HD 70573
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Stern HD 70573 |
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| Position of HD 70573 in the Hydra constellation | |||||||||
| AladinLite | |||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Water snake | ||||||||
| Right ascension | 08 h 22 m 50 s | ||||||||
| declination | + 01 ° 51 ′ 34 ″ | ||||||||
| Apparent brightness | 8.7 likes | ||||||||
| Typing | |||||||||
| Known exoplanets | 1 (?) | ||||||||
| B − V color index | +0.6 | ||||||||
| Spectral class | G1 V | ||||||||
| Astrometry | |||||||||
| Radial velocity | (+19.5 ± 1.0) km / s | ||||||||
| distance | approx. 150 ly approx. 46 pc |
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| Proper movement | |||||||||
| Rec. Share: | −54 mas / a | ||||||||
| Dec. portion: | −48 mas / a | ||||||||
| Physical Properties | |||||||||
| Dimensions | approx. 1 M ☉ | ||||||||
| Luminosity |
approx. 0.6 L ☉ |
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| Effective temperature | approx. 5700 K | ||||||||
| Metallicity [Fe / H] | approx. −0.2 | ||||||||
| Rotation time | 3.3 d | ||||||||
| Age | approx. 100 mill. a | ||||||||
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Other names and catalog entries |
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HD 70573 is a main sequence star of spectral class G in the constellation Hydra, about 150 light years from Earth . It has an apparent magnitude of 8.7 mag. HD 70573 has been identified as both a member of the Hercules Lyra Association and a member of the Pleiades Moving Group . HD 70573 is a very young star, in the range of 100 million years.
A study published in 2007 by Setiawan et al. disclosed a companion around HD 70573, which could be an exoplanet . The discovered fluctuations in radial velocity have a period of around 850 days and a semi-amplitude of around 150 m ∙ s −1 . This suggests a companion with a minimum mass of around 6 Jupiter's masses. The companion bears the systematic designation HD 70573 b . The major semi-axis of the orbit calculated for the companion measures just under 1.8 AU . The star is surrounded by a protoplanetary disk. Due to the low age of the system, it is potentially an interesting observation object for investigating the formation of planetary systems.
literature
- J. Setiawan, P. Weise, Th. Henning, R. Launhardt, A. Müller, J. Rodmann: Evidence for a planetary companion around a nearby young star. In: The Astrophysical Journal , vol. 660, no. 2, p. L145-L148 (May 10, 2007). bibcode : 2007ApJ ... 660L.145S