David's Astronomy - Images 2007-08-25 (S00207)

Objects Session Notes

NGC 4036 - Spiral Galaxy with Supernova 2007gi

NGC 1058 - Spiral Galaxy

Astrometric & Photometric Monitoring
- SS Cyg (Dwarf Nova)
- BL Lac (Blazar)
- U Her (Mira variable)
- SU UMa (cataclysmic variable)
- Gliese 1245 (nearby star)

- Session duration 3.5 hr

- CCD operation of -15 degC (at 70% average cooling). .

- main objective was to acquire images of selected variable stars and nearby stars for ongoing photometric and astrometric monitoring.

- opportunity was taken to acquire a 1hr 30m run of 15s images of SS Cyg, and follow-up images of two recent Supernovae.

- More Notes

NGC 4036 - Spiral Galaxy with Supernova 2007gi

NGC 4036 (Ursa Major) with SN 2007gi
2007gi is a Type 1a Supernova discovered 2007/07/31.49 by Koichi Itagaki
at mag +16.3, and has brightened significantly through early August.
(Rochester Supernova site | Discovery Image | Reference Image)

Image below (2007-08-25.93) was taken 25 days after discovery.
Estimated magnitude of 2007gi is +13.0 (C filter).

CCD Image
5 x 120s exposure (average combine),
2x2 binning, C Filter, Square root brightness scaling
2007-08-25 22:59 hUT (#207054-58)

NGC 4036 with SN 2007gi - detail

CCD Image - Square Root Scale (200% size, cropped)
Image details as above

NGC 1058 - Spiral Galaxy

NGC 1058 (Perseus)
The bright star like object just to upper right of galaxy centre
is amalgamation of light from a foreground star in our galaxy and
supernova 2007gr in NGC 1058 galaxy.
The image is unable to separate the two objects, but does show
the combined object as being brighter than the object at the same
location in an early image taken in Oct 2003.
(Rochester Supernova site | Discovery Image )