List of novae in 2018
| Host galaxies of novae discovered in 2018 |
|
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 dwarfs.
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.
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] |
|---|---|---|---|---|---|---|---|---|---|---|
| V357 Muscae[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 |
| V1661 Scorpii[4] | 2018/01/17 | Scorpius | 17h 18m 06.41s | −32° 04′ 27.2″ | 10.2 | ? | ? | Classical | Yes | ? |
| FM Circini[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 |
| V1662 Scorpii[6] | 2018/02/06 | Scorpius | 16h 48m 49.64s | −44° 57′ 03.0″ | 10.1 | ? | ? | Classical | Yes | ? |
| V3664 Ophiuchi[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 |
| V1663 Scorpii[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 | ? |
| V3665 Ophiuchi[9] | 2018/03/10 | Ophiuchus | 17h 14m 02.55s | −28° 49′ 23.9″ | 9.4 | ? | ? | Classical | Yes | ? |
| V906 Carinae[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 | ? |
| V435 Canis Majoris[11] | 2018/03/24 | Canis Major | 07h 13m 45.90s | −21° 12′ 33.0″ | 12.0 | ? | ? | Classical | Maybe | ? |
| V5857 Sagittarii[12] | 2018/04/08 | Sagittarius | 18h 04m 09.45s | −18° 03′ 55.9″ | 10.8 | ? | ? | Classical | Yes | ? |
| V392 Per[13] | 2018/04/29 | Perseus | 04h 43m 21.37s | 47° 21′ 25.9″ | 6.3 | ? | ? | dwarf nova & nova | Yes | ? |
| V408 Lupi[14] | 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? |
| V613 Scuti[15] | 2018/06/29 | Scutum | 18h 29m 22.96s | −14° 30′ 44.0″ | 10.3 | ? | ? | Classical | Yes | ? |
| V3666 Ophiuchi[16] | 2018/08/08 | Ophiuchus | 17h 42m 24.10s | −20° 53′ 08.8″ | 9.0 | ? | ? | Classical | No | ? |
| V556 Normae[17] | 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]- List of novae in the Milky Way galaxy
- List of novae in 2019
- Nova
- Dwarf nova
- Luminous red nova
- Guest star (astronomy)
- Supernova
Notes
[edit]- ^ In most cases, the spectral type is estimated based on the absolute magnitude
References
[edit]- ^ a b c Mukai, Koji. "Recent Novae". asd.gsfc.nasa.gov. Retrieved 25 January 2019.
- ^ 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.
- ^ "CBET 4473: 20180117 : NOVA MUSCAE 2018". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ "CBET 4481: 20180130 : NOVA SCORPII 2018 = PNV J17180658-3204279". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ "CBET 4482: 20180130 : NOVA CIRCINI 2018 = PNV J13532700-6725110". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ "CBET 4488: 20180212 : NOVA SCORPII 2018 No. 2 = PNV J16484962-4457032". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ "CBET 4489: 20180225 : NOVA IN OPHIUCHUS = PNV J17244011-2421463". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ Stanek, K. Z. "ATel #11348: ASAS-SN Discovery of a Possible Galactic Nova ASASSN-18ds". ATel. Retrieved 25 January 2019.
- ^ "CBET 4492: 20180312 : NEW NOVA IN OPHIUCHUS = TCP J17140253-2849233 = PNV J17140261-2849237". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ "CBET 4498: 20180322 : NOVA CARINAE 2018". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ "CBET 4499: 20180325 : NOVA CANIS MAJORIS 2018 = TCP J07134590-2112330". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ "CBET 4507: 20180412 : NOVA IN SAGITTARIUS = PNV J18040967-1803581". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ "V0392 Per". International Variable Star Index. AAVSO. Retrieved 17 January 2021.
- ^ "CBET 4520: 20180605 : NOVA LUPI 2018 = PNV J15384000-4744500". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ "CBET 4530: 20180703 : NOVA SCUTI 2018 = TCP J18292290-1430460". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ "CBET 4540: 20180813 : NEW NOVA IN OPHIUCHUS = PNV J17422408-2053088". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
- ^ "CBET 4568: 20181026 : NOVA NORMAE 2018 = PNV J16143400-5330050". Central Bureau for Astronomical Telegrams. IAU. Retrieved 25 January 2019.
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