Mu Serpentis, Latinized from μ Serpentis, is a binary star[6] in the Serpens Caput (head) section of the equatorial constellation Serpens. It is visible to the naked eye with an apparent visual magnitude of 3.543.[2] Based upon an annual parallax shift of 19.23 mas as seen from Earth,[1] it is located around 170 light years from the Sun.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 49m 37.20696s[1] |
| Declination | −03° 25′ 48.7358″[1] |
| Apparent magnitude (V) | 3.543[2] |
| Characteristics | |
| Spectral type | A0 V[3] |
| U−B color index | −0.025[2] |
| B−V color index | −0.032[2] |
| Astrometry | |
| Radial velocity (Rv) | −9.4±2.7[4] km/s |
| Proper motion (μ) | RA: −100.28[1] mas/yr Dec.: +25.99[1] mas/yr |
| Parallax (π) | 19.23 ± 0.38 mas[1] |
| Distance | 170 ± 3 ly (52 ± 1 pc) |
| Absolute magnitude (MV) | −0.04[5] |
| Orbit[6] | |
| Period (P) | 36±2 yr |
| Semi-major axis (a) | 0.110±0.010″ |
| Eccentricity (e) | 0.4±0.3 |
| Inclination (i) | 103±28° |
| Longitude of the node (Ω) | 296±28° |
| Periastron epoch (T) | 1988.9±1.8 |
| Argument of periastron (ω) (secondary) | 308±32° |
| Details | |
| μ Ser A | |
| Mass | 2.4 ± 0.4[6] M☉ |
| Luminosity | 92[7] L☉ |
| Temperature | 9,487[7] K |
| Rotational velocity (v sin i) | 96[8] km/s |
| μ Ser B | |
| Mass | 2.3 ± 0.4 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an astrometric binary for which coarse orbital elements have been determined based on interferometric observations. The pair orbit each other with a period of around 36 years and an eccentricity of roughly 0.4.[6] The primary member, component A, is a white-hued A-type main sequence star with a stellar classification of A0 V.[3] The nature of the secondary, component B, is less certain – it may be a class A or F type star of unknown luminosity class.[6]
In Chinese astronomy, Mu Serpentis is called 天乳, Pinyin: Tiānrǔ, meaning Celestial Milk, because this star is marking itself and stand alone in Celestial Milk asterism, Root mansion (see : Chinese constellation).[10]
References
edit- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile, 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, Bibcode:1966PDAUC...1....1G.
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e Gontcharov, G. A.; Kiyaeva, O. V. (March 2010), "Photocentric orbits from a direct combination of ground-based astrometry with Hipparcos II. Preliminary orbits for six astrometric binaries", New Astronomy, 15 (3): 324–331, arXiv:1606.08182, Bibcode:2010NewA...15..324G, doi:10.1016/j.newast.2009.09.006, S2CID 119252073.
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
- ^ "mu. Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-31.
{{cite web}}: CS1 maint: postscript (link) - ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 29 日