d2Telescopii
| catalogues and names | d2Tel, HR 6938, HD 170523, SAO 229095 |
| constellation | Telescopium |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 18h 32min 2sec | DEC: -45° 45' 26'' |
| position (J1900) | RA: 18h 24min 38,2sec | DEC: -45° 49' 33'' |
| proper motion (J2000) | RA: 0,004 arcsec/a | DEC: -0,008 arcsec/a |
| radial velocity | 8 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible |
|
| rotational velocity | 24 km/s (uncertain) (variable) | |
magnitude
| visual magnitude | 5,07 (V on UBV Johnson system) |
spectral / color information
| spectral class | B3III |
| B-V-magnitude | -0,14 |
| U-B-magnitude | -0,56 |
double/multiple star system information
| note (category: spectroscopic binaries): | 21.7056d, K 34.9k/s, V0 -7.6k/s, asini 10.2. |
miscellaneous information
| note (category: group membership): | Sco-Cen assoc.; Sco-Cen cluster? |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 18h 32min 1,949sec | DEC: -45° 45' 26,67'' | ±0,19 arcsec | source: 16 |
| proper motion (J2000) | RA: 0,0002 arcsec/a | DEC: -0,018 arcsec/a | source: 25 | |
| radial velocity | 8 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 349,23° | latitude: -15,91° | ||
| GCI unit vector (J2000) | X: 0,097199 | Y: -0,690894 | Z: -0,716392 | |
magnitude:
| visual | 5,07 (observed) | source: 25 |
| photovisual | 5,2 | source: 16 |
spectral information:
| spectral class | B5 | source: 96 | |
| Morgan-Keenan | B3III | source: 25 | |
| B-magnitude | 4,93 ±0,05 | B-V-magnitude | -0,14 |
| U-magnitude | 4,37 ±0,05 | U-B-magnitude | -0,56 |
sources:
| 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 (J1950) | RA: 18h 28min 20,114sec | DEC: -45° 47' 37,43'' | ±0,026 arcsec |
| position (J2000) | RA: 18h 32min 1,982sec | DEC: -45° 45' 26,19'' | |
| proper motion J1950 (FK4) | RA: 0,0004 arcsec/a | DEC: -0,006 arcsec/a | ±0,005 arcsec/a in RA ±0,005 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0003 arcsec/a | DEC: -0,008 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 25273 |
| Durchmusterung | CD-4512556 |
| Boss General Catalogue | 25273 |
| Henry Draper Catalogue | 170523 |