 V^[2]
U−B color index	+1.06^[3]
B−V color index	+1.111±0.016^[4]
Astrometry

Radial velocity (R_v)	+29.76±0.35^[1] km/s
Proper motion (μ)	RA: −27.069±0.081^[1] mas/yr Dec.: −381.708±0.079^[1] mas/yr
Parallax (π)	38.6381 ± 0.0499 mas^[1]
Distance	84.4 ± 0.1 ly (25.88 ± 0.03 pc)
Absolute magnitude (M_V)	6.89^[2]

Details^[2]

Mass	0.73±0.05 `M`_☉
Radius	0.68±0.03 `R`_☉
Luminosity	0.19±0.01 `L`_☉
Surface gravity (log g)	4.71±0.1 cgs
Temperature	4,640±100 K
Metallicity [Fe/H]	+0.09±0.05 dex
Rotation	45 d
Rotational velocity (v sin i)	0.5±0.5 km/s
Age	7.87±5 Gyr

Other designations
BD+31° 2290, Gaia DR2 4021079911593673600, GJ 439, HIP 57274, SAO 62684, LTT 13227, 2MASS J11444095+3057339^[5]
Database references
SIMBAD	data
ARICNS	data

HIP 57274 is a star in the northern circumpolar constellation of Ursa Major with a system of three planets.^[2] It is invisible to the naked eye, having an apparent visual magnitude of 8.96.^[2] The distance to this system is 84.4 light years based on stellar parallax, and it is drifting further away with a radial velocity of +30 km/s.^[1] The star has a relatively high rate of proper motion, traversing the celestial sphere at the rate of 0.382 arcsecond/year.^[6]

This is an ordinary K-type main-sequence star with a stellar classification of K5V.^[2] It appears to be older than the Sun with an age of roughly eight billion years and is spinning slowly with a projected rotational velocity of under 1 km/s. The star has 73% of the mass of the Sun and 68% of the Sun's radius. The abundance of elements heavier than helium is about the same or slightly higher than in the Sun. The star is radiating just 19% of the luminosity of the Sun from its photosphere at an effective temperature of 4,640 K.

Planetary system

The three exoplanets orbiting HIP 57274 were discovered by the radial velocity method in 2011, all of them having mass significantly greater than the Earth.^[2] A 2014 search for planetary transits was unsuccessful.^[7] The planetary orbits are possibly highly variable, being strongly affected by mean motion resonances.^[8] The most stable region for a hypothetical super-earth within the star's habitable zone would be an orbit inside 0.37–0.56 AU from the host star.^[8]

The HIP 57274 planetary system^[2]^[8]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥11.6±1.3 $M$ _🜨	0.0713±0.00163	8.1352±0.004	0.187±0.10	—	—
c	≥0.41±0.01 $M$ _J	0.1778±0.0041	32.03±0.02	0.05±0.02	—	—
d	≥0.53±0.03 $M$ _J	1.007±0.027	431.7±8.5	0.27±0.05	—	—

References

^ ^a ^b ^c ^d ^e ^f ^g Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Fischer, Debra A.; et al. (2012). "M2K. II. A Triple-planet System Orbiting HIP 57274". The Astrophysical Journal. 745 (1). 21. arXiv:1109.2926. Bibcode:2012ApJ...745...21F. doi:10.1088/0004-637X/745/1/21.
^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
^ "BD+31 2290". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 August 2017.
^ Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal. 129 (3): 1483–1522. arXiv:astro-ph/0412070. Bibcode:2005AJ....129.1483L. doi:10.1086/427854. S2CID 2603568.
^ Kammer, J. A.; et al. (February 2014). "A Spitzer Search for Transits of Radial Velocity Detected Super-Earths". The Astrophysical Journal. 781 (2): 6. arXiv:1310.7952. Bibcode:2014ApJ...781..103K. doi:10.1088/0004-637X/781/2/103. S2CID 37557541. 103.
^ ^a ^b ^c Elser, S.; et al. (2013), "Super Earths and Dynamical Stability of Planetary Systems: First Parallel GPU Simulations Using GENGA", Monthly Notices of the Royal Astronomical Society, 433 (3): 2194–2205, arXiv:1305.4070, Bibcode:2013MNRAS.433.2194E, doi:10.1093/mnras/stt883

Constellation of Ursa Major

Stars

Bayer	α (Dubhe) β (Merak) γ (Phecda) δ (Megrez) ε (Alioth) ζ (Mizar) η (Alkaid) θ ι (Talitha) κ (Alkaphrah) λ (Tania Borealis) μ (Tania Australis) ν (Alula Borealis) ξ (Alula Australis) ο (Muscida) π¹ π² ρ σ¹ σ² τ υ φ χ (Taiyangshou) ψ ω
Flamsteed	2 (A) 5 (b) 6 15 (f) 16 (c) 17 18 (e) 19 20 21 22 23 (h) 24 (d) 26 27 28 31 32 35 36 37 38 39 40 41 42 43 44 46 47 (Chalawan) 49 51 55 56 57 58 59 60 61 62 65 66 67 68 70 71 72 73 74 75 76 78 80 (Alcor) 81 82 83 84 86 55 Cam 56 Cam 57 Cam 1 CVn 14 LMi 15 LMi 25 LMi 47 LMi 37 Lyn 39 Lyn 41 Lyn (Intercrus)
Variable	R T U W Z RV ST SU SW SX TU TX TY UX UY VV VX VY XY ZZ AA AB AE AN AR AW BC BE BM BZ CG CH CO CQ CY DH DI DM DV DW EE EG EI EK EN EP ER ET EU EV EZ IY KS
HR	3922 4067 4098 4132 4867 5148
HD	68988 (Násti) 74389 80606 80607 84406 98618 99706 118203 (Liesma) 233731
Other	ADS 7251 Feige 55 G 196-3 Gliese 338 Gliese 412 Gliese 414 GJ 3512 Groombridge 1618 Groombridge 1830 HAT-P-3 (Dombay) HAT-P-13 HAT-P-21 (Mazaalai) HIP 57050 HIP 57274 1SWASP J093010.78+533859.5 KELT-24 Lalande 21185 M82 X-1 M82 X-2 Qatar-8 Sidus Ludoviciana SN H0pe UGC 5497 US 708 Winnecke 4 WISE 1405+5534 XTE J1118+480

Exoplanets	47 Ursae Majoris b (Taphao Thong) c (Taphao Kaew) d ο Ursae Majoris b 41 Lyncis b (Arkas) Gliese 414 Ab c HAT-P-3b (Teberda) HD 80606 b HD 89744 b KELT-24b

Nebulae	Owl Nebula

Galaxies

Messier	81 (Bode's Galaxy) 82 (Cigar Galaxy) 101 (Pinwheel Galaxy) 108 109
NGC	2603 2606 2681 2685 2688 2768 2787 2800 2805 2814 2841 2857 2950 2959 2976 2985 2998 3005 3006 3008 3009 3073 3077 3079 3184 3191 3198 3206 3259 3310 3319 3353 3359 3435 3445 3448 3516 3539 3545B 3550 3552 3553 3554 3358 3561 3583 3610 3613 3619 3631 3642 3656 3665 3669 3675 3690 3718 3726 3729 3738 3741 3786 3794 3877 3893 3898 3921 3928 3938 3941 3945 3949 3953 3972 3982 3985 3994 3995 3998 4013 4026 4036 4041 4051 4088 4096 4100 4102 4144 4157 4194 4500 4605 5001 5164 5201 5204 5256 5278 5279 5308 5322 5422 5473 5474 5477 5486 5502 5585
Other	2MASX J10222849+5006200 3C 219 3C 244.1 3C 268.3 CEERS-2112 Haro 2 Holmberg IX I Zwicky 18 IC 923 IC 2574 IRAS F11119+3257 Markarian 231 Markarian 273 Markarian 421 Mayall's Object SBS 0953+549 SDSS J1148+5251 UGC 4879 UGC 5101 UGC 6945 UGC 8335 UGC 8508 Ursa Major III