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	Asellus Secondus, i Boo, iot Boo, 21 Boo, HR 5350, HD 125161, SAO 29071, BD +52 1784, FK5: 528, WDS 14162+5122A
constellation	Bootes

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

note (category: star names):

Asellus Secondus.

position, motion, parallax:

position (J2000)	RA: 14h 16min 9.9sec	DEC: +51° 22' 2''
position (2000.73)	RA: 14h 16min 12sec	DEC: +51° 21' 50''
position (B1900)	RA: 14h 12min 37.4sec	DEC: +51° 49' 42''
proper motion (J2000)	RA: -0.15 arcsec/a	DEC: 0.092 arcsec/a
radial velocity	-19 km/s note: spectroscopic binaries
rotational velocity	137 km/s (uncertain) (variable)
trigonometric parallax	0.048 arcsec
galactic coordinates	longitude: 95.23°	latitude: 60.96°

magnitude

visual magnitude

4.75 (V on UBV Johnson system)

spectral / color information

spectral class	A9V
B-V-magnitude	0.2
U-B-magnitude	0.06
R-I-magnitude

variability information

variable star identification

Iot Boo

note (category: variability):

Delta Sct 4.73 - 4.78V, amp. 0.025B, about 40 min.

double/multiple star system information

number of components of multiple star system	3
separation	38.7 arcsec
mag difference (of double or brightest multiple)	3.5
component ID	AB

note (category: double and multiple data):

AB CPM? B is K0V.

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

position, motion, parallax:

position (J2000)	RA: 14h 16min 9.922sec	DEC: +51° 22' 2.17''	±0.06 arcsec	source: 15
position (2000.73)	RA: 14h 16min 12sec	DEC: +51° 21' 50''	JD: 2451810.88
proper motion (J2000)	RA: -0.016 arcsec/a	DEC: 0.092 arcsec/a		source: 25
radial velocity	-19 km/s			source: 25
trigonometric parallax	0.048 arcsec		±0.005 arcsec	source: 25
galactic coord. (B1950)	longitude: 95.22°	latitude: 60.96°

magnitude:

visual	4.75 (observed)	source: 25
photovisual	4.8	source: 2

spectral information:

spectral class	A5		source: 96
Morgan-Keenan	A9V		source: 25
B-magnitude	4.95 ±0.05	B-V-magnitude	0.2
U-magnitude	5.01 ±0.05	U-B-magnitude	0.06

variability information:

source of data: 27

variability type	150
var. amplitude	0.1

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	38.5 arcsec
magnitude difference between brightest and second brightest component	3.48
position angle	33 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	4.75	A5	Asellus Secondus, i Bootis, 21 Boo, HR 5350, HD 125161, SAO 29071
B	8.273	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
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
27	Catalog of Red Magnitudes (CRM)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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: 14h 14min 23.673sec	DEC: +51° 35' 49.93''	±0.004 arcsec
position (2000.73)	RA: 14h 16min 13sec	DEC: +51° 21' 45''	JD: 2451810.88
position (J2000)	RA: 14h 16min 9.925sec	DEC: +51° 22' 2.14''
proper motion B1950 (FK4)	RA: -0.0165 arcsec/a	DEC: 0.088 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.016 arcsec/a	DEC: 0.092 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.9 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	A5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 528
Durchmusterung	BD+52 1784
Boss General Catalogue	19269
Henry Draper Catalogue	125161

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

position and proper motion:

position (J2000)	RA: 14h 16.2min	DEC: +51° 22'
proper motion (J2000)	RA: -0.15 arcsec/a	DEC: 0.092 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	1820	41	33°	38.5''	4.75	8.23	A7IV K0V	STF 26
AC	1911	2	197°	85.9''	4.8	12.6	-	STF 26

discoverer information:

discoverer code	discoverer	reference
STF 26	Struve, F.G.W.	-

notes:

note	Iota Boo. A is a spectroscopic binary and a Delta Scuti-type variable, P = 0.027d. B is BD+52@1785. Proper motion of B -142 +079.

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

position:

position (equinox 1950.0)

RA: 14h 14min 23.7sec

DEC: +51° 35' 50''

variability informations:

variability type	DSCTC	pulsating variable star
magnitute at max. brightness	4.73
magnitute at min. brightness	4.78
photometric system	visual, photovisual or Johnson's V

references

to a study	J.Albert, JAAVSO 9,No.1,20,1980.
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	9/9009
constellation	Bootes
notes on existence	The star is equivalent to '67320'.

variability type description

variability type

description

DSCTC

Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables. DSCTC Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters.