HD 33541
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 05h 18m 13.24213s[2] |
| Declination | +73° 16′ 05.1509″[2] |
| Apparent magnitude (V) | 5.83±0.01[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A0 V[4] |
| U−B color index | −0.12[3] |
| B−V color index | −0.04[3] |
| Astrometry | |
| Radial velocity (Rv) | 9.9±3.2[5] km/s |
| Proper motion (μ) | RA: −2.361 mas/yr[2] Dec.: −28.254 mas/yr[2] |
| Parallax (π) | 9.0993±0.0488 mas[2] |
| Distance | 358 ± 2 ly (109.9 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.58[1] |
| Orbit[6] | |
| Primary | HD 33541A |
| Companion | HD 33541B |
| Period (P) | 20.8199180±0.0000458 d |
| Eccentricity (e) | 0.245±0.006 |
| Periastron epoch (T) | 2,457,388.471+0.002 −0.003 JD |
| Argument of periastron (ω) (secondary) | 108±1° |
| Semi-amplitude (K1) (primary) | 39.3±0.3 km/s |
| Semi-amplitude (K2) (secondary) | 38.0±0.3 km/s |
| Details | |
| Mass | 2.69±0.35[7] M☉ |
| Radius | 2.52±0.13[8] R☉ |
| Luminosity | 69.3±0.9[2] L☉ |
| Surface gravity (log g) | 4.09+0.07 −0.05[7] cgs |
| Temperature | 11,200[9] K |
| Metallicity [Fe/H] | −0.15[10] dex |
| Rotational velocity (v sin i) | 70[11] km/s |
| Age | 300[12] Myr |
| Other designations | |
| AG+73°141, BD+73°280, GC 6405, HD 33541, HIP 24732, HR 1683, SAO 5483[13] | |
| Database references | |
| SIMBAD | data |
HD 33541, also known as HR 1683, is a white-hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.83,[3] making it faintly visible to the naked eye. Gaia DR3 parallax measurements imply a distance of 358 light years[2] and it is currently receding with a heliocentric radial velocity of 9.9 km/s.[5] At its current distance HD 33541's brightness is diminished by 0.16 magnitudes due to interstellar extinction[14] and it has an absolute magnitude of +0.58.[1]
The object has a stellar classification of A0 V,[4] indicating that it is an ordinary A-type main-sequence star. It has 2.69 times the mass of the Sun[7] and 2.52 times the Sun's radius.[8] It radiates 69.3 times the luminosity of the Sun[2] from its photosphere at an effective temperature of 11,200 K.[9] HD 33541 has an iron abundance 71% that of the Sun ([Fe/H] = −0.15)[10] and it is estimated to be 300 million years old.[12] The star spins modestly with a projected rotational velocity of 70 km/s.[11]
HD 33541 was originally considered to be a solitary star.[15] However, Abt & Morell (1995) suggested that HD 33541 may be a close binary with two components that each have rotational velocities of 10 km/s.[16] A later paper gives the rotational velocity of the primary as 60 km/s and of the secondary 11 km/s.[17] It is now considered to be a spectroscopic binary with a period of 20.8 hours and a somewhat eccentric orbit based on Gaia DR3 models.[6]
