Polaris | has declination +89 15 51 | ![2001-09-27 09:31:43.0 2001-09-27 09:31:43.0](facet.gif) |
has right ascension 2 31 50.5 | ![2001-09-27 09:31:43.0 2001-09-27 09:31:43.0](facet.gif) |
has period 3.97 days | ![has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:43.0 has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:43.0](facet.gif) |
has primary F8 Ib | ![2001-09-27 09:31:43.0 2001-09-27 09:31:43.0](facet.gif) |
has spectral type F7:Ib-IIv | ![2001-09-27 09:31:43.0 2001-09-27 09:31:43.0](facet.gif) |
has V magnitude 2.02 | ![2001-09-27 09:31:43.0 2001-09-27 09:31:43.0](facet.gif) |
is a part of Ursa Minor | ![has URL: http://www.seds.org/Maps/Const/Data/ursaminor_tab.html, 2001-09-27 09:31:42.0 has URL: http://www.seds.org/Maps/Const/Data/ursaminor_tab.html, 2001-09-27 09:31:42.0](facet.gif) |
has distance 330 light-years | ![has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:43.0 has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:43.0](facet.gif) |
has synonym HR 424 | ![2001-09-27 09:31:42.0 2001-09-27 09:31:42.0](facet.gif) |
has synonym Pole star | ![has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:42.0 has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:42.0](facet.gif) |
has synonym North Star | ![has source: Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books, 2001-09-27 09:31:43.0 has source: Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books, 2001-09-27 09:31:43.0](facet.gif) |
has synonym alpha UMi | ![has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:43.0 has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:43.0](facet.gif) |
has B-V magnitude 0.60 | ![2001-09-27 09:31:43.0 2001-09-27 09:31:43.0](facet.gif) |
has use The star that lies near the direction in the sky toward which the North Pole of the Earth points. | ![has source: Ferris, T. 1988 Coming of Age in the Milky Way, Morrow, 2001-09-27 09:31:42.0 has source: Ferris, T. 1988 Coming of Age in the Milky Way, Morrow, 2001-09-27 09:31:42.0](facet.gif) |
has definition A supergiant F8 Ib, F3 V visual binary, with an orbital period of thousands of years. The primary (a Cepheid with a pulsation period of 3.97 days) is itself a single-lined spectroscopic double with a period of 29.6 years. There are at least two more faint (12th mag) components of the system. | ![has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:42.0 has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:42.0](facet.gif) |
is an instance of Population I Cepheid | ![has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:42.0 has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:31:42.0](facet.gif) |
is an instance of F star | ![2001-09-27 09:31:42.0 2001-09-27 09:31:42.0](facet.gif) |
is an instance of supergiant | ![2001-09-27 09:31:42.0 2001-09-27 09:31:42.0](facet.gif) |
is an instance of naked eye star | ![2001-09-27 09:31:42.0 2001-09-27 09:31:42.0](facet.gif) |
is an instance of binary star | ![2001-09-27 09:31:42.0 2001-09-27 09:31:42.0](facet.gif) |
F star | has color yellow-white | ![2001-09-27 09:30:46.0 2001-09-27 09:30:46.0](facet.gif) |
has surface temperature 6000 to 7500 K | ![2001-09-27 09:30:46.0 2001-09-27 09:30:46.0](facet.gif) |
naked eye star | has been observed for many centuries | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
is usually part of asterism | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
is a part of celestial sphere | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
is a part of Milky Way | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has apparent magnitude brighter than 5 | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
binary star | has number of stars 2 | ![2001-09-27 09:30:54.0 2001-09-27 09:30:54.0](facet.gif) |
has orbital period | ![2001-09-27 09:30:31.0 2001-09-27 09:30:31.0](facet.gif) |
Population I Cepheid | has absolute magnitude <Mv> = -0.5 to -6 | ![2001-09-27 09:30:38.0 2001-09-27 09:30:38.0](facet.gif) |
supergiant | has luminosity class I | ![2001-09-27 09:30:50.0 2001-09-27 09:30:50.0](facet.gif) |
star | has star surface temperature | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has B magnitude | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has U magnitude | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has position on celestial sphere from the point of view of Earth | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has parallax from the point of view of Earth's orbit | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has proper motion | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has radiation at surface which is diffused out from the hotter core | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has energy source gravitational contraction and or fusion | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has energy production which takes place primarily within the core | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has surface density which depends on luminosity class | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has age | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has catalog star catalog | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has material hydrogen, helium | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has velocity determined from proper motion and radial velocity | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has mass greater than 0.08 the sun's mass | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
star system | has abundance half the stars in the solar neighborhood are members of star systems | ![2001-09-27 09:30:54.0 2001-09-27 09:30:54.0](facet.gif) |
Population I star | has author Baade (1944) | ![2001-09-27 09:30:27.0 2001-09-27 09:30:27.0](facet.gif) |
is a part of disk | ![2001-09-27 09:30:26.0 2001-09-27 09:30:26.0](facet.gif) |
Cepheid | has prototype delta Cephei | ![2001-09-27 09:30:38.0 2001-09-27 09:30:38.0](facet.gif) |
celestial body | has spectra | ![2001-09-27 09:30:09.0 2001-09-27 09:30:09.0](facet.gif) |
physical object | has location or center of gravity | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has angular momentum | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has momentum | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has temperature | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has volume | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has extent | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
variable | has name designated with - R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name
- RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted
- AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted
- V 335, V 336, etc., when the double letter designations are exhausted
| ![2001-09-27 09:30:34.0 2001-09-27 09:30:34.0](facet.gif) |
has observational problem some difficulty in distinguishing between various kinds | ![2001-09-27 09:30:34.0 2001-09-27 09:30:34.0](facet.gif) |
has observable variation time scale within a period of decades | ![has URL: http://www.aavso.org, 2001-09-27 09:30:34.0 has URL: http://www.aavso.org, 2001-09-27 09:30:34.0](facet.gif) |
has light curve | ![2001-09-27 09:30:34.0 2001-09-27 09:30:34.0](facet.gif) |
has optical brightness variation 0.2 magnitudes or greater | ![2001-09-27 09:30:34.0 2001-09-27 09:30:34.0](facet.gif) |
has amplitude | ![2001-09-27 09:30:34.0 2001-09-27 09:30:34.0](facet.gif) |