HIP 57050

HIP 57050
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major[1]
Right ascension 11h 41m 44.63584s[2]
Declination +42° 45′ 07.1021″[2]
Apparent magnitude (V) 11.86[1]
Characteristics
Spectral type M4.0V[3]
U−B color index +1.52[4]
B−V color index +1.503±0.012[1]
V−R color index +1.19[4]
Astrometry
Radial velocity (Rv)−8.99±0.0014[5] km/s
Proper motion (μ) RA: −575.528(26) mas/yr[2]
Dec.: −89.799(25) mas/yr[2]
Parallax (π)90.6896 ± 0.0258 mas[2]
Distance35.96 ± 0.01 ly
(11.027 ± 0.003 pc)
Absolute magnitude (MV)11.64[1]
Details
Mass0.357±0.013[6] M☉
Radius0.4[7] R☉
Luminosity0.01486[7] L☉
Surface gravity (log g)4.67[7] cgs
Temperature3,236±18[5] K
Metallicity [Fe/H]0.32±0.06[7] dex
Rotation71.5±5.1 d[8]
Rotational velocity (v sin i)2.0[5] km/s
Age4.44±0.016[9] Gyr
Other designations
Gaia DR2 772430527947893632, GJ 1148, HIP 57050, G 122-40, LHS 2443, LTT 13210, Ross 1003, 2MASS J11414471+4245072[10]
Database references
SIMBADdata
ARICNSdata

HIP 57050, or GJ 1148, is a faint star with two orbiting exoplanets in the northern constellation of Ursa Major. Other designations for this star include LHS 2443, G 122-40, and Ross 1003.[10] From a distance of 36 light years based on parallax measurements, it is drifting closer to the Sun with a radial velocity of -9 km/s.[2] This is a faint star with an absolute magnitude of 11.64.[1] At the distance of HIP 57050, the apparent visual magnitude is 11.86,[1] which is much too faint to be seen with the naked eye. HD 164595 has a high proper motion, traversing the celestial sphere at an angular rate of 0.577″ yr−1.[11]

The spectrum of HIP 57050 matches a small M-type main-sequence star, a red dwarf, with a stellar classification of M4.0V.[3] HIP 57050 has a metallicity twice that of the Sun and is among the highest in the immediate solar neighborhood.[7] It has a quiet chromosphere that displays little magnetic activity. A minimal level of amplitude variation from rotation suggests the star may be viewed from nearly pole-on.[8] This star has 36%[6] of the Sun's mass and 40% of the radius of the Sun. It is radiating just 1.5%[7] of the luminosity of the Sun from its photosphere at an effective temperature of 3,236 K.[5]

  1. ^ a b c d e f Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Lépine_et_al_2013 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference ARICNS was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Fouqué_et_al_2018 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Trifonov2018 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference HIP57050bpublication was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Moutou2023 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Gaidos_et_al_2023 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Simbad was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Lepine_Shara_2005 was invoked but never defined (see the help page).