Gliese 49

Gliese 49
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 01h 02m 38.86799s[1]
Declination +62° 20′ 42.1728″[1]
Apparent magnitude (V) 9.56±0.02[2]
Characteristics
Spectral type M1.5 V[2]
B−V color index 1.463±0.032[3]
Astrometry
Radial velocity (Rv)−5.974±0.0011[1] km/s
Proper motion (μ) RA: +731.135[1] mas/yr
Dec.: +90.690[1] mas/yr
Parallax (π)101.4238 ± 0.0169 mas[4]
Distance32.158 ± 0.005 ly
(9.860 ± 0.002 pc)
Absolute magnitude (MV)9.55[3]
Details[2]
Mass0.515±0.019 M☉
Radius0.511±0.018 R☉
Luminosity (bolometric)0.04938±0.00090 L☉
Surface gravity (log g)4.69±0.07 cgs
Temperature3,805±51 K
Metallicity [Fe/H]+0.13±0.16 dex
Rotation18.86+0.10
−0.09 d
Rotational velocity (v sin i)<2 km/s
Other designations
BD+61°195, GJ 49, HIP 4872, LTT 10363[5]
Database references
SIMBADdata

Gliese 49 is a star in the northern constellation of Cassiopeia. Visually, it is located 106 arcminutes north of the bright star γ Cassiopeiae. With an apparent visual magnitude of 9.56,[2] it is not observable with the naked eye. It is located, based on the reduction of parallax data of Gaia (101.47±0.03 mas), 32.1 light-years away from the Solar System. The star is drifting closer to the Sun with a radial velocity of −6 km/s.[1]

This object is a red dwarf star of spectral type M1.5V.[2] Much dimmer than the Sun, it has a total luminosity that is 4.9% that of the Sun;[2][6] it is, however, much brighter than other nearby red dwarfs such as Proxima Centauri or Wolf 359. It has an effective temperature of 3,805±51 K. Its mass is 52% that of the Sun, and 51% of its radius.[2]

It rotates on its axis with a projected rotation speed of under 2 km/s, and has a rotation period of 18.86 days. It has a metallic content similar to that of the Sun, with its index of metallicity [M / H] = +0.03.[7] Although its age is not known exactly, it is younger than 250 million years.[citation needed]

Gliese 49 has a similar proper motion to the red dwarf flare star V388 Cassiopeiae. The visual separation between the two is 295 arcseconds, which implies that the real distance between them is over 2,900 AU. Both stars are associated with the Hyades, as suggested by its young age and chromospheric activity levels.[8]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Perger2019 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Morales2008 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Houdebine2010 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Makarov was invoked but never defined (see the help page).