David's Astronomy - Images 2006-05-24 (S00127)

Objects Session Notes

XO-1 - Star

CVn Y - Variable Star

SS Cyg - Variable Star

61 Cygni - Star (the 'flying star')

70 Ophiuchi - Double Star

NGC 3953 - Spiral Galaxy & Supernova 2006bp

CGCG 108-13 - Spiral Galaxy with SN 2006bt

M94 - Spiral Galaxy

NGC 4618 - Spiral Galaxy

- 2.5 hour session

- main aim was to record baseline images of XO-1 and SS Cyg, along with follow up images of SN 2006bp, and SN 2006 bt.

- opportunity was taken to acquire images of M94 and 70 Oph, and positional measurements for Gamma Dra and 61 Cyg.

- More Notes

-

XO-1 - Star with Exoplanet

XO-1 (Corona Borealis)
This star has an extra-solar planet (XO-1b), whose transit can be
detectable as a slight dimming of the sol star.
This will be a future observing challenge

XO-1 : GSC 2041:1657
1 : GSC 2041:186, 2 : GSC 2041:976

Annotated CCD Image
3 x 30s exposure (average combine), 2x2 binning, C Filter
2006-05-24 23:18 hUT (#127028-30)

CVn Y - Variable Star

CVn Y (Canes Venatici) - Red variable star
Large Carbon Star

R Filter

B Filter

CCD Images
Top ::::: 20s, 2x2 binning, R Filter, 2006-05-24 23:41h UT (#127052)
Bottom : 30s, 2x2 binning, B Filter, 2006-05-24 23:38h UT (#127046)

(earlier colour images showing CVn Y's red colouration, 2006-05-08)

SS Cyg - Variable Star

SS Cyg (Cygnus)

Annotated CCD Image
20s exposure, 2x2 binning, C Filter
2006-05-24 23:48 hUT (#127066)

SS Cyg (Cygnus)

Approximate Colour CCD Image (LRGB)
Luminance : 2 x 20s exposure (average combine, C Filter),
Red : 3 x 30s exposure (average combine, R Filter),
Green : 3 x 30s exposure (average combine, V Filter),
Blue : 3 x 60s exposure (average combine, B Filter)
2 x 2 binning
2006-05-24 23:52 hUT (#127066-76)

61 Cygni - Star (The 'flying star')

As part of a ongoing study to attempt to measure proper motion and annual parallax of 61 Cygni a set of images were recorded at 1x1 binning.
( 61 Cygni Project )

61 Cygni (Cygnus)

CCD Image (50% size)
10 x 5s exposure (average combine), 1x1 binning, C filter
2006-05-25 00:09h UT (#127080-93)

Astrometry measurement of 61 Cyg based on 10 images (#127080-93)
1x1 binning, 5s exposure, C Filter

Date/Time (UT)	Star	RA (epoch 2000)		Dec (epoch 2000)
2006-05-25 00:09	61 Cyg A, HIP 104214	21h 06m 56.21s	+/-0.01s	+38d 45m 18.47s	+/-0.06s
2006-05-25 00:09	61 Cyg B, HIP 104217	21h 06m 57.51s	+/-0.01s	+38d 44m 51.45s	+/-0.05s

Errors bars at +/-1 SD

PREVIOUS MEASUREMENTS - BELOW

Date (UT)	Star	RA (epoch 2000)		Dec (epoch 2000)
2006-05-06 01:38	61 Cyg A, HIP 104214	21h 06m 56.21s	+/-0.01s	+38d 45m 18.06s	+/-0.03s
2006-05-06 01:38	61 Cyg B, HIP 104217	21h 06m 57.50s	+/-0.01s	+38d 44m 51.05s	+/-0.03s

Date (UT)	Star	RA (epoch 2000)		Dec (epoch 2000)
2005-10-05 19:09	61 Cyg A, HIP 104214	21h 06m 55.95s	+/-0.00s	38d 45m 16.35s	+/-0.05s
2005-10-05 19:09	61 Cyg B, HIP 104217	21h 06m 57.25s	+/-0.01s	38d 44m 49.49s	+/-0.04s

Comparison from of images from 2005-10-5 & 2006-10-25
showing motion of 61 Cygni over 0.63 year interval
(White bar is 60 arc secs)

70 Ophiuchi - Double Star

70 Ophiuchi (Ophiuchus)
This star is a binary system lying 17 light years from Earth
The system has an orbital period of 88 years, with
the pair swinging between 1.6 and 7.0 arc secs
[ Astronomy Now magazine, June 2006 ]

Ophiuchi 70 (Ophiuchus) - Close up, colour view
The following image shows the two components as two distinct objects separated
by around 5 arc secs and having noticeably different colours.

Primary star : Yellowish (catalog mag +4.2), Secondary star : Reddish (catalog mag +5.9)
Measured Separation 5.2 +/- 0.5 arc sec, PA : 138 deg +/- 5 deg
FWHM 4.5 arc secs

Approximate colour CCD Image (300% size)
Red : 3 x 10s exposure (average combine), R Filter
Green : 3 x 10s exposure (average combine), V Filter
Blue : 3 x 20s exposure (average combine), B Filter
1 x1 binning
2006-05-24 23:18 hUT (#127100-108)

Ophiuchi 70 (Ophiuchus) and neighbouring stars
Ophiuchi 70 and some of the neighbouirng stars comprise the multiple star Struve 2272
The following image shows the Ophiuchi 70 as a bright single object,
due to the white-black range used to show the faint neighbouring stars.

CCD Image (50% size)
3 x 5s exposure (average combine), 1x1 binning, C Filter
2006-05-24 23:18 hUT (#127097-99)

NGC 3953 - Spiral Galaxy & Supernova 2006bp

NGC 3953 (Ursa Major) with SN 2006bp
2006bp was discovered 2006/04/09.60 by Koichi Itagaki
(Rochester Supernova site | Discovery Image | Reference Image)

Image below (2006-05-25.022) was taken 47 days after discovery.
Estimated magnitude of 2006bp is +14.6 (C filter).

(It is noted that the brightness of 2006bp is holding pretty constant and
doesn't appear to be declining as anticipated)

Annotated CCD Image
5 x 60s exposure (average combine), 2x2 binning, C Filter
2006-05-25 00:32 hUT (#127112-16)

NGC 3953 - False Colour

False Colour CCD Image
Image Details as above
Log Scale, False Colour (inverse spectrum)

CGCG 108-13 - Spiral Galaxy & Supernova 2006bt

CGCG 108-13 with SN 2006bt (Serpens Caput)
2006bt was discovered 2006/04/26.48 by Lick Observatory Supernova Search
(Rochester Supernova site | Discovery Image | Reference Image)

Image below (2006-05-24.031) was taken 28.5 days after discovery.
SN 2006bt : estimated magnitude +17.8 (C Filter)
Despite higher noise levels in this image (mag limit +18.0)
the supernova is just detectable and appears to have faded
by 0.8 mag since earlier measurements

CCD Image
4 x 2 min exposure (average combine), 2x2 binning, C Filter
2006-05-25 00:45 h UT (#127120-24)

Earlier image (2006-05-06.029) taken 9.5 days after discovery.
SN 2006bt : estimated magnitude +16.95 (C filter).

CCD Image
5 x 2 min exposure (average combine), 2x2 binning, C Filter
2006-05-06 00:42 h UT (#122196-200)

A light curve has been estimated for SN 2006bt based on my photometry measurements,
plus the recorded magnitude at discovery. Two alternative light curves are shown,
reflecting the uncertainty in the possible interpretation .