n Serpentis
| catalogues and names | n Ser, 53 Ser, HR 6446, HD 156928, SAO 160479, FK5: 3376, WDS 17208-1251A |
| constellation | Serpens |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 17h 20min 49,7sec | DEC: -12° 50' 49'' |
| position (J1900) | RA: 17h 15min 12,1sec | DEC: -12° 44' 44'' |
| proper motion (J2000) | RA: 0,042 arcsec/a | DEC: 0,004 arcsec/a |
| radial velocity | 5 km/s note: variable radial velocity |
|
| rotational velocity | 115 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,028 arcsec | |
magnitude
| visual magnitude | 4,33 (V on UBV Johnson system) |
spectral / color information
| spectral class | A2V |
| B-V-magnitude | 0,03 |
| U-B-magnitude | 0,05 |
| R-I-magnitude | 0 |
double/multiple star system information
| separation | 46,3 arcsec |
| mag difference (of double or brightest multiple) | 4,8 |
miscellaneous information
| note (category: group membership): | Possible Eggen group with HR 63, q.v. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 17h 20min 49,651sec | DEC: -12° 50' 48,93'' | ±0,19 arcsec | source: 16 |
| proper motion (J2000) | RA: 0,0026 arcsec/a | DEC: -0,002 arcsec/a | source: 25 | |
| radial velocity | 5 km/s | source: 25 | ||
| trigonometric parallax | 0,028 | ±0,003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 10,63° | latitude: 13,46° | ||
| GCI unit vector (J2000) | X: -0,165833 | Y: -0,960761 | Z: -0,222347 | |
magnitude:
| visual | 4,33 (observed) | source: 25 |
| photovisual | 4 | source: 16 |
| photographic | 4,4 | source: 2 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | A2V | source: 25 | |
| B-magnitude | 4,36 ±0,05 | B-V-magnitude | 0,03 |
| U-magnitude | 4,41 ±0,05 | U-B-magnitude | 0,05 |
double/multiple star system information:
| separation between brightest and second brightest component | 46,3 arcsec |
| magnitude difference between brightest and second brightest component | 4,85 |
| position angle | 28 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,33 | A0 | n Serpentis, 53 Ser, HR 6446, HD 156928, SAO 160479 |
| B | 8,7 | - |
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 | |
| 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 | |
| 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 (J1950) | RA: 17h 18min 0,746sec | DEC: -12° 47' 52,08'' | ±0,019 arcsec |
| position (J2000) | RA: 17h 20min 49,657sec | DEC: -12° 50' 48,26'' | |
| proper motion J1950 (FK4) | RA: 0,0029 arcsec/a | DEC: 0,004 arcsec/a | ±0,003 arcsec/a in RA ±0,003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0031 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 | 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: 23424 |
| Durchmusterung | BD-12 4722 |
| Boss General Catalogue | 23424 |
| Henry Draper Catalogue | 156928 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 17h 20,8min | DEC: -12° 51' |
| proper motion (J2000) | RA: 0,042 arcsec/a | DEC: 0,004 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 |
| - | 1863 | 9 | 32° | 48,1'' | 4,33 | 9,18 | A2V | SHJ 247 |
| 1959 | 28° | 46,3'' |
discoverer information:
| discoverer code | discoverer | reference |
| SHJ 247 | South & Herschel | - |
notes:
| note | Nu Ser. B is BD-12@4724. Proper motion of B +021 +008. |