delta Aquilae

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

position, motion, parallax:

position (J2000)	RA: 19h 25min 29.9sec	DEC: +3° 6' 53''
position (B1900)	RA: 19h 20min 27.4sec	DEC: +2° 54' 55''
proper motion (J2000)	RA: 0.257 arcsec/a	DEC: 0.082 arcsec/a
radial velocity	-30 km/s note: spectroscopic binaries
rotational velocity	85 km/s (uncertain) (variable)
trigonometric parallax	0.072 arcsec
galactic coordinates	longitude: 39.62°	latitude: -6.13°

magnitude

visual magnitude

3.36
(V on UBV Johnson system)

spectral / color information

spectral class	F3IV
B-V-magnitude	0.32
U-B-magnitude	0.04
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

variability information

variable star identification

12004

note (category: variability):

Delta Sct? Proper motion slightly variable?

double/multiple star system information

number of components of multiple star system	3
separation	108.9 arcsec
mag difference (of double or brightest multiple)	7.5
component ID	AB
note	Worley (1978) update of the IDS

note (category: double and multiple data):

Component A astrometric binary, A* 3.36 F0IV, 3.422y, a = 0.058"; unresolved by speckle interferometry.

note (category: spectroscopic binaries):

0.1571d.

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

position, motion, parallax:

position (J2000)	RA: 19h 25min 29.904sec	DEC: +3° 6' 53.17''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: 0.0172 arcsec/a	DEC: 0.082 arcsec/a		source: 25
radial velocity	-30 km/s			source: 25
trigonometric parallax	0.072 arcsec		±0.007 arcsec	source: 25
galactic coord. (B1950)	longitude: 39.62°	latitude: -6.13°

magnitude:

visual	3.36 (observed)	source: 25
photovisual	3.4	source: 2

spectral information:

spectral class	F0		source: 96
Morgan-Keenan	F3IV		source: 25
B-magnitude	3.68 ±0.05	B-V-magnitude	0.32
U-magnitude	3.72 ±0.05	U-B-magnitude	0.04

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	0.1 arcsec
position angle	130 °

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
15	FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
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
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: 19h 22min 58.597sec	DEC: +3° 0' 48.98''	±0.003 arcsec
position (J2000)	RA: 19h 25min 29.897sec	DEC: +3° 6' 53.21''
proper motion B1950 (FK4)	RA: 0.0169 arcsec/a	DEC: 0.083 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0171 arcsec/a	DEC: 0.082 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.4 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	F0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 730
Durchmusterung	BD+02 3879
Boss General Catalogue	26816
Henry Draper Catalogue	182640

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000)	RA: 19h 25.5min	DEC: +3° 7'
proper motion (J2000)	RA: 0.257 arcsec/a	DEC: 0.082 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	1979	1	130°	0.1''	3.4	-	F3IV	BNU
Aa-B	1879	2	272°	101.3''	3.4	10.9	-	BUP 190
Aa-B	1907	2	271°	108.9''	3.4	10.9	-	BUP 190

discoverer information:

discoverer code	discoverer	reference
BNU	Bonneau et al
BUP 190	-	-

notes:

note	Delta Aql. A is a spectroscopic binary, now resolved by speckle interferometry.

data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)

position:

position (B1900)

RA: 19h 20.5min

DEC: +2° 55'

magnitudes, spectral classes, orbital elements:

author:	V. Osvalds
date of observation:	1955
magnitude of component A:	3.36
magnitude of component B:	3.36
spectral class component B:	F3IV
spectral class component B:	F3IV
period [y]:	3.422
semi-major axis [arcsec]:	0.058
inclination [deg]:	142
node [deg]:	141
eccentricity:	0.4
time of periastron passage:	1958.123
reference:	Astron. J. 63, 222; 1958.

other name(s)

Delta Aql Aa-P

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

position:

position (equinox 1950.0)

RA: 19h 22min 58.6sec

DEC: +3° 0' 49''

variability informations:

magnitute at max. brightness	3.34
magnitute at min. brightness	3.38
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

references

to a study

242089D (designation: DELTA AQL)

miscanellous

There are notes in the published catalog (Kukarkin et al.(1982)).

catalogues and names	d Aql, NSV 12004, 30 Aql, HR 7377, HD 182640, SAO 124603, BD +2 3879, FK5: 730, WDS 19255+0307A
constellation	Aquila