MQ Serpentis
catalogues and names
| catalogues and names | MQ Ser, 5 Ser, HR 5694, HD 136202, SAO 120946, BD +2 2944, WDS 15193+0146A |
| constellation | Serpens |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 19min 18.8sec | DEC: +1° 45' 55'' | ||
| position (2000.73) | RA: 15h 19min 21sec | DEC: +1° 45' 45'' | ||
| position (B1900) | RA: 15h 14min 12.4sec | DEC: +2° 8' 37'' | ||
| proper motion (J2000) | RA: 0.374 arcsec/a | DEC: -0.514 arcsec/a | ||
| radial velocity | 54 km/s note: variable radial velocity |
|||
| rotational velocity | 2 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.037 arcsec | |||
| galactic coordinates | longitude: 3.68° | latitude: 46.46° | ||
| note (category: dynamical parallaxes): | 0.034". |
magnitude
| visual magnitude | 5.06 (V on UBV Johnson system) |
spectral / color information
| spectral class | F8III-IV |
| B-V-magnitude | 0.54 |
| U-B-magnitude | 0.06 |
| R-I-magnitude |
variability information
| variable star identification | MQ Ser |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 11.2 arcsec |
| mag difference (of double or brightest multiple) | 4.6 |
| component ID | AB |
| note (category: double and multiple data): | AB binary. Some disagreement as to whether B or C, at 127" from A, is the brighter. |
miscellaneous information
| note (category: group membership): | Not member of Gamma Leo group but previously listed as such. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 19min 18.786sec | DEC: +1° 45' 55.63'' | ±0.2 arcsec | source: 52 |
| position (2000.73) | RA: 15h 19min 21sec | DEC: +1° 45' 46'' | JD: 2451810.97 | |
| proper motion (J2000) | RA: 0.0245 arcsec/a | DEC: -0.513 arcsec/a | source: 25 | |
| radial velocity | 54 km/s | source: 25 | ||
| trigonometric parallax | 0.037 arcsec | ±0.004 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 3.68° | latitude: 46.46° | ||
magnitude:
| visual | 5.06 (observed) | source: 25 |
| photovisual | 5.2 | source: 2 |
| photographic | 5.6 | source: 16 |
spectral information:
| spectral class | G0 | source: 96 | |
| Morgan-Keenan | F8III-IV | source: 25 | |
| B-magnitude | 5.6 ±0.05 | B-V-magnitude | 0.54 |
| U-magnitude | 5.66 ±0.05 | U-B-magnitude | 0.06 |
variability information:
| variability type | 440 |
| var. amplitude | 0.1 |
double/multiple star system information:
| separation between brightest and second brightest component | 11.3 arcsec |
| magnitude difference between brightest and second brightest component | 5.05 |
| position angle | 36 ° |
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 | |
| 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 | |
| 27 | Catalog of Red Magnitudes (CRM) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994 | |
| 52 | PPMN-HP subset |
| PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
| 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: 15h 16min 45.435sec | DEC: +1° 57' 11.93'' | ±0.01 arcsec |
| position (2000.73) | RA: 15h 19min 19sec | DEC: +1° 46' 12'' | JD: 2451810.97 |
| position (J2000) | RA: 15h 19min 18.807sec | DEC: +1° 45' 55.41'' | |
| proper motion B1950 (FK4) | RA: 0.0247 arcsec/a | DEC: -0.518 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.025 arcsec/a | DEC: -0.514 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.2 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | G0 |
| 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: 20591 |
| Durchmusterung | BD+02 2944 |
| Boss General Catalogue | 20591 |
| Henry Draper Catalogue | 136202 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 15h 19.3min | DEC: +1° 46' |
| proper motion (J2000) | RA: 0.375 arcsec/a | DEC: -0.515 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 | 1831 | 32 | 41° | 10.1'' | 5.06 | 10.11 | F8V | STF1930 |
| 1960 | 36° | 11.3'' | ||||||
| AC | 1887 | 4 | 51° | 124.6'' | 5.2 | 9.2 | - | STF1930 |
| 1924 | 40° | 127.2'' | ||||||
| AD | 1852 | 4 | ° | '' | 5.2 | - | - | STF1930 |
discoverer information:
| discoverer code | discoverer | reference |
| STF1930 | Struve, F.G.W. | - |
notes:
| note | 5 Ser. AB: Mt. Wilson spectral types F5s, M0. AD: See BDS and ADS for rectangular measures. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 15h 16min 45.4sec | DEC: +1° 57' 12'' |
variability informations:
| variability type | BY: | rotating variable star |
| magnitute at max. brightness | 4.99 | |
| magnitute at min. brightness | 5.11 | |
| photometric system | visual, photovisual or Johnson's V |
references
| to a study | G.A.Bakos, AJ 88,674,1983. |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 76/279 |
| constellation | Serpens |
| notes on existence | The star is equivalent to '67328'. |
variability type description
| variability type | description |
| BY | BY Draconis-type variables, which are emission-line dwarfs of dKe-dMe spectral type showing quasiperiodic light changes with periods from a fraction of a day to 120 days and amplitudes from several hundredths to 0.5 mag in V. The light variability is caused by axial rotation of a star with a variable degree of nonuniformity of the surface brightness (spots) and chromospheric activity. Some of these stars also show flares similar to those of UV Cet stars, and in those cases they also belong to the latter type and are simultaneously considered eruptive variables. |