t Librae
| catalogues and names |
| The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) |
| SKY2000 - Master Star Catalog |
| Smithsonian Astrophysical Observatory Star Catalog |
catalogues and names
| catalogues and names | t Lib, 40 Lib, HR 5812, HD 139365, SAO 183649, CD -29 11837 |
| constellation | Libra |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 38min 39.4sec | DEC: -29° 46' 40'' | ||
| position (B1900) | RA: 15h 32min 30.7sec | DEC: -29° 26' 56'' | ||
| proper motion (J2000) | RA: -0.015 arcsec/a | DEC: -0.03 arcsec/a | ||
| radial velocity | 3 km/s note: spectroscopic binaries |
|||
| rotational velocity | 149 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 341.06° | latitude: 20.45° | ||
magnitude
| visual magnitude | 3.66 (V on UBV Johnson system) |
spectral / color information
| spectral class | B2.5V |
| B-V-magnitude | -0.17 |
| U-B-magnitude | -0.7 |
| R-I-magnitude |
| note (category: spectra): | A Perkins Obs. spectrogram May 8, 1962 showed two spectra, sep. 200k/s, B3V, vsini 149k/s and B5:, vsini 100:k/s. |
miscellaneous information
| note (category: group membership): | Sco OB2; Sco-Cen assoc.; probable member of Sco-Cen cluster; upper Sco region. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 38min 39.377sec | DEC: -29° 46' 39.97'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.0017 arcsec/a | DEC: -0.02 arcsec/a | source: 25 | |
| radial velocity | 3 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 341.07° | latitude: 20.45° | ||
magnitude:
| visual | 3.66 (observed) | source: 25 |
| photovisual | 3.8 | source: 2 |
| photographic | 3.6 | source: 2 |
spectral information:
| spectral class | B3 | source: 96 | |
| Morgan-Keenan | B2.5V | source: 25 | |
| B-magnitude | 3.49 ±0.05 | B-V-magnitude | -0.17 |
| U-magnitude | 2.79 ±0.05 | U-B-magnitude | -0.7 |
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 | |
| 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: 15h 35min 34.733sec | DEC: -29° 36' 53.56'' | ±0.015 arcsec |
| position (J2000) | RA: 15h 38min 39.386sec | DEC: -29° 46' 40.28'' | |
| proper motion B1950 (FK4) | RA: -0.0011 arcsec/a | DEC: -0.033 arcsec/a | ±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0012 arcsec/a | DEC: -0.03 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3.8 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B3 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 21019 |
| Durchmusterung | CD-2911837 |
| Boss General Catalogue | 21019 |
| Henry Draper Catalogue | 139365 |