r Herculis
catalogues and names
| catalogues and names | r Her, 75 Her, HR 6484, HD 157778, SAO 66000, BD +37 2878 B, WDS 17237+3709B |
| constellation | Hercules |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 17h 23min 40,7sec | DEC: +37° 8' 48'' | ||
| position (2001,21) | RA: 17h 23min 44sec | DEC: +37° 8' 44'' | ||
| position (B1900) | RA: 17h 20min 13,6sec | DEC: +37° 14' 19'' | ||
| proper motion (J2000) | RA: -0,041 arcsec/a | DEC: 0,004 arcsec/a | ||
| radial velocity | -19 km/s | |||
| rotational velocity | 190 km/s (uncertain) (variable) | |||
| trigonometric parallax | -0,002 arcsec | |||
| galactic coordinates | longitude: 61,44° | latitude: 32,71° | ||
| note (category: dynamical parallaxes): | 0.010". |
magnitude
| visual magnitude | 5,47 (original HR magnitude) |
spectral / color information
| spectral class | A0Vn |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 4,2 arcsec |
| mag difference (of double or brightest multiple) | 1 |
| component ID | AB |
| note (category: double and multiple data): | Binary with HR 6485, q.v. Another companion with sep. 0.29" seen on 1981.47 (McAlister and Hartkopf). Unresolved on 1985.25 (Bonneau et al.). |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 17h 23min 40,675sec | DEC: +37° 8' 48,21'' | ±1,24 arcsec | source: 29 |
| position (2001,21) | RA: 17h 23min 44sec | DEC: +37° 8' 44'' | JD: 2451987,37 | |
| proper motion (J2000) | RA: -0,0034 arcsec/a | DEC: 0,004 arcsec/a | source: 25 | |
| radial velocity | -19 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 61,44° | latitude: 32,71° | ||
magnitude:
| visual | 5,49 (observed) | source: 25 |
| photovisual | 5,5 | source: 2 |
| photographic | 5,5 | source: 2 |
spectral information:
| spectral class | A0 | source: 29 | |
| Morgan-Keenan | A0Vn | source: 25 | |
| B-magnitude | 5,46 ±0,05 | B-V-magnitude | -0,03 |
| U-magnitude | 5,42 ±0,05 | U-B-magnitude | -0,04 |
double/multiple star system information:
| separation between brightest and second brightest component | 0,2 arcsec |
| position angle | 2 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,56 | A0 | r Herculis, 75 Her, HR 6485, HD 157779, SAO 66001 |
| B | 5,49 | A0 | r Herculis, 75 Her, HR 6484, HD 157778, SAO 66000 |
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 | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (B1950) | RA: 17h 21min 57,051sec | DEC: +37° 11' 29,8'' | ±0,033 arcsec |
| position (2001,21) | RA: 17h 23min 43sec | DEC: +37° 8' 44'' | JD: 2451987,37 |
| position (J2000) | RA: 17h 23min 40,675sec | DEC: +37° 8' 48,21'' | |
| proper motion B1950 (FK4) | RA: -0,0038 arcsec/a | DEC: 0,003 arcsec/a | ±0,004 arcsec/a in RA ±0,006 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0034 arcsec/a | DEC: 0,004 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,5 (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: 23543 |
| Durchmusterung | BD+37 2878B |
| Boss General Catalogue | 23543 |
| Henry Draper Catalogue | 157778 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 17h 23,7min | DEC: +37° 9' |
| proper motion (J2000) | RA: -0,041 arcsec/a | DEC: 0,001 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 | 1981 | 3 | 22° | 0,3'' | 4,56 | - | B9.5III | MCA 48 |
| 1991 | 2° | 0,2'' | ||||||
| Aa-B | 1822 | often | 306° | 3,7'' | 4,5 | 5,5 | - | STF2161 |
| 1980 | 317° | 4,2'' | ||||||
| Aa-C | 1911 | 2 | 223° | 119,5'' | 4,5 | 13,3 | - | STF2161 |
discoverer information:
| discoverer code | discoverer | reference |
| MCA 48 | McAlister, H.A. | - |
| STF2161 | Struve, F.G.W. | - |
notes:
| note | Aa: Rho Her. Suspected of variable velocity, and resolved by speckle interferometry. Aa-B: Proper motion of B -040 000. |