HD 68988

HD 68988 / Násti
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 08h 18m 22.1727s[1]
Declination +61° 27′ 38.5973″[1]
Apparent magnitude (V) 8.20[2]
Characteristics
Spectral type G0V[3] or G2V[4] or G2IV[2]
B−V color index 0.652±0.015[2]
Astrometry
Radial velocity (Rv)−69.45±0.11[2] km/s
Proper motion (μ) RA: 128.329±0.073[1] mas/yr
Dec.: 30.270±0.059[1] mas/yr
Parallax (π)16.4066 ± 0.0513 mas[1]
Distance198.8 ± 0.6 ly
(61.0 ± 0.2 pc)
Absolute magnitude (MV)4.52[2]
Details[5]
Mass1.16±0.01 M☉
Radius1.08±0.01 R☉
Luminosity1.297±0.002 L☉
Surface gravity (log g)4.42±0.01 cgs
Temperature5919±11 K
Metallicity [Fe/H]0.29±0.01[2] dex
Rotational velocity (v sin i)6.4[6] km/s
Age1.0±0.4 Gyr
Other designations
BD+61°1038, HD 68988, HIP 40687, SAO 14494[7]
Database references
SIMBADdata

HD 68988 is a star in the northern constellation of Ursa Major. It has been given the proper name Násti, which means star in the Northern Sami language. The name was selected in the NameExoWorlds campaign by Norway, during the 100th anniversary of the IAU.[8][9] HD 68988 is too faint to be seen with the naked eye, having an apparent visual magnitude of 8.20.[2] The star is located at a distance of 199 light years from the Sun based on parallax. It is drifting closer with a radial velocity of −69 km/s and is predicted to come as close as 78 light-years in 617,000 years.[2]

The stellar classification of HD 68988 has been given as G0V,[3] G2V,[4] and G2IV.[2] The age of this star was estimated as six billion years in 2002,[4] but was later revised down to one billion years in 2015.[5] It is rotating slowly and is chromospherically inactive.[10] The star has 16% more mass than the Sun and an 8% greater radius with a high metallicity; what astronomers term the abundance of heavier elements. It is radiating 1.3 times the luminosity of the Sun from its photosphere at an effective temperature of 5,919 K.[5]

  1. ^ a b c d e Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference van Belle2009 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Vogt2002 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Bonfanti2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Earle2017 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference nameexoworlds was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference IAU was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Butler2006 was invoked but never defined (see the help page).