HD 53680, HD 53705, and HD 53706
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Puppis |
| HD 53705 | |
| Right ascension | 07h 03m 57.315s |
| Declination | −43° 36′ 28.93″ |
| Apparent magnitude (V) | 5.559±0.003 |
| HD 53706 | |
| Right ascension | 07h 03m 58.921s |
| Declination | −43° 36′ 40.87″ |
| Apparent magnitude (V) | 6.859±0.003 |
| HD 53680 | |
| Right ascension | 07h 03m 50.214s |
| Declination | −43° 33′ 41.41″ |
| Apparent magnitude (V) | 8.686 |
| Characteristics | |
| HD 53705 | |
| Evolutionary stage | main sequence |
| Spectral type | G1.5V |
| B−V color index | 0.624±0.009 |
| HD 53706 | |
| Evolutionary stage | main sequence |
| Spectral type | K0.5V |
| B−V color index | 0.779±0.020 |
| HD 53680 | |
| Spectral type | K6V |
| B−V color index | 1.180±0.012 |
| Astrometry | |
| HD 53705 | |
| Radial velocity (Rv) | +88.81±0.12 km/s |
| Proper motion (μ) | RA: −105.047 mas/yr Dec.: +389.833 mas/yr |
| Parallax (π) | 58.6192±0.0477 mas |
| Distance | 55.64 ± 0.05 ly (17.06 ± 0.01 pc) |
| Absolute magnitude (MV) | +4.47 |
| HD 53706 | |
| Radial velocity (Rv) | +88.55±0.12 km/s |
| Proper motion (μ) | RA: −101.722 mas/yr Dec.: +382.507 mas/yr |
| Parallax (π) | 58.6173±0.0126 mas |
| Distance | 55.64 ± 0.01 ly (17.060 ± 0.004 pc) |
| Absolute magnitude (MV) | +5.99 |
| HD 53680 | |
| Radial velocity (Rv) | +89.065±0.005 km/s |
| Proper motion (μ) | RA: −91.391 mas/yr Dec.: +434.521 mas/yr |
| Parallax (π) | 57.7938±0.3355 mas |
| Distance | 56.4 ± 0.3 ly (17.3 ± 0.1 pc) |
| Absolute magnitude (MV) | 7.81±0.03 |
| Orbit | |
| Primary | HD 53680 A |
| Name | HD 53680 B |
| Period (P) | 1,685.2+0.37 −0.38 days |
| Semi-major axis (a) | 2.53±0.02 AU |
| Eccentricity (e) | 0.485±0.002 |
| Inclination (i) | 163.6+1.4 −1.7° |
| Longitude of the node (Ω) | 147.86+0.06 −0.08° |
| Argument of periastron (ω) (secondary) | 226.17+0.13 −0.17° |
| Semi-amplitude (K1) (primary) | 1.252+0.001 −0.002 km/s |
| Details | |
| HD 53705 | |
| Mass | 0.99+0.02 −0.01 M☉ |
| Radius | 1.24±0.02 R☉ |
| Luminosity | 1.52+0.07 −0.08 L☉ |
| Surface gravity (log g) | 4.29±0.02 cgs |
| Temperature | 5,826±8 K |
| Metallicity [Fe/H] | −0.230±0.006 dex |
| Rotational velocity (v sin i) | 1.6±0.5 km/s |
| Age | 9.29+0.25 −0.26 Gyr |
| HD 53706 | |
| Mass | 0.818±0.040 M☉ |
| Radius | 0.873±0.018 R☉ |
| Luminosity | 0.499±0.007 L☉ |
| Surface gravity (log g) | 4.461+0.011 −0.020 cgs |
| Temperature | 5192+9 −22 K |
| Metallicity [Fe/H] | −0.28±0.03 dex |
| Rotational velocity (v sin i) | 0.3±0.5 km/s |
| Age | 11.7+3.3 −9.6 (weakly constrained) Gyr |
| HD 53680 A | |
| Mass | 0.71±0.04 M☉ |
| Radius | 0.68±0.03 R☉ |
| Luminosity | 0.17+0.04 −0.02 L☉ |
| Surface gravity (log g) | 4.62±0.03 cgs |
| Temperature | 4,460±100 K |
| Metallicity [Fe/H] | −0.29±0.08 dex |
| Rotational velocity (v sin i) | 2.08±0.31 km/s |
| Age | 0.7 - 9.4 (weakly constrained) Gyr |
| HD 53680 B | |
| Mass | 0.22±0.02 M☉ |
| Other designations | |
| WDS J07040−4337 | |
| HD 53705: GJ 264.1 A, GJ 9223 A, HD 53705, HIP 34065, HR 2667, IRAS 07024−4332 A | |
| HD 53706: GJ 264.1 B, GJ 9223 B, HD 53706, HIP 34069, HR 2668, IRAS 07024−4332 B | |
| HD 53680: GJ 264, HD 53680, HIP 34052 | |
| Database references | |
| SIMBAD | HD 53705 |
| HD 53706 | |
| HD 53680 | |
HD 53705/53706/53680 is a star system that lies 56 light-years away in the constellation of Puppis. The system consists of four stars in two binaries, making it one of the nearest quadruple star systems.
The four components are a main sequence star similar to the Sun, two smaller K-type main sequence stars, and a low-mass star.