16 Vulpeculae
catalogues and names
| catalogues and names | 16 Vul, HR 7657, HD 190004, SAO 88098, BD +24 3977, WDS 20020+2456 |
| constellation | Vulpecula |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 20h 2min 1.4sec | DEC: +24° 56' 17'' | ||
| position (B1900) | RA: 19h 57min 46.8sec | DEC: +24° 39' 28'' | ||
| proper motion (J2000) | RA: 0.088 arcsec/a | DEC: 0.07 arcsec/a | ||
| radial velocity | -37 km/s note: variable radial velocity |
|||
| rotational velocity | 121 km/s (uncertain) (variable) | |||
| dynamical parallax | 0.004 arcsec | |||
| galactic coordinates | longitude: 63.02° | latitude: -3° | ||
magnitude
| visual magnitude | 5.22 (V on UBV Johnson system) |
spectral / color information
| spectral class | F2III |
| B-V-magnitude | 0.36 |
| U-B-magnitude | 0.09 |
double/multiple star system information
| separation | 0.8 arcsec |
| mag difference (of double or brightest multiple) | 0.3 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 20h 2min 1.448sec | DEC: +24° 56' 16.83'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: 0.0066 arcsec/a | DEC: 0.07 arcsec/a | source: 25 | |
| radial velocity | -37 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 63.02° | latitude: -3° | ||
magnitude:
| visual | 5.22 (observed) | source: 25 |
| photovisual | 5.3 | source: 2 |
| photographic | 5.6 | source: 16 |
spectral information:
| spectral class | F0 | source: 96 | |
| Morgan-Keenan | F2III | source: 25 | |
| B-magnitude | 5.58 ±0.05 | B-V-magnitude | 0.36 |
| U-magnitude | 5.67 ±0.05 | U-B-magnitude | 0.09 |
double/multiple star system information:
| separation between brightest and second brightest component | 0.8 arcsec |
| magnitude difference between brightest and second brightest component | 0.4 |
| position angle | 122 ° |
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: 19h 59min 54.081sec | DEC: +24° 47' 48.51'' | ±0.02 arcsec |
| position (J2000) | RA: 20h 2min 1.434sec | DEC: +24° 56' 16.7'' | |
| proper motion B1950 (FK4) | RA: 0.0064 arcsec/a | DEC: 0.072 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0065 arcsec/a | DEC: 0.07 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | F0 |
| 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: 27768 |
| Durchmusterung | BD+24 3977 |
| Boss General Catalogue | 27768 |
| Henry Draper Catalogue | 190004 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 20h 2min | DEC: +24° 56' |
| proper motion (J2000) | RA: 0.09 arcsec/a | DEC: 0.07 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 |
| - | 1843 | often | 79° | 0.6'' | 5.8 | 6.2 | F2III | STT 395 |
| 1992 | 122° | 0.8'' |
discoverer information:
| discoverer code | discoverer | reference |
| STT 395 | Struve, O. | - |
notes:
| note | 16 Vul. |