d Serpentis
catalogues and names
| catalogues and names | d Ser, del Ser, 13 Ser, HR 5789, HD 138918, SAO 101624, BD +11 2821 A, WDS 15348+1032A |
| constellation | Serpens |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 34min 48.1sec | DEC: +10° 32' 21'' | ||
| position (2000.73) | RA: 15h 34min 50sec | DEC: +10° 32' 12'' | ||
| position (B1900) | RA: 15h 30min 1.4sec | DEC: +10° 52' 23'' | ||
| proper motion (J2000) | RA: -0.074 arcsec/a | DEC: 0.012 arcsec/a | ||
| radial velocity | -42 km/s note: variable radial velocity |
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| rotational velocity | 80 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.021 arcsec | |||
| galactic coordinates | longitude: 17.59° | latitude: 48.19° | ||
| note (category: dynamical parallaxes): | 0.022". |
magnitude
| visual magnitude | 3.8 (V on UBV Johnson system) |
spectral / color information
| spectral class | F0IV |
| B-V-magnitude | 0.26 |
| U-B-magnitude | 0.12 |
| R-I-magnitude |
variability information
| variable star identification | Del Ser |
| note (category: variability): | Delta Sct 4.20 - 4.25V, 0.134d. Fourier analysis of 1975 and 1979 data shows frequencies of 6.4227 and 7.8869 cycles/d or periods 0.1557 and 0.1268d. |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 3.9 arcsec |
| mag difference (of double or brightest multiple) | 1.1 |
| component ID | AB |
| note (category: double and multiple data): | Binary with HR 5788. CD 13.5, 14.0 sep. 4" at 65" from A, optical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 34min 48.142sec | DEC: +10° 32' 19.04'' | ±0.43 arcsec | source: 16 |
| position (2000.73) | RA: 15h 34min 50sec | DEC: +10° 32' 10'' | JD: 2451810.88 | |
| proper motion (J2000) | RA: -0.0051 arcsec/a | DEC: 0.009 arcsec/a | source: 25 | |
| radial velocity | -42 km/s | source: 25 | ||
| trigonometric parallax | 0.021 arcsec | ±0.002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 17.59° | latitude: 48.19° | ||
magnitude:
| visual | 3.8 (observed) | source: 25 |
| photovisual | 4.2 | source: 2 |
| photographic | 4.5 | source: 2 |
spectral information:
| spectral class | F0 | source: 96 | |
| Morgan-Keenan | F0IV | source: 25 | |
| B-magnitude | 4.06 ±0.05 | B-V-magnitude | 0.26 |
| U-magnitude | 4.18 ±0.05 | U-B-magnitude | 0.12 |
variability information:
| variability type | 150 |
| var. period | 0.13 |
double/multiple star system information:
| separation between brightest and second brightest component | 4.3 arcsec |
| magnitude difference between brightest and second brightest component | 1 |
| position angle | 175 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 3.8 | F0 | d Serpentis, 13 Ser, HR 5789, HD 138918, SAO 101624 |
| B | 3.8 | F0 | d Serpentis, 13 Ser, HR 5788, HD 138917, SAO 101623 |
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 | |
| 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 | |
| 27 | Catalog of Red Magnitudes (CRM) |
| 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: 15h 32min 24.681sec | DEC: +10° 42' 17.82'' | ±0.023 arcsec |
| position (2000.73) | RA: 15h 34min 51sec | DEC: +10° 32' 12'' | JD: 2451810.88 |
| position (J2000) | RA: 15h 34min 48.146sec | DEC: +10° 32' 20.95'' | |
| proper motion B1950 (FK4) | RA: -0.0051 arcsec/a | DEC: 0.01 arcsec/a | ±0.004 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.005 arcsec/a | DEC: 0.012 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.2 (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: 20942 |
| Durchmusterung | BD+11 2821A |
| Boss General Catalogue | 20942 |
| Henry Draper Catalogue | 138918 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 15h 34.8min | DEC: +10° 32' |
| proper motion (J2000) | RA: -0.071 arcsec/a | DEC: -0.014 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 | 1822 | often | 201° | 2.4'' | 4.2 | 5.2 | F0IV | STF1954 |
| 1990 | 175° | 4.3'' | ||||||
| AC | 1911 | 3 | 12° | 65.8'' | 4.2 | 14.7 | - | STF1954 |
| 1959 | 14° | 65.2'' | ||||||
| CD | 1911 | 1 | 339° | 4.4'' | 14.7 | 15.2 | - | STF1954 |
discoverer information:
| discoverer code | discoverer | reference |
| STF1954 | Struve, F.G.W. | - |
notes:
| note | Delta Ser. A premature orbit has been computed. The primary is a Delta Scuti-type variable. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 15h 30min | DEC: +10° 52' |
magnitudes, spectral classes, orbital elements:
| author: | J. Hopmann |
| magnitude of component A: | 4.2 |
| magnitude of component B: | 4.2 |
| spectral class component B: | F0IV |
| spectral class component B: | F0IV |
| period [y]: | 3168 |
| semi-major axis [arcsec]: | 5.843 |
| inclination [deg]: | 112.6 |
| node [deg]: | 166.8 |
| equinox of node: | 1900 |
| eccentricity: | 0.31 |
| time of periastron passage: | 1700 |
| dates of ephemeris: | 1960-2000 |
| grade: | indeterminate |
| reference: | Mitt. Wien No. 13, 1973. |
| notes | Star A is a Delta Scuti type variable. A very faint pair CD (mag. about 14 estimated by Burnham, 4") is 65" distant and may be physical. |