104 Tauri
catalogues and names
catalogues and names | 104 Tau, HR 1656, HD 32923, SAO 94332, BD +18 779, WDS 05074+1839 |
constellation | Taurus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 5h 7min 27sec | DEC: +18° 38' 42'' | ||
position (B1900) | RA: 5h 1min 32.3sec | DEC: +18° 30' 39'' | ||
proper motion (J2000) | RA: 0.537 arcsec/a | DEC: 0.016 arcsec/a | ||
radial velocity | 20 km/s note: suspected variable radial velocity |
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rotational velocity | 2 km/s (uncertain) (variable) | |||
trigonometric parallax | 0.061 arcsec | |||
galactic coordinates | longitude: 183.83° | latitude: -12.94° |
note (category: dynamical parallaxes): | Uncertain, 0.023" to 0.138". |
magnitude
visual magnitude | 5 (V on UBV Johnson system) |
spectral / color information
spectral class | G4V |
B-V-magnitude | 0.65 |
U-B-magnitude | 0.14 |
double/multiple star system information
separation | 0.1 arcsec |
mag difference (of double or brightest multiple) | 0.1 |
note (category: double and multiple data): | 5.6 G4V, 5.6 G4V, 1.19y, a = 0.18"; or 2.38y, a = 0.10"; or 5.8y, a = 0.11". Combined mag., colors. Sep. 0.099". Unresolved by speckle interferometry 1983.93. |
miscellaneous information
note (category: group membership): | Hyades? |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 5h 7min 26.995sec | DEC: +18° 38' 42.79'' | ±0.43 arcsec | source: 16 |
proper motion (J2000) | RA: 0.0372 arcsec/a | DEC: 0.032 arcsec/a | source: 25 | |
radial velocity | 20 km/s | source: 25 | ||
trigonometric parallax | 0.061 arcsec | ±0.006 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 183.84° | latitude: -12.94° |
magnitude:
visual | 4.92 (observed) | source: 25 |
photovisual | 5 | source: 2 |
photographic | 5.6 | source: 16 |
spectral information:
spectral class | G0 | source: 96 | |
Morgan-Keenan | G4V | source: 25 | |
B-magnitude | 5.56 ±0.05 | B-V-magnitude | 0.64 |
U-magnitude | 5.7 ±0.05 | U-B-magnitude | 0.14 |
double/multiple star system information:
magnitude difference between brightest and second brightest component | 0 |
sources:
2 | HD and HDE Catalogs |
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University | |
16 | PPM North and PPM South Catalogs and PPM Supplement |
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993 | |
19 | WDS Catalog |
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996 | |
25 | Bright Star Catalogue, 5th edition |
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994 | |
96 | SAO or HD/HDE Catalog |
Reference from Value 1 or Reference from Value 2 |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
position (B1950) | RA: 5h 4min 29.507sec | DEC: +18° 34' 46.97'' | ±0.013 arcsec |
position (J2000) | RA: 5h 7min 27.014sec | DEC: +18° 38' 41.94'' | |
proper motion B1950 (FK4) | RA: 0.0378 arcsec/a | DEC: 0.019 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0.0378 arcsec/a | DEC: 0.016 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 5 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
spectral class | G0 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
Double star in Aitken's Double Star Catalogue (Aitken 1932) |
catalogues
source catalogue | GC, catalogue number: 6255 |
Durchmusterung | BD+18 779 |
Boss General Catalogue | 6255 |
Henry Draper Catalogue | 32923 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
position (J2000) | RA: 5h 7.4min | DEC: +18° 39' |
proper motion (J2000) | RA: 0.533 arcsec/a | DEC: 0.019 arcsec/a |
double/multiple star system information:
component | year | number of measures | position angle | angular separation | magnitude of 1st component | magnitude of 2nd component | spectral class(es) | discoverer code |
- | 1912 | 16 | ° | '' | 5.8 | 5.8 | G1V | A 3010 |
discoverer information:
discoverer code | discoverer | reference |
A 3010 | Aitken, R.G. | - |
notes:
note | 104 Tau. Ambiguous and uncertain orbits of P = 1.2 and 2.4yr. have been computed. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
position (B1900) | RA: 5h 1.5min | DEC: +18° 31' |
magnitudes, spectral classes, orbital elements:
author: | O.J. Eggen | O.J. Eggen |
date of observation: | 1953 | 1953 |
magnitude of component A: | 5.7 | 5.7 |
magnitude of component B: | 5.7 | 5.7 |
spectral class component B: | G4V | G4V |
spectral class component B: | G4V | G4V |
period [y]: | 1.19 | 2.38 |
semi-major axis [arcsec]: | 0.18 | 0.1 |
inclination [deg]: | 73 | 0 |
node [deg]: | 122.3 | 0 |
eccentricity: | 0.9 | 0 |
time of periastron passage: | 1911.37 | 1910.6 |
grade: | indeterminate (ambiguous) | indeterminate (ambiguous) |
reference: | Astron. J. 61, 414; 1956. Orbit 1. | Ibid. Orbit 2. |
notes | Observations of this close pair are so scattered that both orbits are highly conjectural. |
other name(s) | A 3010, 104 Tau |