u Ursae Majoris
catalogues and names
catalogues and names | u UMa, ups UMa, 29 UMa, HR 3888, HD 84999, SAO 27401, BD +59 1268, FK5: 368, WDS 09510+5902 |
constellation | Ursa Major |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 9h 50min 59.4sec | DEC: +59° 2' 19'' | ||
position (B1900) | RA: 9h 43min 52.9sec | DEC: +59° 30' 33'' | ||
proper motion (J2000) | RA: -0.293 arcsec/a | DEC: -0.151 arcsec/a | ||
radial velocity | 27 km/s note: suspected variable radial velocity |
|||
rotational velocity | 110 km/s (uncertain) (variable) | |||
trigonometric parallax | 0.041 arcsec | |||
galactic coordinates | longitude: 154.31° | latitude: 45.58° |
magnitude
visual magnitude | 3.8 (V on UBV Johnson system) |
spectral / color information
spectral class | F2IV |
B-V-magnitude | 0.29 |
U-B-magnitude | 0.1 |
R-I-magnitude | |
IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
variable star identification | Ups UMa |
note (category: variability): | Delta Sct 3.77 - 3.86V, 0.133d, amp. and form of light curve vary. |
double/multiple star system information
separation | 11.3 arcsec |
mag difference (of double or brightest multiple) | 8.6 |
note (category: double and multiple data): | CPM. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 9h 50min 59.366sec | DEC: +59° 2' 19.45'' | ±0.06 arcsec | source: 15 |
proper motion (J2000) | RA: -0.038 arcsec/a | DEC: -0.151 arcsec/a | source: 25 | |
radial velocity | 27 km/s | source: 25 | ||
trigonometric parallax | 0.041 arcsec | ±0.004 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 154.31° | latitude: 45.58° |
magnitude:
visual | 3.7 (observed) | source: 31 |
photovisual | 3.9 | source: 2 |
spectral information:
spectral class | F0 | source: 96 | |
Morgan-Keenan | F2IV | source: 25 | |
B-magnitude | 4.09 ±0.05 | B-V-magnitude | 0.29 |
U-magnitude | 4.19 ±0.05 | U-B-magnitude | 0.1 |
variability information:
variability type | 150 |
var. amplitude | 0.18 |
var. period | 0.13 |
var. epoch | 2441354 6. February 1972, 12:00:00 UT |
next max light | 2452219.27 5. November 2001, 18:28:48 UT |
double/multiple star system information:
separation between brightest and second brightest component | 11.3 arcsec |
magnitude difference between brightest and second brightest component | 7.7 |
position angle | 295 ° |
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 | |
30 | GCVS, 4th edition |
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
31 | CRM' (non-GCVS variable data) |
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: 9h 47min 27.102sec | DEC: +59° 16' 30.31'' | ±0.003 arcsec |
position (J2000) | RA: 9h 50min 59.376sec | DEC: +59° 2' 19.49'' | |
proper motion B1950 (FK4) | RA: -0.0382 arcsec/a | DEC: -0.156 arcsec/a | ±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: -0.0379 arcsec/a | DEC: -0.151 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 3.9 (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: 368 |
Durchmusterung | BD+59 1268 |
Boss General Catalogue | 13540 |
Henry Draper Catalogue | 84999 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
position (J2000) | RA: 9h 51min | DEC: +59° 2' |
proper motion (J2000) | RA: -0.293 arcsec/a | DEC: -0.151 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 |
- | 1855 | 8 | 295° | 11.3'' | 3.8 | 11.5 | A9IV | STT 521 |
discoverer information:
discoverer code | discoverer | reference |
STT 521 | Struve, O. | - |
notes:
note | Upsilon UMa. A is a Delta Scuti-type variable. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 9h 47min 27.1sec | DEC: +59° 16' 30'' |
variability informations:
variability type | DSCT | pulsating variable star |
magnitute at max. brightness | 3.68 | |
magnitute at min. brightness | 3.86 | |
photometric system | visual, photovisual or Johnson's V | |
epoch for maximum light [JD] | 2441353.54 6. February 1972, 00:57:36 UT |
|
period [d] | 0.1327 | |
next maximum light [JD] | 2452219.1487 5. November 2001, 15:34:08 UT |
|
rising time | 64 % of period |
spectral information
spectral class | F2IV |
references
to a study | Vol. III GCVS |
to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
ID in the GCVS catalogue | 83/9020 |
constellation | Ursa Major |
notes on existence | The star is equivalent to '0840001 R'. |
There are notes in published catalog. |
variability type description
variability type | description |
DSCT | 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. |