| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Antlia |
| Right ascension | 10h42m 43.1844s[1] |
| Declination | −32° 42′ 56.413″[1] |
| Apparent magnitude (V) | 5.62±0.01[2] |
| Characteristics | |
| Evolutionary stage | subgiant[3] |
| Spectral type | A0 V[4] |
| B−V color index | +0.00[5] |
| Astrometry | |
| Radial velocity (Rv) | 4.5±0.5[6] km/s |
| Proper motion (μ) | RA: −28.903 mas/yr[1] Dec.: +1.262 mas/yr[1] |
| Parallax (π) | 4.1113 ± 0.2655 mas[1] |
| Distance | 790 ± 50 ly (240 ± 20 pc) |
| Absolute magnitude (MV) | −0.67[7] |
| Details | |
| Mass | 3.1±0.1[3] M☉ |
| Radius | 5.31[8] R☉ |
| Luminosity | 206+72 −53[3] L☉ |
| Surface gravity (log g) | 3.5[9] cgs |
| Temperature | 9,376±109[8] K |
| Metallicity [Fe/H] | 0.00[10] dex |
| Rotational velocity (v sin i) | 81±3[11] km/s |
| Age | 282±34[12] Myr |
| Other designations | |
78 G. Antilae[13], CD−32°7572, CPD−32°2953, FK5 1277, GC 14732, HIP 52407, HR 4194, SAO 201665, WDS J10427-3243A[14] | |
| Database references | |
| SIMBAD | data |
HD 92845 (HR 4194) is a probable astrometric binary[15] in the southern constellation Antlia. It has an apparent magnitude of 5.62, allowing it to be faintly seen with the naked eye. Parallax measurements place the system at a distance of 790 light years and it is currently receding with a heliocentric radial velocityof4.5 km/s.
HD 92845 has a stellar classification of A0 V,[4] indicating that it is an ordinary A-type main-sequence star. However, stellar evolution models from Zorec and Royer reveal it to be a subgiant that has just left the main sequence.[3] It has 3.1 times the mass of the Sun[3] but has expanded to an enlarged radiusof5.31 R☉.[8] It radiates with a luminosity 206 times greater than the Sun[3] from its photosphere at an effective temperatureof9,376 K,[8] giving a white hue. At an age of 282 million years,[12] HD 92845 spins quickly with a projected rotational velocityof81 km/s.[11]
There is an optical companion 17″ away along a position angleof214° as of 1999.[16]
