HD 162337

HD 162337, also known as HR 6646 or rarely 65 G. Apodis, is a solitary orange-hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.35,^[2] placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively far at a distance of 989 light-years based on Gaia DR3 parallax measurements,^[1] but it is drifting closer with a heliocentric radial velocity of −3.3 km/s.^[5] At its current distance, HD 162337's brightness is heavily diminished by 0.45 magnitudes due to interstellar extinction^[13] and it has an absolute magnitude of −0.61.^[6]

HD 162337

Location of HD 162337 on the map (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Apus
Right ascension	18h 05m 26.85525s[1]
Declination	−81° 29′ 11.6368″[1]
Apparent magnitude (V)	6.35±0.01[2]
Characteristics
Spectral type	K3/4 III[3]
U−B color index	+1.75[4]
B−V color index	+1.50[4]
Astrometry
Radial velocity (Rv)	−3.3±0.4[5] km/s
Proper motion (μ)	RA: +28.344 mas/yr[1] Dec.: −48.347 mas/yr[1]
Parallax (π)	3.2987±0.0286 mas[1]
Distance	989 ± 9 ly (303 ± 3 pc)
Absolute magnitude (MV)	−0.61[6]
Details
Radius	42.0+4.2 −4.1[7] or 67.8±1.6[1] R☉
Luminosity	495±13[7] or 1,055+28 −27[1] L☉
Surface gravity (log g)	0.71±0.01[8] cgs
Temperature	4,186±122[9] K
Metallicity [Fe/H]	−0.66[8] dex
Rotational velocity (v sin i)	<1.0[10] km/s
Other designations
65 G. Apodis[11], CD−81°673, CPD−81°799, FK5 3990, GC 24431, HD 162337, HIP 88599, HR 6646, SAO 258787[12]
Database references
SIMBAD	data

HD 162337 has a stellar classification of K3/4 III,^[3] indicating that it is an evolved star with the characteristics of a K3 and K4 giant star. It has expanded to 42 times the radius of the Sun^[7] and now radiates 495 times the luminosity of the Sun^[7] from its enlarged photosphere at an effective temperature of 4,186 K.^[9] However, Gaia DR3 stellar evolution models give a larger radius of 67.8±1.6 R_☉^[1] and a higher luminosity of 1,055+28
−27 L_☉.^[1] HD 162337 is metal deficient with an iron abundance 21.9% that of the Sun's ([Fe/H] = −0.66)^[8] and it spins too slowly for its projected rotational velocity to measured accurately.^[10]