7 Camelopardalis
catalogues and names
| catalogues and names | NSV 16198, 7 Cam, HR 1568, HD 31278, SAO 24929, BD +53 829, WDS 04573+5345A |
| constellation | Camelopardalis |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 4h 57min 17.2sec | DEC: +53° 45' 8'' | ||
| position (B1900) | RA: 4h 49min 16sec | DEC: +53° 35' 32'' | ||
| proper motion (J2000) | RA: -0.024 arcsec/a | DEC: 0.007 arcsec/a | ||
| radial velocity | -8 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible |
|||
| rotational velocity | 45 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 154.47° | latitude: 6.68° | ||
magnitude
| visual magnitude | 4.47 (V on UBV Johnson system) |
spectral / color information
| spectral class | A1V |
| B-V-magnitude | -0.02 |
| U-B-magnitude | -0.01 |
| R-I-magnitude |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 0.4 arcsec |
| mag difference (of double or brightest multiple) | 3.4 |
| component ID | AB |
| note (category: double and multiple data): | AB 4.5, 7.8, 284.0y, a = 0.78". C, 11v at 26" CPM, possibly physical. |
| note (category: spectroscopic binaries): | ADS 3536A, 3.8845d, K 35.8k/s, V0 -9.5k/s, asini 1.91. |
miscellaneous information
| note (category: group membership): | UMa stream. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 4h 57min 17.237sec | DEC: +53° 45' 7.78'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: -0.0016 arcsec/a | DEC: 0.012 arcsec/a | source: 25 | |
| radial velocity | -8 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 154.47° | latitude: 6.68° | ||
magnitude:
| visual | 4.47 (observed) | source: 25 |
| photovisual | 4.4 | source: 2 |
| photographic | 4.5 | source: 16 |
spectral information:
| spectral class | A2 | source: 96 | |
| Morgan-Keenan | A1V | source: 25 | |
| B-magnitude | 4.45 ±0.05 | B-V-magnitude | -0.02 |
| U-magnitude | 4.44 ±0.05 | U-B-magnitude | -0.01 |
double/multiple star system information:
| separation between brightest and second brightest component | 0.5 arcsec |
| magnitude difference between brightest and second brightest component | 3.3 |
| position angle | 221 ° |
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: 4h 53min 16.194sec | DEC: +53° 40' 28.1'' | ±0.017 arcsec |
| position (J2000) | RA: 4h 57min 17.18sec | DEC: +53° 45' 7.64'' | |
| proper motion B1950 (FK4) | RA: -0.0026 arcsec/a | DEC: 0.008 arcsec/a | ±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0027 arcsec/a | DEC: 0.007 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.4 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A2 |
| 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: 6017 |
| Durchmusterung | BD+53 829 |
| Boss General Catalogue | 6017 |
| Henry Draper Catalogue | 31278 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 4h 57.3min | DEC: +53° 45' |
| proper motion (J2000) | RA: -0.014 arcsec/a | DEC: 0.013 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 |
| AB | 1865 | 18 | 309° | 1.2'' | 4.5 | 7.8 | A1V | D 5 |
| 1991 | 221° | 0.5'' | ||||||
| AB-C | 1831 | 9 | 240° | 25.8'' | 4.47 | 11.3 | - | STF 610 |
discoverer information:
| discoverer code | discoverer | reference |
| D 5 | Dembowski, E. | - |
| STF 610 | Struve, F.G.W. | - |
notes:
| note | 7 Cam. A premature orbit has been computed for AB. A is a spectroscopic binary. AB-C: C may be physical. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 4h 49.3min | DEC: +53° 36' |
magnitudes, spectral classes, orbital elements:
| author: | P. Baize |
| date of observation: | 1976 |
| magnitude of component A: | 4.5 |
| magnitude of component B: | 4.5 |
| spectral class component B: | A1V |
| spectral class component B: | A1V |
| period [y]: | 284 |
| semi-major axis [arcsec]: | 0.78 |
| inclination [deg]: | 137.9 |
| node [deg]: | 158.2 |
| equinox of node: | 1900 |
| eccentricity: | 0.74 |
| time of periastron passage: | 1986 |
| grade: | indeterminate |
| reference: | Circ. Inf. No. 79, 1979. |
| notes | The primary is a single-lined spectroscopic binary, P = 3.884 d (Lucy and Sweeney, Astron. J. 76, 544; 1971). Star C (mag. about 11.3, 26") may be physical. |
| other name(s) | D 5, 7 Cam |