HD 65810 is a solitary, main‑sequence star of spectral type A1 V located in the southern celestial hemisphere. It is listed in several stellar catalogs, most notably the Henry Dickens (HD) catalog, the Harvard Revised (HR) catalog, and the Hipparcos catalog. The star is visible to the naked eye with an apparent visual magnitude of 4.61.
Identifiers
- HD 65810 (Henry Dickens catalog)
- HR 3131 (Harvard Revised catalog)
- HIP 39095 (Hipparcos catalog)
- SAO 153687, BD‑18 2118, BD‑18 2118, SAO 153687, and numerous other designations (e.g., 2MASS J07595205‑1823573, Gaia DR3 5714859436545926016).
Astrometric data
- Equatorial coordinates (J2000): Right Ascension 07 h 59 m 52.04756 s, Declination −18° 23′ 57.1809″.
- Galactic coordinates: ℓ = 237.164°, b = +5.998°.
- Proper motion: +6.455 mas yr⁻¹ in right ascension, −43.718 mas yr⁻¹ in declination (epoch J2000).
- Parallax: 14.5984 ± 0.2077 mas (Gaia DR2/DR3).
- Corresponding distance ≈ 68.5 pc (≈ 223 light‑years).
- Radial velocity: −9.8 ± 0.63 km s⁻¹ (heliocentric).
Photometric data (magnitudes in the Johnson–Cousins system)
- U = 4.77 (uncertainty not specified).
- B = 4.69.
- V = 4.61.
- R = 4.46.
- I = 4.40.
- J = 4.40, H = 4.33, K = 4.309 (near‑infrared).
Spectral classification
- Spectral type A1 V (main‑sequence star). The classification indicates a white star with an effective temperature of roughly 9,300 K, typical of early‑A dwarfs.
Physical characteristics
- Absolute visual magnitude (M_V): Using the distance modulus $M_V = V - 5\log_{10}(d/10,\text{pc})$ with $V = 4.61$ and $d ≈ 68.5$ pc yields $M_V ≈ 0.5$.
- Luminosity: An A1 V star of this absolute magnitude is roughly 50–60 times more luminous than the Sun.
- Mass and radius: Typical A1 V stars possess masses of 2.2–2.5 M☉ and radii of about 2 R☉, though precise values for HD 65810 require detailed spectroscopic modelling not provided in the catalog data.
Catalog references
All astrometric and photometric values are drawn from the SIMBAD astronomical database (accessed 2026‑04‑13), which aggregates measurements from the Hipparcos and Gaia missions, the Johnson photometric system, and peer‑reviewed literature.
Notes
HD 65810 does not have any known companions, variability, or peculiar chemical abundances reported in the literature. Its relatively bright magnitude and proximity make it a useful reference point for calibration of photometric and astrometric instruments.