a2Herculis
catalogues and names
| catalogues and names | a2Her, 64 Her, HR 6407, HD 156015, SAO 102681, BD +14 3207 B, WDS 17146+1423B |
| constellation | Hercules |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 17h 14min 39,2sec | DEC: +14° 23' 24'' | ||
| position (2001,21) | RA: 17h 14min 42sec | DEC: +14° 23' 19'' | ||
| position (B1900) | RA: 17h 10min 5,5sec | DEC: +14° 30' 13'' | ||
| proper motion (J2000) | RA: -0,003 arcsec/a | DEC: 0,045 arcsec/a | ||
| radial velocity | -37 km/s note: spectroscopic binaries note: orbital data avaible |
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| rotational velocity | =<50 km/s (uncertain) (variable) | |||
| trigonometric parallax | -0,002 arcsec | |||
| galactic coordinates | longitude: 35,53° | latitude: 27,82° | ||
| note (category: dynamical parallaxes): | 0.008". |
magnitude
| visual magnitude | 5,39 (original HR magnitude) |
spectral / color information
| spectral class | G5III+F2V |
| note (category: colors): | IR source. |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 4,9 arcsec |
| mag difference (of double or brightest multiple) | 2,2 |
| component ID | AB |
| note (category: double and multiple data): | See HR 6406. |
| note (category: spectroscopic binaries): | 51.578d, K 36.1k/s, V0 -38.4k/s, asini 25.6. Sp. of fainter comp. of the SB, A3V, may be a collapsed star. Masses 4.1, 2.5 Suns. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 17h 14min 39,219sec | DEC: +14° 23' 24,09'' | ±1,24 arcsec | source: 29 |
| position (2001,21) | RA: 17h 14min 42sec | DEC: +14° 23' 19'' | JD: 2451987,37 | |
| proper motion (J2000) | RA: -0,0002 arcsec/a | DEC: 0,045 arcsec/a | source: 25 | |
| radial velocity | -37 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 35,54° | latitude: 27,82° | ||
magnitude:
| visual | 5,39 (observed) | source: 25 |
| photovisual | 5,4 | source: 2 |
| photographic | 6,7 | source: 2 |
spectral information:
| spectral class | M0 | source: 96 | |
| Morgan-Keenan | G5III+F2V | source: 25 | |
double/multiple star system information:
| separation between brightest and second brightest component | 21,1 arcsec |
| magnitude difference between brightest and second brightest component | 12 |
| position angle | 330 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 2,7 | Mb | Rasalgethi, a1Herculis, 64 Her, HR 6406, HD 156014, SAO 102680 |
| B | 5,39 | M0 | a2Herculis, 64 Her, HR 6407, HD 156015, SAO 102681 |
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 | |
| 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 | |
| 29 | SAOJ2000 |
| SAO on FK5 at J2000, 1989 | |
| 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: 17h 12min 22,274sec | DEC: +14° 26' 43,71'' | ±0,024 arcsec |
| position (2001,21) | RA: 17h 14min 42sec | DEC: +14° 23' 17'' | JD: 2451987,37 |
| position (J2000) | RA: 17h 14min 39,219sec | DEC: +14° 23' 24,09'' | |
| proper motion B1950 (FK4) | RA: -0,0003 arcsec/a | DEC: 0,043 arcsec/a | ±0,003 arcsec/a in RA ±0,004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0002 arcsec/a | DEC: 0,045 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 | Mb |
| 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: 23278 |
| Durchmusterung | BD+14 3207B |
| Boss General Catalogue | 23278 |
| Henry Draper Catalogue | 156015 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 17h 14,6min | DEC: +14° 23' |
| proper motion (J2000) | RA: -0,012 arcsec/a | DEC: 0,037 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 |
| Aa | 1986 | 3 | 86° | 0,2'' | 3,5 | - | M5Ib-II | CHR 139 |
| 1991 | 231° | - | ||||||
| Aa-B | 1822 | often | 118° | 4,7'' | 3,5 | 5,4 | - | STF2140 |
| 1993 | 106° | 4,8'' | ||||||
| Aa-C | 1888 | 6 | 336° | 23,5'' | 3,5 | 15,5 | M5Ib-II | AGC 16 |
| 1934 | 330° | 21,1'' | ||||||
| Aa-D | 1878 | - | 39° | 85,4'' | 3,5 | 11,1 | M5Ib-II | STF2140 |
| 1960 | - | 81,2'' |
discoverer information:
| discoverer code | discoverer | reference |
| CHR 139 | - | - |
| STF2140 | Struve, F.G.W. | - |
| AGC 16 | - | - |
notes:
| note | Alpha Her. A premature orbit has been computed. A is a semiregular variable. B is a spectroscopic binary, spectrum composite; G5III+F2V. Proper motion of B -006 +031. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 17h 10,1min | DEC: +14° 30' |
magnitudes, spectral classes, orbital elements:
| author: | P. Baize |
| date of observation: | 1970 |
| magnitude of component A: | 3,5 |
| magnitude of component B: | 3,5 |
| spectral class component B: | M5Ib |
| spectral class component B: | M5Ib |
| period [y]: | 3600 |
| semi-major axis [arcsec]: | 4,68 |
| inclination [deg]: | 155,8 |
| node [deg]: | 119,6 |
| eccentricity: | 0 |
| time of periastron passage: | 1835 |
| grade: | indeterminate |
| reference: | Circ. Inf. No. 76, 1978. |
| notes | Star A is an irregular variable, and B is a single-lined spectroscopic binary, P = 51.58 d. Two faint stars at 20" and 80" are optical. |