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] |
Distance | 501 ± 9 ly (154 ± 3 pc) |
Absolute magnitude (MV) | −0.4[8] |
Details | |
Mass | 1.21[9] M☉ |
Radius | 52.43[10] R☉ |
Luminosity | 392[11] L☉ |
Surface gravity (log g) | 1.31[9] cgs |
Temperature | 3,969±122[12] K |
Metallicity [Fe/H] | +0.14[9] dex |
Other designations | |
Database references | |
SIMBAD | data |
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]