XX Camelopardalis
| catalogues and names |
| SKY2000 - Master Star Catalog |
| Smithsonian Astrophysical Observatory Star Catalog |
| Combined General Catalogue of Variable Stars (Vol. I-III) |
catalogues and names
| catalogues and names | XX Cam, HD 25878, SAO 24431, BD +52 771 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 4h 8min 38.727sec | DEC: +53° 21' 39.4'' | ±0.42 arcsec | source: 16 |
| position (2000.74) | RA: 4h 8min 42sec | DEC: +53° 21' 46'' | JD: 2451813.20 | |
| proper motion (J2000) | RA: -0.0003 arcsec/a | DEC: -0.004 arcsec/a | source: 16 | |
| radial velocity | 15.5 km/s | source: 11 | ||
| galactic coord. (B1950) | longitude: 149.84° | latitude: 1.12° | ||
magnitude:
| visual | 7.29 (observed) | source: 20 |
| photovisual | 7.1 | source: 2 |
| photographic | 7.9 | source: 16 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | G1Iab:e | source: 30 | |
| B-magnitude | 8.11 ±0.005 | B-V-magnitude | 0.82 |
| U-magnitude | 8.41 ±0.05 | U-B-magnitude | 0.3 |
variability information:
| variability type | 230 |
| var. amplitude | 1.7 |
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 | |
| 11 | General Catalogue of Stellar Radial Velocities |
| Wilson, R.E., General Catalogue of Stellar of Stellar Radial Radial Velocities, Washington, DC: Carnegie Institute of Washington, 1953 | |
| 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 | |
| 20 | Catalogue of Homogeneous Means in the UBV System |
| Mermilliod, J.C., Catalogue of Homogeneous Means in the UBV System, Institut d'Astronomie, Universite de Lausanne, 1994 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 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 4min 46.077sec | DEC: +53° 13' 43.99'' | ±0.049 arcsec |
| position (2000.74) | RA: 4h 8min 42sec | DEC: +53° 21' 46'' | JD: 2451813.20 |
| position (J2000) | RA: 4h 8min 38.653sec | DEC: +53° 21' 39.3'' | |
| proper motion B1950 (FK4) | RA: -0.0008 arcsec/a | DEC: 0.001 arcsec/a | ±0.01 arcsec/a in RA ±0.009 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0009 arcsec/a | DEC: -0.001 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 7.1 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | K0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 4959 |
| Durchmusterung | BD+52 771 |
| Boss General Catalogue | 4959 |
| Henry Draper Catalogue | 25878 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 4h 4min 46.1sec | DEC: +53° 13' 44'' |
variability informations:
| variability type | RCB: | eruptive variable star |
| magnitute at max. brightness | 8.09 | |
| magnitute at min. brightness | 9.8 | |
| photometric system |
spectral information
| spectral class | G1I(C0-2,0) |
references
| to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
| to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
| ID in the GCVS catalogue | 11/49 |
| constellation | Camelopardalis |
| notes on existence | The star is equivalent to '0110050 XY'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| RCB | Variables of the R Coronae Borealis type. These are hydrogen-poor,carbon- and helium-rich, high-luminosity stars belonging to the spectral types Bpe-R, which are simultaneously eruptive and pulsating variables. They show slow nonperiodic fadings by 1-9 mag in V lasting from a month or more to several hundred days. These changes are superposed on cyclic pulsations with amplitudes up to several tenths of a magnitude and periods in the range 30-100 days. |