List of novae in 2018

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Host galaxies of novae discovered in 2018
Milky Way: 15 (30.6%)Andromeda Galaxy: 23 (46.9%)Messier 81: 8 (16.3%)Triangulum Galaxy: 1 (2.0%)Messier 83: 1 (2.0%)NGC 45: 1 (2.0%)Circle frame.svg
  •   Milky Way: 15 (30.6%)
  •   Andromeda Galaxy: 23 (46.9%)
  •   Messier 81: 8 (16.3%)
  •   Triangulum Galaxy: 1 (2.0%)
  •   Messier 83: 1 (2.0%)
  •   NGC 45: 1 (2.0%)

The following is a list of all novae that are known to have occurred in 2018. 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 rarely be caused by a pair of stars merging with each other, however such events are vastly less common than novae caused by white dwarves.

In 2018, 15 novae were discovered in the Milky Way, 14 being classical novae, and 1 being a dwarf nova of a previously known variable star, V392 Persei, which was discovered in 1972. An additional 23 novae were discovered in the Andromeda Galaxy, 8 in Messier 81, 1 in the Triangulum Galaxy, and 1 in Messier 83. A single luminous red nova was observed in NGC 45.

List of novae in 2018 is located in Sky
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
List of novae in 2018
The sky locations of the 15 known galactic novae in 2018. Red dots are classical novae, orange dots are dwarf novae, yellow dots are luminous red novae, and blue dots are recurring novae.

List of novae in 2018[edit]

In the Milky Way[edit]

Nova name Discovery date Constellation Right ascension Declination Peak
brightness (v)[1]
Distance
(light-years)[2]
Absolute
magnitude (v)
Nova type Origin system
identified?
Companion star
spectral type[note 1]
Nova Muscae 2018[3] 2018/01/14 Musca  11h 26m 15.03s −65° 31′ 24.3″ 6.5 11500+6900
−3100
−6.2+0.7
−1.0
Classical Yes F9V/G0V
Nova Scorpii 2018[4] 2018/01/17 Scorpius  17h 18m 06.41s −32° 04′ 27.2″ 10.2 ? ? Classical Yes ?
Nova Circini 2018[5] 2018/01/19 Circinus  13h 53m 27.61s −67° 25′ 00.9″ 5.9 9400+3700
−2100
−6.4+0.6
−0.7
Classical Yes G1V
Nova Scorpii 2018 #2[6] 2018/02/06 Scorpius  16h 48m 49.64s −44° 57′ 03.0″ 10.1 ? ? Classical Yes ?
Nova Ophiuchi 2018[7] 2018/02/12 Ophiuchus  17h 24m 39.96s −24° 21′ 47.4″ 12.5 45000+99999
−28000
−3.2+2.1
−1.7
Classical Yes M0II/III
ASASSN-18ds[8] 2018/02/24 Scorpius  17h 03m 47.51s −38° 16′ 57.1″ 12.3 3400+99999
−1800
2.2+1.6
−7.3
Classical Maybe ?
Nova Ophiuchi 2018 #2[9] 2018/03/10 Ophiuchus  17h 14m 02.55s −28° 49′ 23.9″ 9.4 ? ? Classical Yes ?
Nova Carinae 2018[10] 2018/03/20 Carina  10h 36m 15.43s −59° 35′ 53.7″ 5.9 22000+99999
−17000
−8.2+3.7
−3.3
Classical Yes ?
Nova Canis Majoris 2018[11] 2018/03/24 Canis Major  07h 13m 45.90s −21° 12′ 33.0″ 12.0 ? ? Classical Maybe ?
Nova Sagittarii 2018[12] 2018/04/08 Sagittarius  18h 04m 09.45s −18° 03′ 55.9″ 10.8 ? ? Classical Yes ?
Nova Lupi 2018[13] 2018/06/03 Lupus  15h 38m 43.86s −47° 44′ 42.0″ 9.0 2910+1700
−780
−0.8+0.7
−1.0
Classical Maybe K7V?
Nova Scuti 2018[14] 2018/06/29 Scutum  18h 29m 22.96s −14° 30′ 44.0″ 10.3 ? ? Classical Yes ?
Nova Ophiuchi 2018 #3[15] 2018/08/08 Ophiuchus  17h 42m 24.10s −20° 53′ 08.8″ 9.0 ? ? Classical No ?
Nova Normae 2018[16] 2018/10/13 Norma  16h 14m 32.92s −53° 30′ 14.7″ 10.2 ? ? Classical Yes ?

In the Andromeda Galaxy[edit]

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 2018, 23 novae were seen in the Andromeda galaxy.

Nova name Discovery date Right ascension Declination Peak
brightness (v)[1]
Absolute
magnitude (v)
PNV J00444425+4142449 2018/01/10  00h 44m 44.25s 41° 42′ 44.9″ 18.4 -6.1
PNV J00431577+4118393 2018/01/12  00h 43m 15.77s 41° 18′ 39.3″ 17.8 -6.7
PNV J00423439+4044255 2018/02/07  00h 42m 34.39s 40° 44′ 25.5″ 16.7 -7.8
PNV J00415059+4125499 2018/02/22  00h 41m 50.59s 41° 25′ 49.9″ 17.9 -6.6
PNV J00424041+4112522 2018/03/21  00h 42m 40.41s 41° 12′ 52.2″ 18.1 -6.4
PNV J00425509+4119009 2018/04/03  00h 42m 55.09s 41° 19′ 00.9″ 17.6 -6.9
PNV J00421895+4113524 2018/04/19  00h 42m 18.95s 41° 13′ 52.4″ 16.9 -7.6
PNV J00415353+4114121 2018/04/29  00h 41m 53.53s 41° 14′ 12.1″ 17.5 -7.0
PNV J00434212+4122349 2018/05/19  00h 43m 42.12s 41° 22′ 34.9″ 17.0 -7.5
PNV J00424144+4117377 2018/06/26  00h 42m 41.44s 41° 17′ 37.7″ 17.1 -7.4
PNV J00414889+4109148 2018/07/01  00h 41m 48.89s 41° 09′ 14.8″ 17.4 -7.1
PNV J00420765+4119438 2018/07/12  00h 42m 07.65s 41° 19′ 43.8″ 17.3 -7.2
PNV J00425261+4118409 2018/07/15  00h 42m 52.61s 41° 18′ 40.9″ 18.6 -5.9
PNV J00425074+4115461 2018/07/31  00h 42m 50.74s 41° 15′ 46.1″ 19.1 -5.4
PNV J00424214+4114457 2018/08/02  00h 42m 42.14s 41° 14′ 45.7″ 17.5 -7.0
PNV J00392190+4015488 2018/08/13  00h 39m 21.90s 40° 15′ 48.8″ 19.0 -5.5
PNV J00451587+4210269 2018/08/21  00h 45m 15.87s 42° 10′ 26.9″ 17.9 -6.6
PNV J00424990+4123348 2018/10/11  00h 42m 49.90s 41° 23′ 34.8″ 17.9 -6.6
PNV J00424012+4117273 2018/10/13  00h 42m 40.12s 41° 17′ 27.3″ 17.5 -7.0
TCP J00420310+4102331 2018/10/15  00h 42m 03.10s 41° 02′ 33.1″ 18.0 -6.5
PNV J00424065+4111080 2018/12/03  00h 42m 40.65s 41° 11′ 08.0″ 18.7 -5.8
PNV J00424241+4119411 2018/12/17  00h 42m 42.41s 41° 19′ 41.1″ 18.2 -6.3
PNV J00432462+4120222 2018/12/22  00h 43m 24.62s 41° 20′ 22.2″ 18.0 -6.5
PNV J00424380+4117208 2018/12/23  00h 42m 43.80s 41° 17′ 20.8″ 17.5 -7.0

In other galaxies[edit]

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 2018, of the ten novae observed in other galaxies than the Milky Way or the Andromeda Galaxy, eight were in Messier 81, with the remaining two from the Triangulum Galaxy and Messier 83. A luminous red nova, probably caused by the merger of two stars, occurred in NGC 45.

Nova name Discovery date Host galaxy Right ascension Declination Peak
brightness (v)[1]
Distance
(million light-years)
Absolute
magnitude (v)
Type
PNV J13370978-2956576 2018/01/28 Messier 83  13h 37m 09.78s −29° 56′ 57.6″ 20.7 15.2 -7.6 Classical
PNV J09555926+6903517 2018/01/30 Messier 81  09h 55m 59.26s 69° 03′ 51.7″ 20.3 11.5 -7.4 Classical
PNV J09545236+6904085 2018/02/19 Messier 81  09h 54m 52.36s 69° 04′ 08.5″ 20.0 11.5 -7.7 Classical
PNV J09553607+6902141 2018/03/06 Messier 81  09h 55m 36.07s 69° 02′ 14.1″ 20.8 11.5 -6.9 Classical
PNV J09551340+6900478 2018/03/20 Messier 81  09h 55m 13.40s 69° 00′ 47.8″ 21.2 11.5 -6.5 Classical
PNV J09553194+6909147 2018/04/02 Messier 81  09h 55m 31.94s 69° 09′ 14.7″ 20.4 11.5 -7.3 Classical
PNV J09555269+6858409 2018/04/09 Messier 81  09h 55m 52.69s 68° 58′ 40.9″ 20.6 11.5 -7.1 Classical
AT 2018bwo 2018/05/22 NGC 45  00h 14m 01.72s −23° 11′ 35.8″ 16.4 32.6 -13.6 Luminous Red Nova
PNV J09560988+6859108 2018/10/12 Messier 81  09h 56m 09.88s 68° 59′ 10.8″ 20.1 11.5 -7.6 Classical
PNV J01334673+3032181 2018/10/13 Triangulum Galaxy  01h 33m 46.73s 30° 32′ 18.1″ 18.1 2.65 -6.4 Classical
PNV J09555246+6902009 2018/11/06 Messier 81  09h 55m 52.46s 69° 02′ 00.9″ 20.0 11.5 -7.7 Classical

See also[edit]

Notes[edit]

  1. ^ In most cases, the spectral type is estimated based on the absolute magnitude

References[edit]

  1. ^ a b c Mukai, Koji. "Recent Novae". asd.gsfc.nasa.gov. Retrieved 25 January 2019.
  2. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  3. ^ "CBET 4473: 20180117 : NOVA MUSCAE 2018". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  4. ^ "CBET 4481: 20180130 : NOVA SCORPII 2018 = PNV J17180658-3204279". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  5. ^ "CBET 4482: 20180130 : NOVA CIRCINI 2018 = PNV J13532700-6725110". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  6. ^ "CBET 4488: 20180212 : NOVA SCORPII 2018 No. 2 = PNV J16484962-4457032". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  7. ^ "CBET 4489: 20180225 : NOVA IN OPHIUCHUS = PNV J17244011-2421463". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  8. ^ Stanek, K. Z. "ATel #11348: ASAS-SN Discovery of a Possible Galactic Nova ASASSN-18ds". ATel. Retrieved 25 January 2019.
  9. ^ "CBET 4492: 20180312 : NEW NOVA IN OPHIUCHUS = TCP J17140253-2849233 = PNV J17140261-2849237". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  10. ^ "CBET 4498: 20180322 : NOVA CARINAE 2018". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  11. ^ "CBET 4499: 20180325 : NOVA CANIS MAJORIS 2018 = TCP J07134590-2112330". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  12. ^ "CBET 4507: 20180412 : NOVA IN SAGITTARIUS = PNV J18040967-1803581". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  13. ^ "CBET 4520: 20180605 : NOVA LUPI 2018 = PNV J15384000-4744500". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  14. ^ "CBET 4530: 20180703 : NOVA SCUTI 2018 = TCP J18292290-1430460". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  15. ^ "CBET 4540: 20180813 : NEW NOVA IN OPHIUCHUS = PNV J17422408-2053088". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
  16. ^ "CBET 4568: 20181026 : NOVA NORMAE 2018 = PNV J16143400-5330050". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.

External links[edit]