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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
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| Constellation | Delphinus | |
| Component | A | B |
| Right ascension | 20h 37m | 20h 37m |
| 32.944s | 32.934s | |
| Declination | +14° 35′[1] | +14° 35′[2] |
| 42.33″ | 42.28″ | |
| Apparent magnitude (V) | 4.11[3] | 5.02[3] |
| 3.632[4] | ||
| Characteristics | ||
| Spectral type | F5IV[3] | F2V[3] |
| U-B color index | +0.08[5] | |
| B-V color index | +0.44[5] | |
| R-I color index | +0.24[5] | |
| Astrometry | ||
| Radial velocity (Rv) | −24.1 ± 0.9[6][7] km/s | |
| Proper motion: | ||
| RA (μα cos δ) | 119.81[1] mas/yr | 114.75[2] mas/yr |
| Dec. (μδ) | −53.57[1] mas/yr | −33.97[2] mas/yr |
| Parallax (π) | 33.49 ± 0.88[4] mas | |
| Distance | 97 ± 3 ly (29.9 ± 0.8 pc) |
|
| Absolute magnitude (MV) | 1.26[8] | |
| Details | ||
| Mass | 2.2[5] M☉ | 1.8[5] M☉ |
| Luminosity | 18[9] L☉ | 8[9] L☉ |
| Orbit[10] | ||
| Period (P) | 26.65 y | |
| Semimajor axis (a) | 0.443″ | |
| Eccentricity (e) | 0.355 | |
| Inclination (i) | 62.1° | |
| Longitude of node (Ω) | 177.9° | |
| Periastron epoch (T) | B1962.87 | |
| Argument of periastron (ω) (secondary) |
348.8° | |
| Database references | ||
| SIMBAD | data | |
| Other designations | ||
Beta Delphini (Beta Del, β Delphini, β Del) is a binary star in the constellation of Delphinus. As a practical joke, the astronomer Niccolò Cacciatore gave it the name Rotanev, which is a reversal of his Latinized family name, Venator.[5]
In Chinese, 瓠瓜 (Hù Guā), meaning Good Gourd, refers to an asterism consisting of β Delphini, α Delphini, γ2 Delphini, δ Delphini, and ζ Delphini.[11] Consequently, β Delphini itself is known as 瓠瓜四 (Hù Guā yī, English: the Second Star of Good Gourd.)[12].
[edit] See also
[edit] References
- ^ a b c HIP 101769, record for component 1, Hipparcos catalogue; CDS ID I/239.
- ^ a b c HIP 101769, record for component 2, Hipparcos catalogue; CDS ID I/239.
- ^ a b c d e Entry 20375+1436, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line October 1, 2008.
- ^ a b c HD 196524 -- Spectroscopic binary, database entry, SIMBAD. Accessed on line October 1, 2008.
- ^ a b c d e f g HR 7882, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line October 1, 2008.
- ^ This value is for the barycenter of the binary system.
- ^ Table 3, Multiplicity among solar-type stars, H. A. Abt and S. G. Levy, Astrophysical Journal Supplement Series 30 (March 1976), pp. 273–306, Bibcode: 1976ApJS...30..273A.
- ^ From apparent magnitude and parallax.
- ^ a b Rotanev, Stars, Jim Kaler. Accessed on line October 1, 2008.
- ^ Entry 20375+1436, Sixth Catalog of Orbits of Visual Binary Stars, United States Naval Observatory. Accessed on line October 1, 2008.
- ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
[edit] External links
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