catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

The Washington Visual Double Star Catalog, 1996.0

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

catalogues and names

catalogues and names	DX Aqr, 29 Aqr, HR 8396, HD 209278, SAO 164830, BD -17 6422 A, WDS 22024-1658B
constellation	Aquarius

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

position, motion, parallax:

position (J2000)	RA: 22h 2min 26.6sec	DEC: -16° 57' 51''
position (B1900)	RA: 21h 56min 58.3sec	DEC: -17° 26' 46''
proper motion (J2000)	RA: 0.015 arcsec/a	DEC: 0.001 arcsec/a
radial velocity	15 km/s note: spectroscopic binaries note: orbital data avaible
dynamical parallax	0.006 arcsec
galactic coordinates	longitude: 38.54°	latitude: -49.74°

magnitude

visual magnitude

6.37 (V on UBV Johnson system)

spectral / color information

spectral class	A2V+K0III
B-V-magnitude	0.42

variability information

variable star identification

DX Aqr

note (category: variability):

ADS 15562A, EA 6.37 - 6.78V, 0.9450132d.

double/multiple star system information

number of components of multiple star system	3
separation	3.6 arcsec
mag difference (of double or brightest multiple)	0.1
component ID	AB

note (category: double and multiple data):

Component B, 7.2v, at 3.7" variously classified G2V, G2III:, K0III:; C 11.7v at 143".

note (category: spectroscopic binaries):

0.9450d, K 97.9k/s, V0 +15.0k/s, asini 1.27.

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

position, motion, parallax:

position (J2000)	RA: 22h 2min 26.419sec	DEC: -16° 57' 52.39''	±0.27 arcsec	source: 16
proper motion (J2000)	RA: 0.0021 arcsec/a	DEC: 0.015 arcsec/a		source: 16
galactic coord. (B1950)	longitude: 38.55°	latitude: -49.74°

magnitude:

visual	7.2 (observed)	source: 94
photovisual	6.5	source: 2
photographic	6.6	source: 2

spectral information:

spectral class	A2		source: 96
Morgan-Keenan	K0III		source: 19

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	3.7 arcsec
magnitude difference between brightest and second brightest component	0.2
position angle	246 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	6.37	A2	29 Aqr, HR 8396, HD 209278, SAO 164830
B	7.2	A2

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
94	WDS Catalog or Blanco UBV Catalog
Reference from Value 19 or Reference from Blanco UBV Catalog Value 3
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 59min 42.543sec	DEC: -17° 12' 21.87''	±0.024 arcsec
position (J2000)	RA: 22h 2min 26.558sec	DEC: -16° 57' 51.4''
proper motion B1950 (FK4)	RA: 0.0009 arcsec/a	DEC: 0.004 arcsec/a	±0.004 arcsec/a in RA ±0.004 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.001 arcsec/a	DEC: 0.001 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	7.2 (accuracy: 1 decimal)
source of visual magnitude data	Based on Durchmusterung magnitudes and visual estimates

spectral information:

spectral class	A2
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: 30823
Durchmusterung	BD-17 6422A
Boss General Catalogue	30823
Henry Draper Catalogue	209278

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

position and proper motion:

position (J2000)	RA: 22h 2.4min	DEC: -16° 58'
proper motion (J2000)	RA: 0.03 arcsec/a	DEC: 0.015 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	1847	50	242°	3.7''	7.2	7.4	A2V+K0III	S 802
	1991		246°	-
AC	1913	1	291°	143''	6.37	11.7	-	S 802

discoverer information:

discoverer code	discoverer	reference
S 802	South, J.	-

notes:

note	29 Aqr. A is the Beta Lyrae-type system DX Aqr. Proper motion of B -025 -019.

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

position:

position (equinox 1950.0)

RA: 21h 59min 42.5sec

DEC: -17° 12' 22''

variability informations:

variability type	EA/KE:	close binary eclipsing system
magnitute at max. brightness	6.37
magnitute at min. brightness	6.78
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2442687.697 2. October 1975, 04:43:41 UT
period [d]	0.9450132
next maximum light [JD]	2452220.0451484 6. November 2001, 13:05:01 UT
duration of the eclipse	15 % of period

spectral information

spectral class

A2V

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	4/146
constellation	Aquarius
notes on existence	The star is equivalent to '0040147 DY'.
There are notes in published catalog.

variability type description

variability type	description
EA	Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other. Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion. EA Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes. EB Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V. EW W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later.
KE	Contact systems of early (O-A) spectral type, both components being close in size to their inner critical surfaces.