catalogues and names

Smithsonian Astrophysical Observatory Star Catalog

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names

V1154 Cyg, SAO 48854, BD +42 3471

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (B1950)	RA: 19h 46min 37.438sec	DEC: +43° 0' 4.95''	±0.039 arcsec
position (2000.72)	RA: 19h 48min 16sec	DEC: +43° 7' 44''	JD: 2451806.31
position (J2000)	RA: 19h 48min 15.57sec	DEC: +43° 7' 39.05''
proper motion B1950 (FK4)	RA: 0.0007 arcsec/a	DEC: 0.028 arcsec/a	±0.021 arcsec/a in RA ±0.013 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0011 arcsec/a	DEC: 0.026 arcsec/a
source of proper motion data	Determined by comparison of catalog and AGK1

magnitude:

visual	8.8 (accuracy: 1 decimal)
source of visual magnitude data	Determined by source catalog.
photographic	10.3 (accuracy: 1 decimal)
source of photographic magnitude data	Determined by source catalog.

spectral information:

source of spectral data

Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	AGK2, Volume 6, catalogue number: 1729
Durchmusterung	BD+42 3471

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 19h 46min 37.4sec

DEC: +43° 0' 5''

variability informations:

variability type	CEP	pulsating variable star
magnitute at max. brightness	8.95
magnitute at min. brightness	9.37
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2437706.721 11. February 1962, 05:18:14 UT
period [d]	4.925537
next maximum light [JD]	2451808.533431 21. September 2000, 00:48:08 UT
rising time	31 % of period

spectral information

spectral class

G2

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	Vol. II GCVS

miscanellous

ID in the GCVS catalogue	31/1154
constellation	Cygnus
notes on existence	The star is equivalent to '0311155 V1155'.

variability type description

variability type

description

CEP

Cepheids. Radially pulsating, high luminosity (classes Ib-II) variables with periods in the range of 1-135 days and amplitudes from several hundredths to 2 mag in V (in the B band, the amplitudes are greater). Spectral type at maximum light is F; at minimum, the types are G-K. The longer the period of light variation,the later is the spectral type. The maximum of the surface-layer expansion velocity almost coinciding with maximum light.