4 Aquilae

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

position, motion, parallax:

position (J2000)	RA: 18h 44min 49.9sec	DEC: +2° 3' 36''
position (B1900)	RA: 18h 39min 47.1sec	DEC: +1° 57' 30''
proper motion (J2000)	RA: 0.009 arcsec/a	DEC: -0.018 arcsec/a
radial velocity	-13 km/s note: variable radial velocity
rotational velocity	300 km/s (uncertain) (variable)
trigonometric parallax	0.005 arcsec
galactic coordinates	longitude: 34.01°	latitude: 2.41°

magnitude

visual magnitude

5.02
(V on UBV Johnson system)

spectral / color information

note (category: spectra):

Shell star. H alpha emission.

variability information

variable star identification

11290

note (category: variability):

Gamma Cas?, 5.00 - 5.05V.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

magnitude:

spectral information:

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
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: 18h 42min 18.447sec	DEC: +2° 0' 27.21''	ą0.018 arcsec
position (J2000)	RA: 18h 44min 49.931sec	DEC: +2° 3' 35.72''
proper motion B1950 (FK4)	RA: 0.0004 arcsec/a	DEC: -0.017 arcsec/a	ą0.003 arcsec/a in RA ą0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0006 arcsec/a	DEC: -0.018 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	B5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 18h 42min 18.4sec

DEC: +2° 0' 27''

variability informations:

variability type	GCAS:	eruptive variable star
magnitute at max. brightness	5
magnitute at min. brightness	5.05
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

references

to a study

192377D (designation: +1 3766)

variability type description

variability type	description
GCAS	Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones. The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V.

catalogues and names	NSV 11290, 4 Aql, HR 7040, HD 173370, SAO 123879, BD +1 3766
constellation	Aquila