Host galaxies of novae discovered in 2018
The following is a list of all novae that are known to have occurred in 2019. A nova is an energetic astronomical event caused by a white dwarf accreting matter from a star it is orbiting (typically a red giant, whose outer layers are more weakly attached than smaller, denser stars) Alternatively, novae can be caused by a pair of stars merging with each other, however such events are vastly less common than novae caused by white dwarfs.
In 2019, at least sixteen Milky Way novae were discovered, eight of which were dwarf nova eruptions, one of the variable system V386 Serpentis, one from the known nova-like system 2E 1516.6-6827, and four from previously unidentified white dwarf binaries. One of these binaries, TCP J18200437-1033071, may have possibly been involved in another outburst in 1951. The recurrent nova V3890 Sgr, which had been seen to erupt in 1962 and 1990, also erupted again in 2019.
List of novae in 2019 In the Milky Way Nova nameDiscovery dateConstellationRight ascensionDeclinationPeak Brightness (v)Distance(light years)Absolutemagnitude (v)Nova typeOrigin systemidentified?Companion starspectral typeIn most cases, the spectral type is estimated based on the absolute magnitudeV386 Serpentis 2019/01/18 Serpens 10.4 Dwarf nova Yes White dwarfTCP J06373299-0935420 2019/02/21 Monoceros 10.4 Dwarf nova Yes White dwarfTCP J05390410+4748030 2019/03/14 Auriga 11.3 Dwarf nova Yes White dwarfTCP J05515391+6504346 2019/04/01 Camelopardalis 13.2 Dwarf nova Yes White dwarfTCP J18325790-1642211 2019/04/02 Sagittarius 12.5 Classical Yes K5IIITCP J18200437-1033071 2019/04/08 Serpens 13.3 Dwarf nova Yes White dwarfPNV J15212688-6838261 2019/05/11 Triangulum Australe 13.6 Dwarf nova Yes K?VAT 2019fez 2019/05/13 Scorpius 13.1 ? ? Classical No ?TCP J10240289+4808512 2019/05/25 Ursa Major 11.8 Dwarf nova Yes White dwarf V2860 Ori 2019/08/07 Orion 9.4 ? ? Classical ? ? V569 Vul 2019/08/18 Vulpecula 13.3 ? ? Classical ? ? V3890 Sgr 2019/08/27 Sagittarius 7.1 ? ? Recurrent Yes Red Giant Gaia19edn 2019/09/14 Ophiuchus 12.3 ? ? Classical ? ? V1707 Sco 2019/09/15 Scorpius 11.7 ? ? Classical ? ? V2891 Cyg 2019/09/17 Cygnus 14.3 ? ? Classical Yes ? V659 Sct 2019/10/29 Scutum 8.36 ? ? Classical ? ?
In the Andromeda Galaxy Novae are also frequently spotted in the Andromeda Galaxy, and are even slightly more commonly found than in the Milky Way, as there is less intervening dust to prevent their detection. Furthermore, Andromeda is circumpolar for observers north of latitude +48-50, roughly the latitude of the Canadian-American border, allowing observers north of that to search for transients all year.
In 2019, 11 novae have been seen in the Andromeda galaxy. Nova nameDiscovery dateRight ascensionDeclinationPeakbrightness (v)Absolutemagnitude (v)PNV J00420290+41071422019/01/2018.2 -6.3PNV J00424503+41142482019/01/2118.0 -6.5PNV J00430008+41183402019/01/2319.5 -5.0PNV J00422916+41140132019/01/2719.6 -4.9PNV J00435457+41173302019/01/2817.5 -7.0PNV J00425100+41210382019/02/0318.8 -5.7PNV J00421999+41132252019/03/1318.8 -5.7PNV J00423396+41135772019/04/1617.3 -7.2PNV J00424174+41162632019/04/2616.6 -7.9PNV J00422198+41235842019/05/2416.7 -7.8PNV J00432058+41254262019/05/2817.4 -7.1
In other galaxies Any galaxy within 20 million light-years of the Sun could theoretically have nova events bright enough to be detected from Earth, although in practice most are only detected in galaxies within 10-15 million light-years of the Milky Way, such as the Triangulum Galaxy, Messier 81, Messier 82, Messier 83, and Messier 94.
In 2019, two novae were observed in Messier 81, and another in the Triangulum Galaxy. A luminous red nova was observed in the Whirlpool Galaxy (Messier 51a), probably caused by a merger of two stars.
Nova nameDiscovery dateHost galaxyRight ascensionDeclinationPeakbrightness (v)Distance(million light-years)Absolutemagnitude (v)TypeAT 2019gc2019/01/06Triangulum Galaxy17.02.65 -7.5 ClassicalAT 2019abn2019/01/22Whirlpool Galaxy16.923 -12.3 Luminous Red NovaPNV J09555100+69023232019/04/14Messier 8119.811.5 -7.9 ClassicalPNV J09554664+69024732019/06/09Messier 8119.111.5 -8.6 Classical
See also List of novae in 2018 Nova Dwarf nova Luminous red nova Guest star (astronomy) Supernova
Notes
References
External links List of all galactic novae