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Details for Revision 2
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  alf UMi  
000-BBF-045 (809 observations)  
Ursa Minor Sequence
02 31 49.10 +89 15 51.0  (37.95458 +89.26417) Search nearby
B1950.0 01 48 56.34 +89 01 43.3
Galactic coord. 123.281 +26.461
Other names

(Internal only)
1 UMi 3XMM J023145.5+891548 AAVSO 0122+88
ADS 1477 A BD+88 8 CCDM J02319+8915A
CXO J023149.5+891550 CXOGSG J023150.1+891550 HD 8890
HIP 11767 HR 424 IRAS 01490+8901
Polaris RAFGL 273 SAO 308
TYC 4628-237-1 WDS J02318+8916Aa  
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Variability type
Spectral type F7Ib-F8Ib
Mag. range
1.86 - 2.13 V
Discoverer --
09 Feb 1945 (HJD 2431495.813) Ephemeris
Outburst --
Period 3.9696 d
Rise/eclipse dur. 50%  (48 h)
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1 Otero, Sebastian Alberto Amplitude decrease during the 20th century. Currently, amplitude varies but always below 0.05 mag. Period is increasing.
2 GCVS Team VB A (B 8.20m, F3V, 18.3", 218deg); SB1 (Porb = 10969d, E = 0.655 [K.W.Kamper, N.R.Evans, R.W. Lyons, JRAS Can 78, N5, 173, 1984.]). P var. There is a non-linear term in the elements: +1.9877d*10**(-7)*E**2. The amplitude of light and radial velocity variation decreased in 1982. A(V) = 0.04m (1984).
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1 A.Arellano Ferro, ApJ 274, 755, 1983. 1983ApJ...274..755A
2 Hertzsprung, E., 1911, Nachweis der Veränderlichkeit von alpha Ursae
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Supporting Documents
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1 Alpha Ursae Minoris light curve Otero, Sebastian Alberto 2007-12-04 14:56 UTC Light curve using Hipparcos data transformed to V. showing the current small amplitude of the star.
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Revision History
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4 Schmeer, Patrick 2018-07-05 06:46 UTC Discoverer added from 1911AN....189...89H.
3 Otero, Sebastian Alberto 2007-12-04 14:56 UTC HIP position. HIP photometry transformed to V used for the range.
2 Koppelman, Michael 2007-12-04 02:36 UTC The SIMBAD links fills in Polaris for this star but you can't search for it by that name. I'm hoping this fixes that.
1 Admin, VSX 2005-12-17 20:33 UTC Initial database population.