q2Serpentis
catalogues and names
catalogues and names | q2Ser, 63 Ser, HR 7142, HD 175639, SAO 124070, BD +4 3917, WDS 18562+0412B |
constellation | Serpens |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 18h 56min 14,6sec | DEC: +4° 12' 7'' | ||
position (2001,18) | RA: 18h 56min 19sec | DEC: +4° 12' 13'' | ||
position (B1900) | RA: 18h 51min 16,3sec | DEC: +4° 4' 19'' | ||
proper motion (J2000) | RA: 0,049 arcsec/a | DEC: 0,026 arcsec/a | ||
radial velocity | -53 km/s | |||
rotational velocity | 196 km/s (uncertain) (variable) | |||
trigonometric parallax | 0,03 arcsec | |||
galactic coordinates | longitude: 37,22° | latitude: 0,85° |
note (category: dynamical parallaxes): | 0.019". |
magnitude
visual magnitude | 4,98 (V on UBV Johnson system) |
spectral / color information
spectral class | A5Vn |
B-V-magnitude | 0,2 |
U-B-magnitude | 0,08 |
R-I-magnitude |
double/multiple star system information
number of components of multiple star system | 3 |
separation | 22,2 arcsec |
mag difference (of double or brightest multiple) | 0,4 |
component ID | AB |
note (category: double and multiple data): | Binary with HR 7141. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 18h 56min 14,668sec | DEC: +4° 12' 7,59'' | ±0,35 arcsec | source: 17 |
position (2001,18) | RA: 18h 56min 19sec | DEC: +4° 12' 14'' | JD: 2451975,78 | |
proper motion (J2000) | RA: 0,0037 arcsec/a | DEC: 0,028 arcsec/a | source: 25 | |
radial velocity | -53 km/s | source: 25 | ||
trigonometric parallax | 0,03 arcsec | ±0,003 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 37,22° | latitude: 0,85° |
magnitude:
visual | 4,98 (observed) | source: 25 |
photovisual | 5,4 | source: 2 |
photographic | 5,5 | source: 16 |
spectral information:
spectral class | A5 | source: 96 | |
Morgan-Keenan | A5Vn | source: 25 | |
B-magnitude | 5,18 ±0,05 | B-V-magnitude | 0,2 |
U-magnitude | 5,25 ±0,05 | U-B-magnitude | 0,07 |
double/multiple star system information:
separation between brightest and second brightest component | 26 arcsec |
magnitude difference between brightest and second brightest component | 2,9 |
position angle | 58 ° |
component | magnitude | spectral class | catalogue(s)/name(s) |
A | 4,61 | A5 | Alya, q1Serpentis, 63 Ser, HR 7141, HD 175638, SAO 124068 |
B | 4,98 | A5 | q2Serpentis, 63 Ser, HR 7142, HD 175639, SAO 124070 |
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: 18h 53min 45,42sec | DEC: +4° 8' 7,7'' | ±0,019 arcsec |
position (2001,18) | RA: 18h 56min 18sec | DEC: +4° 12' 12'' | JD: 2451975,78 |
position (J2000) | RA: 18h 56min 14,638sec | DEC: +4° 12' 7,23'' | |
proper motion B1950 (FK4) | RA: 0,0031 arcsec/a | DEC: 0,027 arcsec/a | ±0,003 arcsec/a in RA ±0,003 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0,0033 arcsec/a | DEC: 0,026 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 5,4 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
spectral class | A5 |
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: 25993 |
Durchmusterung | BD+04 3917 |
Boss General Catalogue | 25993 |
Henry Draper Catalogue | 175639 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
position (J2000) | RA: 18h 56,2min | DEC: +4° 12' |
proper motion (J2000) | RA: 0,049 arcsec/a | DEC: 0,031 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 | 1822 | often | 104° | 21,6'' | 4,62 | 4,98 | A5V A5Vn | STF2417 |
1984 | - | 22,3'' | ||||||
BC | 1927 | 2 | 56° | 14,1'' | 4,98 | 7,9 | A5Vn | STF2417 |
1954 | 58° | 26'' |
discoverer information:
discoverer code | discoverer | reference |
STF2417 | Struve, F.G.W. | - |
notes:
note | Theta (1) Ser. B is BD+04@3917, Theta (2) Ser. |