Event type | Supernova |
---|---|
Type Ia [1] | |
Date | April 13, 1998 [2] |
Constellation | Ursa Major |
Right ascension | 11h 56m 25.87s [1] |
Declination | +55° 07′ 43.2″ [1] |
Distance | 70.38 ± 0.23 Mly (21.58 ± 0.07 Mpc) [3] |
Redshift | 0.0004, 0.0003, 0.002 |
Host | NGC 3982 [1] |
Colour (B-V) | −0.18 [4] (peak) |
Peak apparent magnitude | 12.36 [1] |
SN 1998aq is a nearby supernova located in the intermediate spiral galaxy NGC 3982, offset 18 ″ west and 7″ of the galactic nucleus. It was discovered April 13, 1998 by amateur astronomer Mark Armstrong [2] and was confirmed by fellow British amateur Ron Arbour; both members of the U.K. Supernova/Nova Patrol. [4] The event was not visible on a prior check by Armstrong made April 7. [5] It reached peak brightness on April 27, and 15 days later had declined by 1.14 magnitudes in the B (blue) band. [4]
Spectroscopic observations determined this was a Type Ia supernova event, and it became one of the best-studied supernova of its type, at least in the visual band. [4] An absorption feature of singly-ionized carbon was (probably) detected nine days before maximum, an indication of unburned ash left over from the original carbon-oxygen core of the progenitor white dwarf. [7] Brightness calibration using Cepheid variables in NGC 3982 gives a peak absolute magnitude estimate of at least −19.47±0.15 (assuming no extinction in the host galaxy). [8]
{{
cite book}}
: |work=
ignored (
help)
Event type | Supernova |
---|---|
Type Ia [1] | |
Date | April 13, 1998 [2] |
Constellation | Ursa Major |
Right ascension | 11h 56m 25.87s [1] |
Declination | +55° 07′ 43.2″ [1] |
Distance | 70.38 ± 0.23 Mly (21.58 ± 0.07 Mpc) [3] |
Redshift | 0.0004, 0.0003, 0.002 |
Host | NGC 3982 [1] |
Colour (B-V) | −0.18 [4] (peak) |
Peak apparent magnitude | 12.36 [1] |
SN 1998aq is a nearby supernova located in the intermediate spiral galaxy NGC 3982, offset 18 ″ west and 7″ of the galactic nucleus. It was discovered April 13, 1998 by amateur astronomer Mark Armstrong [2] and was confirmed by fellow British amateur Ron Arbour; both members of the U.K. Supernova/Nova Patrol. [4] The event was not visible on a prior check by Armstrong made April 7. [5] It reached peak brightness on April 27, and 15 days later had declined by 1.14 magnitudes in the B (blue) band. [4]
Spectroscopic observations determined this was a Type Ia supernova event, and it became one of the best-studied supernova of its type, at least in the visual band. [4] An absorption feature of singly-ionized carbon was (probably) detected nine days before maximum, an indication of unburned ash left over from the original carbon-oxygen core of the progenitor white dwarf. [7] Brightness calibration using Cepheid variables in NGC 3982 gives a peak absolute magnitude estimate of at least −19.47±0.15 (assuming no extinction in the host galaxy). [8]
{{
cite book}}
: |work=
ignored (
help)