Xi Boötis
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| Observation data Equinox J2000 |
|
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 51m 23.4s |
| Declination | +19° 06′ 02″ |
| Apparent magnitude (V) | 4.70/6.97 |
| Characteristics | |
| Spectral type | G8 Ve/K4 Ve |
| U-B color index | 0.24/1.15 |
| B-V color index | 0.73/1.15 |
| Variable type | BY Draconis/None |
| Astrometry | |
| Radial velocity (Rv) | +1.0 km/s |
| Proper motion (μ) | RA: 152.81 mas/yr Dec.: -71.28 mas/yr |
| Parallax (π) | 147.57 ± 0.72 mas |
| Distance | 22.1 ± 0.1 ly (6.78 ± 0.03 pc) |
| Absolute magnitude (MV) | 5.54/7.81 |
| Visual binary orbit | |
| Companion | Xi Boötis B |
| Period (P) | 151.6 a |
| Semimajor axis (a) | 4.94" |
| Eccentricity (e) | 0.51 |
| Inclination (i) | 140.04° |
| Node (Ω) | 348.1° |
| Periastron epoch (T) | 1909.361 |
| Details | |
| Mass | 0.9/0.7 M☉ |
| Radius | 0.89/0.71 R☉ |
| Luminosity | 0.49/0.061 L☉ |
| Temperature | 5128K/3410 K |
| Metallicity | 55-155/? % |
| Rotation | ? |
| Age | < 109 years |
| Other designations | |
|
37 Boötis, Gl 566, HR 5544, BD +19°2870, HD 131156, GCTP 3360.00, SAO 101250, Struve 1888, ADS 9413, GC 19991, CCDM 14513+1906 and HIP 72659
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| Database references | |
| SIMBAD | data |
| ARICNS | data |
Xi Boötis (ξ Boo / ξ Boötis) is a double star system 21.8 light years away from Earth. It is the nearest star in the constellation Boötes.
The primary star in this system, ξ Boötis A, is a BY Draconis variable with an apparent magnitude that varies from +4.52 to +4.67 with a period just over 10 days long, and is classified as a yellow G-type main sequence dwarf. Small velocity changes in the orbit of the companion star, ξ Boötis B, an orange K-type main sequence dwarf, indicate the presence of a small companion that is less than nine times the mass of Jupiter.[citation needed] The AB binary can be resolved and displays a gorgeous sight even through smaller telescopes.
The primary star (A) has been identified as a candidate for possessing a kuiper-like belt,[1] based on infrared observations. The estimated minimum mass of this dust disk is 2.4 times the mass of the Earth's Moon. (Compare to the value of 8.2 lunar masses for the Kuiper belt.)[2]
[edit] References
- ^ Hinshaw, Gary (February 3, 1997). Science Requirements Document (PDF). NASA JPL. Retrieved on 2006-08-10.
- ^ E. K. Holmes, H. M. Butner, S. B. Fajardo-Acosta, and L. M. Rebull (2003). "A Survey of Nearby Main-Sequence Stars for Submillimeter Emission". The Astronomical Journal 125 (2): 3334–3343.
[edit] External links
- Xi Boötis. SolStation. Retrieved on November 3, 2005.
- Xi Boötis. Alcyone. Retrieved on March 14, 2006.
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