99 Herculis
catalogues and names
| catalogues and names | 99 Her, HR 6775, HD 165908, SAO 66648, BD +30 3128, WDS 18070+3034A |
| constellation | Hercules |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 18h 7min 1.5sec | DEC: +30° 33' 43'' | ||
| position (B1900) | RA: 18h 3min 13.7sec | DEC: +30° 32' 51'' | ||
| proper motion (J2000) | RA: -0.094 arcsec/a | DEC: 0.071 arcsec/a | ||
| radial velocity | 1 km/s note: spectroscopic binaries |
|||
| rotational velocity | 3 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.06 arcsec | |||
| galactic coordinates | longitude: 56.97° | latitude: 22.3° | ||
| note (category: dynamical parallaxes): | 0.060". |
magnitude
| visual magnitude | 5.04 (V on UBV Johnson system) |
spectral / color information
| spectral class | F7V |
| B-V-magnitude | 0.52 |
| U-B-magnitude | -0.09 |
| R-I-magnitude |
| note (category: spectra): | Metal deficient, calcium rich. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 1.7 arcsec |
| mag difference (of double or brightest multiple) | 3.4 |
| component ID | AB |
| note (category: double and multiple data): | AB 5.10 F7V, 8.50 K4V, 55.8y, a = 1.00". |
| note (category: spectroscopic binaries): | Astrometric binary unresolved by speckle interferometry. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 18h 7min 1.579sec | DEC: +30° 33' 43.52'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: -0.0067 arcsec/a | DEC: 0.079 arcsec/a | source: 25 | |
| radial velocity | 1 km/s | source: 25 | ||
| trigonometric parallax | 0.06 arcsec | ±0.006 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 56.97° | latitude: 22.3° | ||
magnitude:
| visual | 5.04 (observed) | source: 25 |
| photovisual | 5.2 | source: 2 |
| photographic | 5.7 | source: 16 |
spectral information:
| spectral class | F8 | source: 96 | |
| Morgan-Keenan | F7V | source: 25 | |
| B-magnitude | 5.56 ±0.05 | B-V-magnitude | 0.52 |
| U-magnitude | 5.47 ±0.05 | U-B-magnitude | -0.09 |
double/multiple star system information:
| magnitude difference between brightest and second brightest component | 3.3 |
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 5min 7.529sec | DEC: +30° 33' 12.96'' | ±0.022 arcsec |
| position (J2000) | RA: 18h 7min 1.517sec | DEC: +30° 33' 43.12'' | |
| proper motion B1950 (FK4) | RA: -0.0075 arcsec/a | DEC: 0.071 arcsec/a | ±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0073 arcsec/a | DEC: 0.071 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 | F8 |
| 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: 24700 |
| Durchmusterung | BD+30 3128 |
| Boss General Catalogue | 24700 |
| Henry Draper Catalogue | 165908 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 18h 7min | DEC: +30° 34' |
| proper motion (J2000) | RA: -0.086 arcsec/a | DEC: 0.079 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 | 1859 | often | ° | '' | 5.1 | 8.4 | F7V | AC 15 |
| AC | 1912 | 3 | 53° | 93.4'' | 5.1 | 10.7 | - | AC 15 |
| 1982 | 58° | 96'' | ||||||
| AD | 1982 | 1 | 102° | 138.8'' | 5.1 | 11.1 | - | AC 15 |
| AE | 1982 | 1 | 77° | 167.9'' | 5.1 | 10.8 | - | AC 15 |
| AF | 1982 | 1 | 165° | 159.7'' | 5.1 | 10.7 | - | AC 15 |
| AG | 1982 | 1 | 359° | 179'' | 5.1 | 10.7 | - | AC 15 |
discoverer information:
| discoverer code | discoverer | reference |
| AC 15 | - | - |
notes:
| note | 99 Her. P = 55.6yr., a = 1.08", motion direct. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 18h 3.2min | DEC: +30° 33' |
magnitudes, spectral classes, orbital elements:
| author: | W.D. Heintz |
| date of observation: | 1968 |
| magnitude of component A: | 5.1 |
| magnitude of component B: | 5.1 |
| spectral class component B: | F7V |
| spectral class component B: | F7V |
| period [y]: | 55.8 |
| semi-major axis [arcsec]: | 1 |
| inclination [deg]: | 32 |
| node [deg]: | 218.7 (ascending) |
| equinox of node: | 2000 |
| eccentricity: | 0.74 |
| time of periastron passage: | 1941.8 |
| grade: | definitive |
| reference: | Astron. J. 77, 160; 1972. |
| notes | Identification of the ascending node is not very certain. |
| other name(s) | AC 15, 99 Her |