main SN spectra page
League Table - amateur SNe
discoverers IAUC
list of recent SNe*
*SN
Host Glxy Date
R.A. Decl.
Offset Mag.
Disc. Ref. SN Position
Posn. Ref. Type SN Discoverer(s)
2001bg
NGC 2608 2001 05 08 08 35.3 +28 28
22"E 19"S 14 IAUC 7621
08 35 18.86 +28 28 05.8 IAUC 7621 Ia
2001bg Bole
2001 Aug 1: Tom Boles emails to try for a spectrogram of his new SNe suspect in UGC 913 - Andromeda [see below] but it proves too close to the parent galaxy nucleus and faint at mag15.6 . The galaxy UGC 913 has a recessional redshift velocity of 5400km/s and [in theory] just detectable with the WPO very lo-res spectrograph [Rainbow grating before CCD in non-objective/field mode] by a shift of Ha line, for example, by ~2 pixels.
*SN
Host Glxy Date
R.A. Decl.
Offset Mag.
Disc. Ref. SN Position
Posn. Ref. Type SN Discoverer(s)
2001dk
UGC 913 2001 07 29 01 22.2 +34 40
5"W 3"N 15.6 IAUC 7675
01 22 14.59 +34 40 11.3 IAUC 7675 ?
2001dk Boles
2001
May 17: SNe spectra with the lowest practical dispersion [8.5nm/pixel]
in this set-up with the grating in contact with the CCD window.
Exposure duration approximately halved [to 5m] but still reveals a strong
SiII absorption band of SN type 1a. Pollux [b
Gem] added for comparison shows weak atmospheric absorption lines of A,
a, and B.
2001
May 9: Tom Boles emailed requesting a confirmatory
spectrum on a bright [mag 13] suspect SN he had just discovered in NGC
2608 - his 8th. Cloud precluded observation for 48 hours! Short
exposures via 30cm SCT plus Rainbow grating [dispersion 5nm/pixel] clearly
showed a wide absorption band centred at 611nm [SiII] typical of SNe
type 1a with repeat observations the following evening.
I was pipped to the post by pro spectra taken within 24 hours of discovery
with an IAUC issued designating the object SN 2001bg. Tom's discovery
and 'master' images of NGC 2608 are on 
