HD 200044

HD 200044
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 21h 00m 27.6883s[1]
Declination +19° 19′ 46.493″[1]
Apparent magnitude (V) 5.70±0.01[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M3 IIIab[4]
B−V color index +1.61[5]
Variable type suspected[6]
Astrometry
Radial velocity (Rv)−15.07±0.09[7] km/s
Proper motion (μ) RA: −15.483 mas/yr[1]
Dec.: −59.705 mas/yr[1]
Parallax (π)5.455 ± 0.0753 mas[1]
Distance598 ± 8 ly
(183 ± 3 pc)
Absolute magnitude (MV)−0.33[8]
Details
Mass1.32[9] M☉
Radius58[10] R☉
Luminosity507[11] L☉
Surface gravity (log g)0.93[12] cgs
Temperature3,707[10] K
Other designations
AG+19°2128, BD+18°4675, GC 29329, HD 200044, HIP 103675, HR 8044, SAO 106747, WDS J21005+1920A
Database references
SIMBADdata

HD 200044 (HR 8044) is a solitary[13] star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.7,[2] allowing it to be faintly seen with the naked eye. The object is located 598 light years away,[1] but is approaching the Solar System with a heliocentric radial velocity of −15.07 km/s.[7]

HD 200044 has a spectral classification of M3 IIIab,[4] indicating that its an ageing red giant. It is currently on the asymptotic giant branch and is fusing hydrogen and helium in shells around an inert carbon core.[3] As a consequence, it has expanded to 58 times the radius of the Sun and is now radiating with a luminosity over 500 times greater than that of the Sun. HD 200044's large size and high luminosity yield an effective temperature of 3,707 K, giving it a red glow. HD 200044 is suspected to be a variable star with an amplitude of 0.05 magnitudes.[6]

There is a 10th magnitude optical companion separated 49.3″ away and at a position angle of 337° as of 2014. However, the separation is increasing due to HD 200044's high proper motion.[14]

  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Yamashita1967 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Haggkvist1970 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Famaey2009 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference kervella2022 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference dr2 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Eggelton2008 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).