HR 5553
| Observation data Epoch 2000 Equinox 2000 |
|
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 53m 23.76674s[1] |
| Declination | +19° 09′ 10.0813″[1] |
| Apparent magnitude (V) | 6.00[2] |
| Characteristics | |
| Spectral type | K0 V[3] |
| U−B color index | +0.49[3] |
| B−V color index | +0.84[3] |
| Astrometry | |
| Radial velocity (Rv) | −29.82 ± 0.15[4] km/s |
| Proper motion (μ) | RA: −442.23[1] mas/yr Dec.: +217.61[1] mas/yr |
| Parallax (π) | 86.88 ± 0.46[1] mas |
| Distance | 37.5 ± 0.2 ly (11.51 ± 0.06 pc) |
| Orbit[3] | |
| Period (P) | 125.396 ± 0.001 d |
| Semi-major axis (a) | 0.19 ± 0.03 AU |
| Eccentricity (e) | 0.51 ± 0.001 |
| Inclination (i) | 93.4 ± 4.2° |
| Longitude of the node (Ω) | 248.3° ± 3.6° |
| Argument of periastron (ω) (secondary) |
219° ± 0.1° |
| Details | |
| HR 5553 A | |
| Mass | 0.84[5] M☉ |
| Radius | 0.86[5] R☉ |
| Luminosity | 0.498[5] L☉ |
| Surface gravity (log g) | 4.57[6] cgs |
| Temperature | 5,313[6] K |
| Metallicity [Fe/H] | 0.10[6] dex |
| Rotation | 10.4[6] |
| Rotational velocity (v sin i) | 4.0[6] km/s |
| Age | 0.7–1.3[7] Gyr |
| HR 5553 B | |
| Mass | 0.45[3] M☉ |
| Other designations | |
HR 5553 is a binary star system located thirty-eight light-years away, in the constellation Boötes. The combined spectrum of the pair matches that of a K-type main sequence star with a stellar classification of K0 V. The two stars orbit each other with a period of 125 days and a large eccentricity of 0.51.[3]
An infrared excess has been detected around this star, most likely indicating the presence of a circumstellar disk at a radius of 34.2 AU. The temperature of this dust is 40 K.[6] The estimated mass of the dust is 0.0002 times the mass of the Earth.[5]
References
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