HD 36780

HD 36780
Location of HD 36780 (circled) in the Orion's Belt region
Credit: Martin Mutti
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 34m 04.04714s[1]
Declination −01° 28′ 12.8681″[1]
Apparent magnitude (V) +5.92[2]
Characteristics
Evolutionary stage giant
Spectral type K4 III[3]
U−B color index +1.87[4]
B−V color index +1.535±0.008[2]
Astrometry
Radial velocity (Rv)83.80±0.30[1] km/s
Proper motion (μ) RA: −7.904[1] mas/yr
Dec.: −31.852[1] mas/yr
Parallax (π)6.1048 ± 0.1096 mas[1]
Distance534 ± 10 ly
(164 ± 3 pc)
Absolute magnitude (MV)−0.65[2]
Details
Radius30.8+2.1
−4.2[1] R☉
Luminosity243.3±5.2[1] L☉
Temperature4,108+315
−135 K
Other designations
BD–01°950, GC 6894, HD 36780, HIP 26108, HR 1874, SAO 132270[5]
Database references
SIMBADdata

HD 36780 is a star located in Orion's belt, within the equatorial constellation of Orion. It has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.92.[2] The distance to this object is approximately 534 light years based on parallax.[1] It is drifting away from the Sun with a radial velocity of 84 km/s,[1] having come to within 185.6 light-years some 2.1 million years ago.[2]

This is an aging giant star with a stellar classification of K4 III.[3] After exhausting the supply of hydrogen at its core, the star cooled and expanded off the main sequence. At present it has around 31 times the girth of the Sun. It is radiating 243 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,108 K.[1]

  1. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference HD was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference UBVRI was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).