HD 106248

HD 106248
Location of HD 106248 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 12h 13m 56.46291s[1]
Declination −78° 34′ 26.1715″[1]
Apparent magnitude (V) 6.34±0.01[2]
Characteristics
Spectral type K2/3 III CNII[3]
U−B color index +1.41[4]
B−V color index +1.21[4]
Astrometry
Radial velocity (Rv)34.5±0.4[5] km/s
Proper motion (μ) RA: −4.318 mas/yr[1]
Dec.: −20.594 mas/yr[1]
Parallax (π)9.1183 ± 0.0194 mas[1]
Distance357.7 ± 0.8 ly
(109.7 ± 0.2 pc)
Absolute magnitude (MV)+1.10[6]
Details
Mass1.19±0.82[7] M☉
Radius10.93[8] R☉
Luminosity49+2.3
−2.2[7] L☉
Surface gravity (log g)2.42[9] cgs
Temperature4,700±122[10] K
Metallicity [Fe/H]+0.05[9] dex
Rotational velocity (v sin i)<1.5[11] km/s
Age4.31+0.75
−0.48[1] Gyr
Other designations
39 G. Chamaeleontis[12], CD−77°542, CPD−77°804, GC 16698, HD 106248, HIP 59647, HR 4649, SAO 256915[13]
Database references
SIMBADdata

HD 106248, also known as HR 4649, is a solitary, orange hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.34,[2] placing it near the limit for naked eye visibility. Based on parallax measurements from Gaia DR3, the object is estimated to be 358 light years away from the Solar System.[1] It appears to be receding with a heliocentric radial velocity of 34.5 km/s.[5] At its current distance, HD 106248's brightness is diminished by 0.32 due to interstellar dust and Eggen (1993) lists it as a member of the old (thick) disk population.[14]

This is an evolved red giant with a stellar classification of K2/3 III CNII[3]—intermediate between a K2 and K3 giant star. The CNII suffix indicates that it has a strong overabundance of cyano radicals in its spectrum, making it a CN star.[15] It has 119% the mass of the Sun[7] and is estimated to be 4.31 billion years old,[1] slightly younger than the Sun. However, HD 106248 has already left the main sequence and has an enlarged radius of 10.9 R☉.[8] It radiates 49 times the luminosity of the Sun from its photosphere[7] at an effective temperature of 4,700 K.[10] The star has a solar metallicity and spins slowly with a projected rotational velocity lower than 1.5 km/s.[11]

  1. ^ a b c d e f g Cite error: The named reference GaiaDR3 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 Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 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 Charbonnel2020 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Eggen1993 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Janes1971 was invoked but never defined (see the help page).