SN 1998aq
Supernova in the constellation Ursa Major
title: "SN 1998aq" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["supernovae", "astronomical-objects-discovered-in-1998", "ursa-major"] description: "Supernova in the constellation Ursa Major" topic_path: "general/supernovae" source: "https://en.wikipedia.org/wiki/SN_1998aq" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Supernova in the constellation Ursa Major ::
::data[format=table title="Infobox astronomical event"]
| Field | Value |
|---|---|
| name | SN 1998aq |
| event_type | Supernova |
| class | Type Ia |
| start_time | April 13, 1998 |
| constellation | Ursa Major |
| ra | |
| dec | |
| distance | 21.58 ± |
| host | NGC 3982 |
| b-v | −0.18 (peak) |
| peak | 12.36 |
| :: |
| name = SN 1998aq | image = | image_size = | caption = | alt = | names = | event_type = Supernova | class = Type Ia | start_time = April 13, 1998 | duration = | detected_by = | constellation = Ursa Major | ra = | dec = | epoch = | gal = | distance = 21.58 ± | redshift = | source = | remnant = | host = NGC 3982 | progenitor = | progenitor_type = | b-v = −0.18 (peak) | notes = | peak = 12.36 | energy = | website = | predecessor = | successor = | commons = | embedded =
SN 1998aq is a nearby supernova located in the intermediate spiral galaxy NGC 3982, offset west and of the galactic nucleus. It was discovered April 13, 1998 by amateur astronomer Mark Armstrong and was confirmed by fellow British amateur Ron Arbour; both members of the U.K. Supernova/Nova Patrol. The event was not visible on a prior check by Armstrong made April 7. It reached peak brightness on April 27, and 15 days later had declined by 1.14 magnitudes in the B (blue) band.
::figure[src="https://upload.wikimedia.org/wikipedia/commons/2/25/SN1998aq_max_spectra.svg" caption="Spectrum of SN1998aq, a Type Ia supernova, one day after maximum light in the B band"] ::
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. 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. Brightness calibration using Cepheid variables in NGC 3982 gives a peak absolute magnitude estimate of at least −19.47 (assuming no extinction in the host galaxy).
References
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