0436-03 Supernova 1999em in NGC 1637
Active Dates: Oct. 29, 1999 – Dec. 1, 1999
Abstract:
W. D. Li on behalf of the Lick Observatory Supernova Search team reports the discovery of a bright supernova in NGC 1637 on October 29.44 UT at an unfiltered CCD magnitude of about 13.5 using the 0.8-m Katzman Automatic Imaging Telescope. Confirmed by BAO on October 20.45 UT. Spectroscopic confirmation by M. Calkins revealed SN 1999em to be a Type II supernova with a very blue continuum with P-Cyg profiles of H-alpha, H-beta, H-gamma, and He I.
Justification:
Observations are requested to further analyze the early Type II supernova SN 1999em, which is confirmed to exhibit a very blue continuum with P-Cyg profiles of H-alpha, H-beta, H-gamma, and He I. The spectrum also shows narrow interstellar Na I D at the redshift of NGC 1637, implying possible partial obscuration by dust.
Requested Data Types:
Spectroscopy, Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| SN 1999em | 13.50 | SN II |
Cadence: Not Specified Precision: 100 |
Cadence: Not Specified Resolution: 250 Desired SNR: 100 |
Spectroscopy Lines:
H-beta (4861.0 Å), He I (5876.0 Å), Sodium Doublet (5890.0 Å), H-alpha (6563.0 Å)
Photometry Filters:
B (Johnson), V (Johnson)
Comparison Stars:
No comparison stars provided
Co-Authorship
Observers are not eligible for co-authorship.
Additional Observer Input:
Not provided
Additional Submission Location:
Not provided
Forum URL
N/A
Notes:
Principal Investigator: W. D. Li; Imported Campaign (Alert Notice #263)