V0637 Herculis
catalogues and names
| catalogues and names | V0637 Her, 52 Her, HR 6254, HD 152107, SAO 46305, BD +46 2220, WDS 16492+4559A |
| constellation | Hercules |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 16h 49min 14.2sec | DEC: +45° 59' 0'' | ||
| position (2000.72) | RA: 16h 49min 15sec | DEC: +45° 58' 56'' | ||
| position (B1900) | RA: 16h 46min 18.5sec | DEC: +46° 9' 27'' | ||
| proper motion (J2000) | RA: 0.026 arcsec/a | DEC: -0.055 arcsec/a | ||
| radial velocity | -1 km/s note: variable radial velocity |
|||
| rotational velocity | 31 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.01 arcsec | |||
| galactic coordinates | longitude: 71.61° | latitude: 39.96° | ||
| note (category: dynamical parallaxes): | 0.024". |
magnitude
| visual magnitude | 4.82 (V on UBV Johnson system) |
spectral / color information
| spectral class | A2VpSrCrEu |
| B-V-magnitude | 0.09 |
| U-B-magnitude | 0.04 |
| R-I-magnitude |
| note (category: spectra): | Oxygen deficient relative to magnesium. Magnetic star, also classified A3VpSrCrEuMn. |
variability information
| variable star identification | V637 Her |
| note (category: variability): | ADS 10227A, Alpha CV 4.78 - 4.83V, 3.8567d. K line varies, 3.88d. |
double/multiple star system information
| number of components of multiple star system | 5 |
| separation | 1.8 arcsec |
| mag difference (of double or brightest multiple) | 4.6 |
| component ID | AxBC |
| note (category: double and multiple data): | BC 9.0, 9.1, 56.75y, a = 0.267". AxBC physical. |
miscellaneous information
| note (category: group membership): | Sirius group. UMa stream. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 16h 49min 14.215sec | DEC: +45° 58' 59.96'' | ±0.35 arcsec | source: 17 |
| position (2000.72) | RA: 16h 49min 15sec | DEC: +45° 58' 56'' | JD: 2451809.25 | |
| proper motion (J2000) | RA: 0.0022 arcsec/a | DEC: -0.052 arcsec/a | source: 25 | |
| radial velocity | -1 km/s | source: 25 | ||
| trigonometric parallax | 0.01 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 71.61° | latitude: 39.96° | ||
magnitude:
| visual | 4.8 (observed) | source: 31 |
| photovisual | 4.9 | source: 2 |
| photographic | 4.9 | source: 16 |
spectral information:
| spectral class | A2 | source: 96 | |
| Morgan-Keenan | A2VpSrCrEu | source: 25 | |
| B-magnitude | 4.91 ±0.05 | B-V-magnitude | 0.09 |
| U-magnitude | 4.95 ±0.05 | U-B-magnitude | 0.04 |
variability information:
| variability type | 160 |
| var. amplitude | 0.07 |
| var. period | 3.86 |
double/multiple star system information:
| separation between brightest and second brightest component | 1.7 arcsec |
| magnitude difference between brightest and second brightest component | 5.5 |
| position angle | 18 ° |
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 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 31 | CRM' (non-GCVS variable data) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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: 16h 47min 46.246sec | DEC: +46° 4' 10.06'' | ±0.018 arcsec |
| position (2000.72) | RA: 16h 49min 15sec | DEC: +45° 58' 58'' | JD: 2451809.25 |
| position (J2000) | RA: 16h 49min 14.249sec | DEC: +45° 58' 59.82'' | |
| proper motion B1950 (FK4) | RA: 0.0019 arcsec/a | DEC: -0.057 arcsec/a | ±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0025 arcsec/a | DEC: -0.055 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A2p |
| 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: 22662 |
| Durchmusterung | BD+46 2220 |
| Boss General Catalogue | 22662 |
| Henry Draper Catalogue | 152107 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 16h 49.2min | DEC: +45° 59' |
| proper motion (J2000) | RA: 0.023 arcsec/a | DEC: -0.052 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 |
| A-BC | 1878 | 49 | 309° | 1.8'' | 4.9 | 10.4 | A1V | BU 627 |
| 1975 | 18° | 1.7'' | ||||||
| AD | 1881 | 4 | 229° | 67'' | 4.9 | 11.9 | A1V | BU 627 |
| 1984 | 235° | 64.9'' | ||||||
| AE | 1881 | 3 | 268° | 43.3'' | 4.9 | 11.9 | A1V | BU 627 |
| 1962 | 270° | 45.1'' | ||||||
| BC | 1908 | 32 | ° | '' | 9.5 | 9.6 | - | A 1866 |
discoverer information:
| discoverer code | discoverer | reference |
| BU 627 | Burnham, S.W. | - |
| A 1866 | Aitken, R.G. | - |
notes:
| note | 52 Her. A is an Alpha CVn-type variable, V637 Her. BC: P = 57yr, a = 0.27", motion direct. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 16h 46.3min | DEC: +46° 9' |
magnitudes, spectral classes, orbital elements:
| author: | G.M. Popovic |
| date of observation: | 1962 |
| magnitude of component A: | 9.8 |
| magnitude of component B: | 9.8 |
| period [y]: | 56.75 |
| semi-major axis [arcsec]: | 0.267 |
| inclination [deg]: | 46.32 |
| node [deg]: | 71.14 |
| eccentricity: | 0.22 |
| time of periastron passage: | 1944 |
| dates of ephemeris: | 1966-1975 |
| grade: | reliable |
| reference: | Bull. Obs. Astron. Beograd 27, 49; 1969. |
| notes | Star A (mag. 4.9, A3p) = 52 Her, an Alpha CVn type variable. BC are in slow direct motion about A at 1.8" separation. A-BC = BU 627. The magnitudes of B and C are quite uncertain. The physical nature of the faint and more distant components D and E is unknown. |