HR 753
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Cetus |
| Right ascension | A: 02h 36m 04.89s [1] B: 02h 36m 15.0s C: 02h 35m 58.8s |
| Declination | A: +06° 53′ 12.7″ [1] B: +06° 52′ 18″ C: +06° 52′ 00″ |
| Apparent magnitude (V) | 5.82/11.66/16.9 |
| Characteristics | |
| Spectral type | K3 V/M3.5 Vn/M7 V |
| U−B color index | 0.81/1.12 |
| B−V color index | 0.97/1.60 |
| Variable type | None/BY Draconis |
| Astrometry | |
| Radial velocity (Rv) | 25.7 km/s |
| Proper motion (μ) | RA: 1807.78 ± 0.89 [1] mas/yr Dec.: 1444.02 ± 0.40 [1] mas/yr |
| Parallax (π) | 139.27 ± 0.45[1] mas |
| Distance | 23.42 ± 0.08 ly (7.18 ± 0.02 pc) |
| Absolute magnitude (MV) | 6.49/12.34/17.58 |
| Details | |
| Mass | 0.81/0.21/0.08 M☉ |
| Radius | 0.79/0.28 R☉ |
| Luminosity | 0.21/0.0001/0.0000075 L☉ |
| Temperature | 4,841[2] K |
| Metallicity | 85.11%[2]/ ? Z☉ |
| Rotation | ? |
| Age | 4.8-6.6 (Sun=4.6) ×109 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
HR 753 (also known as 268 G. Ceti) is a triple star system in the constellation of Cetus. It is located relatively near the Sun at an estimated distance of less than 24 light years,[1] but even the brightest component is too faint to see directly with the unaided eye. No planets have yet been detected around any of the stars in this system.
The companion star B has a common proper motion with A, and the two have an estimated separation of 1,200 AUs. It is a BY Draconis variable star that has been given the designation "BX Ceti".
The third companion C lies much closer to A, at a distance of approximately 24 AU. The pair A-C have an estimated orbital period of 61 years. Component C is a relatively minuscule star that lies at the low end of the mass range needed to achieve nuclear fusion.
[edit] References
- ^ a b c d e f van Leeuwen, F. (2007). "HIP 12114". Hipparcos, the New Reduction. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=12082. Retrieved 2010-08-22.
- ^ a b Soubiran, C.; Bienaymé, O.; Mishenina, T. V.; Kovtyukh, V. V. (2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy and Astrophysics 480 (1): 91–101. Bibcode 2008A&A...480...91S. doi:10.1051/0004-6361:20078788.
[edit] External links
- Gliese 105 / HR 753 ABC SolStation entry.
- Hubble Spies a Really Cool Star
- Gliese 105
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