About: ER Ursae Majoris

An Entity of Type: star, from Named Graph: http://dbpedia.org, within Data Space: dbpedia.org:8891

ER Ursae Majoris is a variable star in the northern circumpolar constellation of Ursa Major, abbreviated ER UMa. It is a prototype system for a subclass of SU Ursae Majoris dwarf novae. The system ranges in brightness from a peak apparent visual magnitude of 12.4 down to 15.2, which is too faint to be visible to the naked eye. The distance to this system, based on parallax measurements, is approximately 1,163 light years.

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  • ER Ursae Majoris is a variable star in the northern circumpolar constellation of Ursa Major, abbreviated ER UMa. It is a prototype system for a subclass of SU Ursae Majoris dwarf novae. The system ranges in brightness from a peak apparent visual magnitude of 12.4 down to 15.2, which is too faint to be visible to the naked eye. The distance to this system, based on parallax measurements, is approximately 1,163 light years. This system was identified as an ultraviolet excess object as part of the Palomar-Green (PG) survey by and associate in 1986. It was given the catalog identifier PG 0943+521, and was confirmed to be cataclysmic variable. In 1992, it was determined this is a dwarf nova that ranges in brightness from magnitude 12.3 down to 15.2. in 1993 found a candidate orbital period of 0.1997 days based on radial velocity variation, but with some uncertainty. In 1995, T. Kato and confirmed this is a SU Ursae Majoris-type dwarf nova, and noted the unusual nature of this system, finding it has a long superoutburst lasting about 20 days and the supercycle (the time between superoutbursts) is very short at around 43 days. Large amplitude superhumps were found to occur near the start of a superoutburst, with a brightness increase of around 0.35 magnitude. The properties of the system suggest a high mass transfer rate and the white dwarf component is hotter than in other typical dwarf novae. During periods of quiescence, the accretion rate is 7.3×10−11 M☉·yr−1. (en)
  • ER Большой Медведицы (лат. ER Ursae Majoris) — карликовая новая, двойная катаклизмическая переменная звезда типа U Близнецов (UG:) в созвездии Большой Медведицы на расстоянии приблизительно 1219 световых лет (около 374 парсеков) от Солнца. Видимая звёздная величина звезды — от +15,2m до +12,4m. (ru)
  • ER Ursae Majoris är en dvärgnova i stjärnbilden Stora björnen. Den är en SU Ursae Majoris-variabel (UGSU), som karaktäriseras av att ha två typer av utbrott. ER UMa är prototypstjärna för en undergrupp, ER Ursae Majoris-variabler (UGER) som tillbringar så mycket som en tredjedel av sin tid i ”superutbrott” med en period av 20-90 dygn. Utöver superutbrotten har de ”normala” utbrott i snabb följd. Amplituden i utbrotten är mindre än hos andra dvärgnovor, vanligtvis 3 magnituder. Stjärnan varierar mellan visuell magnitud +12,4 och 15,2 under sina superutbrott. Perioden för dess ”normala” utbrott är 0,06366 dygn eller 91,67 minuter. (sv)
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  • White dwarf (en)
  • Donor star (en)
dbp:constell
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  • 0 (xsd:integer)
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  • J2000 (en)
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  • 18 (xsd:integer)
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  • 48 (xsd:integer)
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  • 0.100000 (xsd:double)
  • 1 (xsd:integer)
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  • 0.020500 (xsd:double)
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  • 2.803900 (xsd:double)
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  • 0 (xsd:integer)
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  • −6.209 (en)
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  • 33.659000 (xsd:double)
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  • ER Большой Медведицы (лат. ER Ursae Majoris) — карликовая новая, двойная катаклизмическая переменная звезда типа U Близнецов (UG:) в созвездии Большой Медведицы на расстоянии приблизительно 1219 световых лет (около 374 парсеков) от Солнца. Видимая звёздная величина звезды — от +15,2m до +12,4m. (ru)
  • ER Ursae Majoris is a variable star in the northern circumpolar constellation of Ursa Major, abbreviated ER UMa. It is a prototype system for a subclass of SU Ursae Majoris dwarf novae. The system ranges in brightness from a peak apparent visual magnitude of 12.4 down to 15.2, which is too faint to be visible to the naked eye. The distance to this system, based on parallax measurements, is approximately 1,163 light years. (en)
  • ER Ursae Majoris är en dvärgnova i stjärnbilden Stora björnen. Den är en SU Ursae Majoris-variabel (UGSU), som karaktäriseras av att ha två typer av utbrott. ER UMa är prototypstjärna för en undergrupp, ER Ursae Majoris-variabler (UGER) som tillbringar så mycket som en tredjedel av sin tid i ”superutbrott” med en period av 20-90 dygn. Utöver superutbrotten har de ”normala” utbrott i snabb följd. Amplituden i utbrotten är mindre än hos andra dvärgnovor, vanligtvis 3 magnituder. (sv)
rdfs:label
  • ER Ursae Majoris (en)
  • ER Большой Медведицы (ru)
  • ER Ursae Majoris (sv)
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