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- Willman_1 abstract "Willman 1 is an ultra low-luminosity dwarf galaxy or a star cluster. Willman 1 was discovered in 2004. It is named after Beth Willman of Haverford College, the lead author of a study based on the Sloan Digital Sky Survey data. The object is a satellite of the Milky Way, at ~120,000 light-years away. Willman 1 has an elliptical shape with the half-light radius of about 25 pc. Its heliocentric velocity is approximately −13 km/s.As of 2007, it was declared the least massive galaxy known, opening up a new category of ultra-low-mass galaxies, lower than the then-theoretical minimum of 10 million solar masses thought to be needed to form a galaxy.As of 2011, it is the second dimmest likely galaxy known, after Segue 1, and is less than one ten millionth the Milky Way's luminosity. It has an absolute magnitude of −2.7 ± 0.7. Observations indicate its mass is about 0.4 million solar masses, which means that Willman's 1 mass to light ratio is around 800. A high mass to light ratio implies that Willman 1 is dominated by dark matter. It is difficult, however, to estimate the mass of such faint objects because any mass estimate is based on an implicit assumption that an object is gravitationally bound, which may not be true if the object is in a process of disruption.The stellar population of Willman 1 consists mainly of old stars formed more than 10 billion years ago. The metallicity of these stars is also very low at [Fe/H] ≈ −2.1, which means that they contain 110 times less heavy elements than the Sun.".
- Willman_1 wikiPageExternalLink nph-objsearch?objname=SDSS+J1049%2B5103.
- Willman_1 wikiPageID "1384685".
- Willman_1 wikiPageRevisionID "601375566".
- Willman_1 appmagV "15.2".
- Willman_1 constellationName Ursa_Major.
- Willman_1 distLy "120".
- Willman_1 epoch Epoch_(astronomy).
- Willman_1 hasPhotoCollection Willman_1.
- Willman_1 name "Willman 1".
- Willman_1 names "SDSS J1049+5103".
- Willman_1 sizeV "4.6".
- Willman_1 title List_of_galaxies.
- Willman_1 type "extreme dSph or".
- Willman_1 type "unusual star cluster".
- Willman_1 years "2007".
- Willman_1 years "500000".
- Willman_1 subject Category:Dwarf_galaxies.
- Willman_1 subject Category:Dwarf_spheroidal_galaxies.
- Willman_1 subject Category:Globular_clusters.
- Willman_1 subject Category:Local_Group.
- Willman_1 subject Category:Milky_Way_Subgroup.
- Willman_1 subject Category:Objects_within_1_Mly_of_Earth.
- Willman_1 type CelestialBody.
- Willman_1 type Galaxy.
- Willman_1 type PhysicalBody.
- Willman_1 comment "Willman 1 is an ultra low-luminosity dwarf galaxy or a star cluster. Willman 1 was discovered in 2004. It is named after Beth Willman of Haverford College, the lead author of a study based on the Sloan Digital Sky Survey data. The object is a satellite of the Milky Way, at ~120,000 light-years away. Willman 1 has an elliptical shape with the half-light radius of about 25 pc.".
- Willman_1 label "Willman 1".
- Willman_1 label "Willman 1".
- Willman_1 label "Willman 1".
- Willman_1 label "Willman 1".
- Willman_1 label "Willman 1".
- Willman_1 label "Willman 1".
- Willman_1 label "Виллман 1".
- Willman_1 label "威爾曼1".
- Willman_1 sameAs Willman_1.
- Willman_1 sameAs Willman_1.
- Willman_1 sameAs Willman_1.
- Willman_1 sameAs Willman_1.
- Willman_1 sameAs Willman_1.
- Willman_1 sameAs m.04y9r8.
- Willman_1 sameAs Q32882.
- Willman_1 sameAs Q32882.
- Willman_1 wasDerivedFrom Willman_1?oldid=601375566.
- Willman_1 isPrimaryTopicOf Willman_1.
- Willman_1 name "SDSS J1049+5103".
- Willman_1 name "Willman 1".