88 Tauri

This article is about d Tauri. Not to be confused with δ Tauri.
88 Tauri
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
88 Tau A
Right ascension 04h 35m 39.25910s[1]
Declination +10° 09′ 38.8396″[1]
Apparent magnitude (V) 4.250[2]
88 Tau B
Right ascension 04h 35m 35.1775s[3]
Declination +10° 10′ 13.572″[3]
Apparent magnitude (V) 7.84[4]
Characteristics
88 Tau A
Spectral type A6m / F5 / G2-3: / G2-3:[5]
U−B color index +0.08[4]
B−V color index +0.19[4]
88 Tau B
Spectral type F8V / M?[6]
U−B color index +0.04[7]
B−V color index +0.54[7]
Astrometry
88 Tau A
Radial velocity (Rv)23.97[8] km/s
Proper motion (μ) RA: 43.13[1] mas/yr
Dec.: -52.71[1] mas/yr
Parallax (π)20.88 ± 0.94 mas[1]
Distance156 ± 7 ly
(48 ± 2 pc)
88 Tau B
Radial velocity (Rv)23.97[9] km/s
Proper motion (μ) RA: 51.8[2] mas/yr
Dec.: -49.4[2] mas/yr
Orbit[5]
Primary88 Tau Aa
Companion88 Tau Ab
Period (P)6585 ± 12 d
Semi-major axis (a)240.1 ± 5.3 mas
12.17 ± 0.17 AU
Eccentricity (e)0.0715 ± 0.0026
Inclination (i)69.923 ± 0.048°
Longitude of the node (Ω)146.734 ± 0.067°
Periastron epoch (T)2455261 ± 22
Argument of periastron (ω)
(secondary)		205.7 ± 1.2°
Orbit[5]
Primary88 Tau Aa1
Companion88 Tau Aa2
Period (P)3.571096 ± 0.000003 d
Semi-major axis (a)1.359 ± 0.034 mas
0.0689 ± 0.0012 AU
Eccentricity (e)0
Inclination (i)110.6 ± 2.7°
Longitude of the node (Ω)287.5 ± 1.8°
Periastron epoch (T)2453389.3824 ± 0.0030
Argument of periastron (ω)
(secondary)		0°
Orbit[5]
Primary88 Tau Ab1
Companion88 Tau Ab2
Period (P)7.886969 ± 0.000066 d
Semi-major axis (a)1.967 ± 0.054 mas
0.0997 ± 0.0021 AU
Eccentricity (e)0
Inclination (i)27.23 ± 0.72°
Longitude of the node (Ω)34.0 ± 8.2°
Periastron epoch (T)2452507.31 ± 0.02
Argument of periastron (ω)
(secondary)		0°
Orbit[6]
Primary88 Tau Ba
Companion88 Tau Bb
Period (P)1350 ± 35 d
Semi-major axis (a)0.057″
Eccentricity (e)0.663 ± 0.075
Periastron epoch (T)2450498 ± 34
Argument of periastron (ω)
(secondary)		223 ± 9°
Semi-amplitude (K1)
(primary)		3.24 ± 0.44 km/s
Details
88 Tau Aa1
Mass2.06 ± 0.11[5] M☉
Rotational velocity (v sin i)37 ± 2[5] km/s
88 Tau Aa2
Mass1.361 ± 0.073[5] M☉
Rotational velocity (v sin i)17 ± 2[5] km/s
88 Tau Ab1
Mass1.069 ± 0.069[5] M☉
Rotational velocity (v sin i)5 ± 3[5] km/s
88 Tau Ab2
Mass1.057 ± 0.068[5] M☉
Rotational velocity (v sin i)5 ± 3[5] km/s
88 Tau Ba
Mass1.2[6] M☉
88 Tau Bb
Mass>0.15[6] M☉
Other designations
ADS 3317, CCDM J04356+1010, WDS J04357+1010AB
88 Tau A: d Tau, 88 Tau, BD+09° 607, HD 29140, HIP 21402, SAO 94026, HR 1458, GC 5599[10]
88 Tau B: BD+09° 606, HD 286909, SAO 94024, GC 5596, TYC 673-1487-1[11]
Database references
SIMBAD88 Tau
88 Tau A
88 Tau B

88 Tauri, also known as d Tauri, is a multiple star system in the constellation Taurus. It has an apparent magnitude of about 4.25, meaning that it is visible to the naked eye. Based upon parallax measurements made by the Hipparcos spacecraft, the star system is some 156 light-years (48 parsecs) from the Sun.[1]

88 Tauri is a sextuple star system, meaning that it contains six stars in a hierarchical orbit. The brighter component, 88 Tauri A, is a quadruple system consisting of two spectroscopic binaries orbiting each other with an orbital period of 18 years. The fainter component, 88 Tauri B, is also a spectroscopic binary, and is about 69 arcseconds away, bringing up the total to six stars.[5]

  1. ^ 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.
  2. ^ a b c Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. ^ a b Hog, E. (1998). "The Tycho Reference Catalogue". Astronomy and Astrophysics. 335: L65. Bibcode:1998A&A...335L..65H.
  4. ^ a b c Feinstein, A. (1974). "Photoelectric UBVRI observations of Am stars". Astronomical Journal. 79: 1290. Bibcode:1974AJ.....79.1290F. doi:10.1086/111675. (Accessed using SIMBAD)
  5. ^ a b c d e f g h i j k l m Lane, Benjamin F.; Muterspaugh, Matthew W.; Fekel, Francis C.; Williamson, Michael; Browne, Stanley; Konacki, Maciej; Burke, Bernard F.; Colavita, M. M.; Kulkarni, S. R.; Shao, M. (2007). "The Orbits of the Quadruple Star System 88 Tauri A from PHASES Differential Astrometry and Radial Velocity". The Astrophysical Journal. 669 (2): 1209–1219. arXiv:0710.2127. Bibcode:2007ApJ...669.1209L. doi:10.1086/520877. S2CID 12957785.
  6. ^ a b c d Tokovinin, A. A.; Gorynya, N. A. (2001). "New spectroscopic components in multiple systems. IV". Astronomy and Astrophysics. 374: 227–234. Bibcode:2001A&A...374..227T. doi:10.1051/0004-6361:20010714.
  7. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  8. ^ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
  9. ^ Tokovinin, A. A.; Smekhov, M. G. (2002). "Statistics of spectroscopic sub-systems in visual multiple stars". Astronomy and Astrophysics. 382: 118–123. Bibcode:2002A&A...382..118T. doi:10.1051/0004-6361:20011586.
  10. ^ Cite error: The named reference SimbadA was invoked but never defined (see the help page).
  11. ^ "88 Tau B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 February 2017.