HD 194953

HD 194953
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 28m 16.7824s[1]
Declination +02° 56′ 14.0305″[1]
Apparent magnitude (V) 6.19±0.01[2]
Characteristics
Spectral type G8 III/IV[3]
U−B color index +0.56[4]
B−V color index +0.90[4]
Astrometry
Radial velocity (Rv)−28±0.4[5] km/s
Proper motion (μ) RA: +50.801 mas/yr[1]
Dec.: −5.249 mas/yr[1]
Parallax (π)7.8706 ± 0.1437 mas[1]
Distance414 ± 8 ly
(127 ± 2 pc)
Absolute magnitude (MV)+0.74[6]
Details
Mass2.38[7] M☉
Radius10.22[8] R☉
Luminosity53.7[9] L☉
Surface gravity (log g)2.88[10] cgs
Temperature5,101±122[8] K
Metallicity [Fe/H]−0.11[10] dex
Rotational velocity (v sin i)2.4±1.2[11] km/s
Age640[7] Myr
Other designations
6 G. Delphini, AG+02°2586, BD+02°4175, GC 28470, HD 194953, HIP 100969, HR 7824, SAO 125843[12][13]
Database references
SIMBADdata

HD 194953 (HR 7824) is a solitary star in the equatorial constellation Delphinus. It is faintly visible to the naked eye with an apparent magnitude of 6.19[2] and is located 414 light years away.[1] However, it is approaching the Solar System with a heliocentric radial velocity of −28 km/s.[5]

HD 194953 has a stellar classification of G8 III/IV[3] — a blended luminosity class of a subgiant and giant. It has 2.38 times the mass of the Sun[7] and an enlarged radius of 10.2 R☉[8] at an age of 640 million years.[7] It radiates at 54 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 5,101 K,[8] giving a yellow hue. HD 194953 is slightly metal deficient with an iron abundance 78% that of the Sun[10] and spins leisurely with a projected rotational velocity of about 2.4 km/s.[11]

  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 Houk1999 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cousins1964 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Bertelli1994 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Liu2014 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference deMed1999 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).