HR 7717
catalogues and names
| catalogues and names | HR 7717, HD 191984, SAO 125567, BD +0 4444 B, WDS 20126+0052A |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 20h 12min 35.2sec | DEC: +0° 52' 3'' | ||
| position (B1900) | RA: 20h 7min 29.1sec | DEC: +0° 34' 7'' | ||
| proper motion (J2000) | RA: 0.01 arcsec/a | DEC: -0.014 arcsec/a | ||
| radial velocity | -19 km/s | |||
| dynamical parallax | 0.009 arcsec | |||
| galactic coordinates | longitude: 43.3° | latitude: -17.56° | ||
magnitude
| visual magnitude | 6.27 (V on UBV Johnson system) |
spectral / color information
| spectral class | B9pCrEu:Sr: |
| B-V-magnitude | 0.02 |
| U-B-magnitude | -0.01 |
double/multiple star system information
| separation | 2.8 arcsec |
| mag difference (of double or brightest multiple) | 0.2 |
| note (category: double and multiple data): | Discordance as to which component has the peculiar spectrum usually attributed to A. However, on the basis of better spectrograms, Abt gives A = A0V, B = A0Vp(Sr,Cr st.,Ca wk.). |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 20h 12min 35.105sec | DEC: +0° 51' 59.74'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: 0.0009 arcsec/a | DEC: -0.032 arcsec/a | source: 25 | |
| radial velocity | -19 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 43.3° | latitude: -17.56° | ||
magnitude:
| visual | 6.27 (observed) | source: 25 |
| photovisual | 6.2 | source: 2 |
| photographic | 6.4 | source: 16 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | B9pCrEu:Sr: | source: 25 | |
| B-magnitude | 6.29 ±0.05 | B-V-magnitude | 0.02 |
| U-magnitude | 6.28 ±0.05 | U-B-magnitude | -0.01 |
double/multiple star system information:
| separation between brightest and second brightest component | 2.7 arcsec |
| magnitude difference between brightest and second brightest component | 0.2 |
| position angle | 206 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 6.27 | A0 | HR 7717, HD 191984, SAO 125567 |
| B | 6.28 | G5 |
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 | |
| 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: 20h 10min 2.129sec | DEC: +0° 42' 59.92'' | ±0.037 arcsec |
| position (J2000) | RA: 20h 12min 35.17sec | DEC: +0° 52' 2.57'' | |
| proper motion B1950 (FK4) | RA: 0.0005 arcsec/a | DEC: -0.011 arcsec/a | ±0.006 arcsec/a in RA ±0.005 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0007 arcsec/a | DEC: -0.014 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6.8 (accuracy: 1 decimal) |
| source of visual magnitude data | Based on Durchmusterung magnitudes and visual estimates |
spectral information:
| spectral class | A0 |
| 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: 28051 |
| Durchmusterung | BD+00 4444A |
| Boss General Catalogue | 28051 |
| Henry Draper Catalogue | 191984 Brighter component with a companion <= 0.3 mag fainter. |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 20h 12.6min | DEC: +0° 52' |
| proper motion (J2000) | RA: 0.014 arcsec/a | DEC: -0.032 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 |
| - | 1830 | often | 208° | 3.3'' | 6.9 | 7.1 | B9p | STF2644 |
| 1992 | 206° | 2.7'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF2644 | Struve, F.G.W. | - |
notes:
| note | Proper motion of B -001 -010. |