24 Ursae Majoris

This article is about d Ursae Majoris. Not to be confused with δ Ursae Majoris.
24 Ursae Majoris

A light curve for DK Ursae Majoris, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 09h 34m 28.86175s[2]
Declination +69° 49′ 49.2265″[2]
Apparent magnitude (V) 4.54[3]
Characteristics
Spectral type G4 III-IV[4]
B−V color index 0.781±0.011[3]
Variable type RS CVn[5]
Astrometry
Radial velocity (Rv)−27.0±0.2[3] km/s
Proper motion (μ) RA: −64.785[2] mas/yr
Dec.: +77.214[2] mas/yr
Parallax (π)30.9269 ± 0.1621 mas[2]
Distance105.5 ± 0.6 ly
(32.3 ± 0.2 pc)
Absolute magnitude (MV)2.16±0.013[6]
Details
Mass1.9[7] M☉
Radius4.6[7] R☉
Luminosity14.9[7] L☉
Surface gravity (log g)3.44[6] cgs
Temperature5,335[6] K
Metallicity [Fe/H]−0.19[6] dex
Rotation10 d[7]
Rotational velocity (v sin i)5.5[8] km/s
Age1.0±0.1[9] Gyr
Other designations
d UMa, 24 UMa, DK UMa, BD+70°565, FK5 357, HD 82210, HIP 46977, HR 3771, SAO 6897[10]
Database references
SIMBADdata

24 Ursae Majoris is a variable star in the northern circumpolar constellation of Ursa Major, located 101.5 light-years from the Sun.[2] It has the variable star designation DK Ursae Majoris and the Bayer designation d Ursae Majoris; 24 Ursae Majoris is the Flamsteed designation. This object is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.54.[3] It is moving closer to the Earth with a heliocentric radial velocity of −27 km/s, and is expected to come as close as 51 light-years in around 879,000 years.[failed verification][3]

  1. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference park2013 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Gondoin2005 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Ayres2007 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Pace2013 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).