HD 40091

HD 40091

A light curve for HD 40091, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 54m 52.48300s[2]
Declination −39° 57′ 28.2946″[2]
Apparent magnitude (V) 5.54±0.01[3]
Characteristics
Spectral type M0 III[4]
U−B color index +1.85[5]
B−V color index +1.51[5]
Variable type suspected[6]
Astrometry
Radial velocity (Rv)114±2[7] km/s
Proper motion (μ) RA: −11.977 mas/yr[2]
Dec.: +21.203 mas/yr[2]
Parallax (π)6.5078 ± 0.1112 mas[2]
Distance501 ± 9 ly
(154 ± 3 pc)
Absolute magnitude (MV)−0.4[8]
Details
Mass1.21[9] M☉
Radius52.43[10] R☉
Luminosity392[11] L☉
Surface gravity (log g)1.31[9] cgs
Temperature3,969±122[12] K
Metallicity [Fe/H]+0.14[9] dex
Other designations
60 G. Columbae[13], NSV 16734, CD−39°2260, CPD−39°789, FK5 2449, GC 7471, HD 40091, HIP 27955, HR 2082, SAO 196309[14]
Database references
SIMBADdata

HD 40091, also known as HR 2082, is a solitary star[15] located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.54,[3] making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 501 light years distant.[2] However, it is rapidly receding with a high heliocentric radial velocity of 114 km/s.[7]

This is an evolved red giant with a stellar classification of M0 III.[4] It has 121% the mass of the Sun[9] but has expanded to 52.43 times its girth.[10] It radiates 392 times the luminosity of the Sun[11] from its enlarged photosphere at an effective temperature of 3,969 K,[12] giving it a red hue. HD 40091 is slightly metal enriched, having an iron abundance 38% above solar levels. [9]

HD 40091 is found to vary between 5.64 and 5.68 in the Hipparcos passband, but it is not confirmed to be a variable star. Therefore, it is catalogued in the GCVS as a suspected variable.[6]

  1. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1982 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Oja1970 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 Gontcharov2006 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. ^ a b c d e Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Stassun2019 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).
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).