HD 10647
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Eridanus |
| Right ascension | 1h 42m 29.32s [1] |
| Declination | –53° 44′ 27.0″ [1] |
| Apparent magnitude (V) | +5.52 |
| Characteristics | |
| Spectral type | F9V |
| U−B color index | ? |
| B−V color index | 0.551 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | 12.9 km/s |
| Proper motion (μ) | RA: 166.32 ± 0.24 [1] mas/yr Dec.: -106.52 ± 0.27 [1] mas/yr |
| Parallax (π) | 57.36 ± 0.25[1] mas |
| Distance | 56.9 ± 0.2 ly (17.43 ± 0.08 pc) |
| Absolute magnitude (MV) | +4.32 |
| Details | |
| Mass | 1.07 M☉ |
| Radius | 1.11 R☉ |
| Luminosity | 1.51 L☉ |
| Temperature | 6143 ± 31 K |
| Metallicity | -0.03 ± 0.04 [Fe/H] ~0.93 times Solar |
| Rotation | 7.2 days |
| Age | 1750 million years |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 10647, also known as q1 Eridani by the extended Bayer system, is a yellow-white dwarf star approximately 57 light-years away in the constellation of Eridanus (the River). It is a relatively nearby 6th (almost 5th) magnitude star. The star should be visible to the unaided eye under very dark skies, but with binoculars it is an easy target. It is slightly hotter and more luminous than the Sun. It is also younger being 1,750 million years old. As of 2003, a long-period extrasolar planet has been confirmed to orbit around the star.
[edit] Planetary system
In 2003, Michel Mayor's team announced the discovery of a new planet, HD 10647 b, in Paris at the XIX IAP Colloquium Extrasolar Planets: Today & Tormorrow. The Anglo-Australian Planet Search team could not detect the planet, but that can be due to the poor coverage of observations. The star is also chromospherically active, making radial velocity observations more difficult.
The IRAS infrared space telescope detected an excess of infrared radiation from the star, indicating a possible circumstellar disk.[2] Using this data and later observations with the Spitzer Space Telescope, Infrared Space Observatory and the Atacama Pathfinder Experiment implies that the disk is located at 25 Astronomical units and has a ring like structure.[3] Because of the age of the star, the disk probably is somewhat similar to our Solar System's Kuiper belt instead of a protoplanetary disk seen around young stars like Vega.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | >0.93 ± 0.18 MJ | 2.03 ± 0.15 | 1003 ± 56 | 0.16 ± 0.22 |
[edit] References
- ^ a b c d e van Leeuwen, F. (2007). "HIP 7978". Hipparcos, the New Reduction. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=7963. Retrieved 2009-12-06.
- ^ Stencel and Backman; Backman, Dana E. (1991). "A survey for infrared excesses among high galactic latitude SAO stars". The Astrophysical Journal Supplement Series 75: 905–924. Bibcode 1991ApJS...75..905S. doi:10.1086/191553.
- ^ Liseau et al (2008). "q1 Eridani: a solar-type star with a planet and a dust belt". Astronomy and Astrophysics Letters 480 (3): L47–L50. Bibcode 2008A&A...480L..47L. doi:10.1051/0004-6361:20079276. http://www.aanda.org/articles/aa/full/2008/12/aa9276-07/aa9276-07.html.
- ^ Butler et al (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode 2006ApJ...646..505B. doi:10.1086/504701. http://www.iop.org/EJ/article/0004-637X/646/1/505/64046.html.
[edit] External links
- "HD 10647". The Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+10647. Retrieved 29 June 2003.
- "q1 Eridani". Extrasolar Visions. http://www.extrasolar.net/planettour.asp?StarCatId=&PlanetId=251.
- "A Jovian planet around HD 10647". Geneva Observatory. http://obswww.unige.ch/~udry/planet/hd10647.html.
- "HD 10647 / HR 506 / CP(D)-54 365 (q1 Eridani)". SolStation. http://www.solstation.com/stars2/hd10647.htm. Retrieved 2008-06-12.
Coordinates: 
01h 42m 29.32s, −53° 44′ 27.00″
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