HN Pegasi
catalogues and names
catalogues and names | HN Peg, HR 8314, HD 206860, SAO 107364, BD +14 4668, FK5: 3737 |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 21h 44min 31.3sec | DEC: +14° 46' 19'' | ||
position (2000.72) | RA: 21h 44min 33sec | DEC: +14° 46' 31'' | ||
position (B1900) | RA: 21h 39min 42sec | DEC: +14° 18' 58'' | ||
proper motion (J2000) | RA: 0.234 arcsec/a | DEC: -0.119 arcsec/a | ||
radial velocity | -19 km/s note: suspected variable radial velocity |
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rotational velocity | 11 km/s (uncertain) (variable) | |||
trigonometric parallax | 0.065 arcsec | |||
galactic coordinates | longitude: 69.86° | latitude: -28.27° |
magnitude
visual magnitude | 5.94 (V on UBV Johnson system) |
spectral / color information
spectral class | G0V |
B-V-magnitude | 0.59 |
U-B-magnitude | 0.04 |
variability information
variable star identification | HN Peg |
note (category: variability): | Amp. 0.02V, 24.90d. Var. due to star spots? Period corresponds to period of rotation. Variable H and K emission indicates chromospheric activity. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 21h 44min 31.331sec | DEC: +14° 46' 18.91'' | ±0.2 arcsec | source: 52 |
position (2000.72) | RA: 21h 44min 33sec | DEC: +14° 46' 31'' | JD: 2451809.16 | |
proper motion (J2000) | RA: 0.016 arcsec/a | DEC: -0.116 arcsec/a | source: 25 | |
radial velocity | -19 km/s | source: 25 | ||
trigonometric parallax | 0.065 arcsec | ±0.006 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 69.87° | latitude: -28.27° |
magnitude:
visual | 5.94 (observed) | source: 25 |
photovisual | 6.1 | source: 2 |
photographic | 6.1 | source: 16 |
spectral information:
spectral class | G0 | source: 96 | |
Morgan-Keenan | G0V | source: 25 | |
B-magnitude | 6.53 ±0.05 | B-V-magnitude | 0.59 |
U-magnitude | 6.57 ±0.05 | U-B-magnitude | 0.04 |
variability information:
variability type | 440 |
var. amplitude | 0.03 |
var. period | 24.9 |
var. epoch | 2440821 22. August 1970, 12:00:00 UT |
next max light | 2451826.8 9. October 2000, 07:12:00 UT |
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 | |
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 | |
52 | PPMN-HP subset |
PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
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: 21h 42min 6.713sec | DEC: +14° 32' 36.92'' | ±0.089 arcsec |
position (2000.72) | RA: 21h 44min 33sec | DEC: +14° 46' 38'' | JD: 2451809.16 |
position (J2000) | RA: 21h 44min 31.59sec | DEC: +14° 46' 21.49'' | |
proper motion B1950 (FK4) | RA: 0.0183 arcsec/a | DEC: -0.089 arcsec/a | ±0.018 arcsec/a in RA ±0.016 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0.0184 arcsec/a | DEC: -0.092 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 6.1 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
spectral class | G0 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
source catalogue | GC, catalogue number: 30443 |
Durchmusterung | BD+14 4668 |
Boss General Catalogue | 30443 |
Henry Draper Catalogue | 206860 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 21h 42min 6.7sec | DEC: +14° 32' 37'' |
variability informations:
variability type | BY | rotating variable star |
magnitute at max. brightness | 5.92 | |
magnitute at min. brightness | 5.95 | |
photometric system | visual, photovisual or Johnson's V | |
epoch for maximum light [JD] | 2440821.48 22. August 1970, 23:31:12 UT |
|
period [d] | 24.9 | |
next maximum light [JD] | 2451827.28 9. October 2000, 18:43:12 UT |
spectral information
spectral class | G0V |
references
to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
ID in the GCVS catalogue | 62/214 |
constellation | Pegasus |
notes on existence | The star is equivalent to '0620215 HO'. |
There are notes in published catalog. |
variability type description
variability type | description |
BY | BY Draconis-type variables, which are emission-line dwarfs of dKe-dMe spectral type showing quasiperiodic light changes with periods from a fraction of a day to 120 days and amplitudes from several hundredths to 0.5 mag in V. The light variability is caused by axial rotation of a star with a variable degree of nonuniformity of the surface brightness (spots) and chromospheric activity. Some of these stars also show flares similar to those of UV Cet stars, and in those cases they also belong to the latter type and are simultaneously considered eruptive variables. |