HJ 4093
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Puppis |
| HD 71487 | |
| Right ascension | 08h 26m 17.7301s |
| Declination | −39° 03′ 32.258″ |
| Apparent magnitude (V) | 6.49±0.01 (6.588 + 8.96) primary eclipse: 6.98 secondary ecl.: 6.66 |
| HD 71488 | |
| Right ascension | 08h 26m 18.3057s |
| Declination | −39° 03′ 36.747″ |
| Apparent magnitude (V) | 7.40 (7.900 + 8.10) |
| Characteristics | |
| HD 71487 | |
| Evolutionary stage | Main sequence |
| Spectral type | B9V + A7V |
| B−V color index | −0.11 |
| Variable type | Eclipsing binary |
| HD 71488 | |
| Evolutionary stage | Main sequence |
| Spectral type | A5V + A6V |
| B−V color index | +0.30 |
| Astrometry | |
| HD 71487 | |
| Radial velocity (Rv) | +25.4±0.6 km/s |
| Proper motion (μ) | RA: −7.896 mas/yr Dec.: +5.975 mas/yr |
| Parallax (π) | 5.7991±0.0304 mas |
| Distance | 562 ± 3 ly (172.4 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.258±0.409 |
| HD 71488 | |
| Proper motion (μ) | RA: −6.1±2.0 mas/yr Dec.: +10.4±2.9 mas/yr |
| Position (relative to HD 71487) | |
| Component | HD 71488 |
| Epoch of observation | 2015 |
| Angular distance | 8.1″ |
| Position angle | 124° |
| Orbit | |
| Primary | HD 71487 A |
| Name | HD 71487 B |
| Period (P) | 1.2569956(9) days |
| Semi-major axis (a) | 0.03956±0.00023 au (8.51±0.05 R☉) |
| Eccentricity (e) | 0.127±0.027 |
| Inclination (i) | 81.33±0.20° |
| Semi-amplitude (K1) (primary) | 109.9±0.9 km/s |
| Semi-amplitude (K2) (secondary) | 232.1±1.5 km/s |
| Orbit | |
| Primary | HD 71488 A |
| Name | HD 71488 B |
| Period (P) | 101.3±3.8 years |
| Semi-major axis (a) | 0.179±0.012" (34.4 au) |
| Eccentricity (e) | 0.054±0.041 |
| Inclination (i) | 155±13° |
| Longitude of the node (Ω) | 47±71° |
| Periastron epoch (T) | 1976.23±13.06 |
| Argument of periastron (ω) (secondary) | 318±74° |
| Details | |
| HD 71487 A | |
| Mass | 3.58±0.11 M☉ |
| Radius | 2.17±0.03 R☉ |
| Luminosity | 133±24 L☉ |
| Surface gravity (log g) | 4.3±0.1 cgs |
| Temperature | 13,300±500 K |
| Metallicity [Fe/H] | −0.02±0.01 dex |
| Rotation | 1.32 days |
| Rotational velocity (v sin i) | 65±5 km/s |
| Age | 20 Myr |
| HD 71487 B | |
| Mass | 1.68±0.09 M☉ |
| Radius | 1.51±0.06 R☉ |
| Luminosity | 6.2±2.2 L☉ |
| Surface gravity (log g) | 4.2±0.1 cgs |
| Temperature | 7,400±500 K |
| Metallicity [Fe/H] | −0.08±0.03 dex |
| Rotational velocity (v sin i) | 64±2 km/s |
| Age | 20 Myr |
| HD 71488 A | |
| Mass | 2.0 M☉ |
| Age | 20 Myr |
| HD 71488 B | |
| Mass | 1.8 M☉ |
| Age | 20 Myr |
| Other designations | |
| HJ 4093, B 1605, CD−38°4462, HIP 41361, CCDM J08263-3904, WDS J08263-3904 | |
| HD 71487: NO Puppis, HR 3327, SAO 199222, TYC 7661-4332-1 | |
| HD 71488: HR 3328, SAO 199224, TYC 7661-4332-2 | |
| Database references | |
| SIMBAD | HD 71487 |
| HD 71488 | |
HJ 4093 (WDS J08263-3904) is a star system in the constellation Puppis. It comprises HD 71487 and HD 71488, which together form a visual binary and are themselves close binary systems, making HJ 4093 a four-star system. They are separated by about 1,400 astronomical units, having an estimated orbital period in the order of 10,000 years. The combined apparent magnitude is 6.07, making the system (faintly) visible to the naked eye only in ideal conditions, within places far from light pollution.
Parallax measurements by the Gaia spacecraft place HJ 4093 at a distance of 172±1 parsecs (562±3 light-years). The system is very young, at 20 million years old, and is part of an unnamed stellar association.