t2Serpentis
| catalogues and names | t2Ser, 12 Ser, HR 5770, HD 138527, SAO 101600 |
| constellation | Serpens |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 32min 9,7sec | DEC: +16° 3' 22'' |
| position (J1900) | RA: 15h 27min 33,1sec | DEC: +16° 23' 43'' |
| proper motion (J2000) | RA: 0,001 arcsec/a | DEC: 0,009 arcsec/a |
| radial velocity | -18 km/s note: variable radial velocity |
|
| rotational velocity | 175 km/s (uncertain) (variable) | |
magnitude
| visual magnitude | 6,22 (V on UBV Johnson system) |
spectral / color information
| spectral class | B9V |
| B-V-magnitude | -0,05 |
| U-B-magnitude | -0,23 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 32min 9,68sec | DEC: +16° 3' 21,94'' | ±0,35 arcsec | source: 17 |
| proper motion (J2000) | RA: -0,0003 arcsec/a | DEC: 0,003 arcsec/a | source: 25 | |
| radial velocity | -18 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 24,8° | latitude: 51,22° | ||
| GCI unit vector (J2000) | X: -0,577799 | Y: -0,767889 | Z: 0,276578 | |
magnitude:
| visual | 6,22 (observed) | source: 25 |
| photovisual | 6,1 | source: 2 |
| photographic | 6,1 | source: 16 |
spectral information:
| spectral class | B9 | source: 96 | |
| Morgan-Keenan | B9V | source: 25 | |
| B-magnitude | 6,17 ±0,05 | B-V-magnitude | -0,05 |
| U-magnitude | 5,94 ±0,05 | U-B-magnitude | -0,23 |
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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991 | |
| 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 (J1950) | RA: 15h 29min 51,309sec | DEC: +16° 13' 28,43'' | ±0,024 arcsec |
| position (J2000) | RA: 15h 32min 9,694sec | DEC: +16° 3' 22,34'' | |
| proper motion J1950 (FK4) | RA: 0 arcsec/a | DEC: 0,005 arcsec/a | ±0,004 arcsec/a in RA ±0,004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0001 arcsec/a | DEC: 0,009 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6,1 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B9 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 20880 |
| Durchmusterung | BD+16 2797 |
| Boss General Catalogue | 20880 |
| Henry Draper Catalogue | 138527 |