David's Astronomy Pages CCD Images - Session 98 (2005-10-08) Images (S97)   Images (Main)   Home Page   Images (S99)

Notes (S00098)

- Marathon session (10 hours), clear sky all night, generally calm (minor breeze at times), ambient temperature 8 degC dropping to 3 deg C.
- Aim of session was to record images on RR Lyrae through around 5 hours of its 13.6 hr period.   
- In the event around 8 hours of RR Lyrae data was recorded (59% of total period) and subsequent processing showed that the rise from minimum to maximum was nicely captured.
- Opportunity was taken to record Mosaic images of M44 & M39, detailed images of M1 and photometric images of Delta Cepheid. 
- Total of 1258 frames were recorded including dark frames  (Session 98 includes image numbers up to 99260)
- Total light frame exposure time was 5.2 hours.
- Mars was a brilliant object all night long.  It was tempting to image it, but this was not feasible due to the need to swap out my current wide field optical system (focal reducers / with current BVR filters) and replace by narrow field optical (with barlow and RGB filters). Mars is down on the list for imaging in the very near future.

- More Notes

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RR Lyrae - Variable Star

An alternating sequence of  V Filter (10s exposure) and B Filter (20s exposure) images were recorded over an 8 hour interval.  Image capture was via automated scripts, however occasional manual intervention was required to keep both RR Lryae and the reference star with field of view and at one point to remove dew which had formed on the front lens of the LX200 scope.

The dataset records the rapid brightening of RR Lyrae over a 1.5 - 2 hour interval, followed by a gradual dimming as the star proceeded through its regular period.

Images
RR Lyrae (Lyra) [reference star SAO 48408, control star SAO 48415 ]
CCD  Image (at Minimum) 10s exposure, V filter 2005-10-08  20:51h UT (#98250)	CCD  Image (just after Maximum) 10s exposure, V filter 2005-10-08  23:15h UT (#98552)
	Maximum brightness was not accurately captured  due to condensation/dew forming on the front  the telescope (the dew shield having been removed  due to wind vibration). The image on left is taken at around maximum, but is  clearly, this was due to condensation which had  temporarily formed on the front of the telescope However after clearing the dew the brightened  nature of RR Lyr was evident even looking  at raw realtime images.
CCD  Image (at near Maximun) 10s exposure, V filter 2005-10-08  20:51h UT (#98250)
Magnitude Data (B & V Filters)
RR Lyrae Photometric Analysis Notes including data QC

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Delta Cepheid - Variable Star (Cepheid)

Two sequence of images of Delta Cepheid  &reference star were recorded at around 03:00h UT (2005-10-09) and 04:26h. These were analyzed using the methodology described under 2005-10-05 Notes. 

B Band Magnitude estimates for Delta Cepheid  from images between 2005-10-02 and 2005-10-09 (Reference Star SAO 34542, B mag +3.81)

Further observations will be made during future sessions  in order to further refine the light curve

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M39 - Open Cluster

M39 (Cygnus)

Central portion of a CCD Image Mosaic (5x3,  15 Frames) 20 sec exposure,  R Filter 2005-10-09 03:16 h UT  (#99084-98 {S98} ) (Full Size)

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UGC 1990 - Galaxy with possible supernova (2005ev)

UGC 1990 (Aries)  [ alt name PGC 9579, catalog mag +15.8 ] A mag +16 supernova (2005ev) has been reported in UGC on 2005-10-04 at position  02 31 04.93 +27 42 06.5 CBET 244 )

CCD Image (negative) 3 x 60 sec exposure (average), C filter 2005-10-09  03:30 h UT (#99111-13 {S98} )

Enlargement of UGC 1990 The object indicated by the cross-hairs lies at the position  of the reported supernova 2005ev

CCD Image  (details as above)

DSS Reference Image showing same field of view An object appears at the northern end of UGC 1990, but in a slightly  different position  (was this an earlier supernova ?)

[ DSS Image, converted to grey scale & cropped ]

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M44 - Open Cluster (Beehive Cluster)

M44 (Cancer)

Central portion of a CCD Image Mosaic (8x5,  40 Frames) 20 sec exposure,  C Filter 2005-10-09 03:50 h UT  (#99115-59 {S98}) (Full Extent (1/2 size) /  Original Full Size)

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RT Auriga - Variable Star

RT Auriga / SAO 59128  (Auriga)

CCD Colour Image (Approximate Colour) Red : 3x30s (av, R Filter), Green : 3x30s (av, VFilter) Blue : 3x60s (av, B Filter) 2005-10-09 04:17 h UT  (#991163-72 {S98})

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M1 - Supernova Remnant (Crab Nebula)

M1 (Taurus)

CCD Image (50% size) 14 x 60 sec exposure (average), 1x1 binning, C filter 2005-10-09  04:43 h UT (#99235-48 {S98} ) (Full Size)

False Colour CCD Image (cropped)  Linear Scale,  blkbdy color table Details as above, (Full Size)

False Colour CCD Image (cropped) Unsharp masked sharpening (real time video style colouration) (Full Size)

Negative CCD Image (cropped) with Gamma Correction to highlight features Details as above (Full Size)

M1 showing CM Tau - the pulsar at heart of Crab Nebula

Annotated  CCD Image (150% size, cropped) Richardson-Lucy sharpened Image details as above   [ Interenet picture of Pulsar CM Tau on web at http://www.scioly.org/eventpages/ ]

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