David's Astronomy Pages CCD Images - Session 97 (2005-10-05) Images (S96)   Images (Main)   Home Page   Images (S98)

Notes (S00097)

- 2.0 hour session, slight wind, ambient temperature 12 degC
- Sky conditions deteriorated after 1.75 hours and forced the session to eventually finish
- Aim of session was to record follow-up images on RR Lyrae (RR Lyrae type variable) and Delta Cepheid (Cepheid variable)
 - Opportunity was taken to record images of Ross xxx and monitor AXP stars in Cassiopeia
- More Notes

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61 Cygni - Star (The 'flying star')

As part of a study to attempt to measure proper motion and annual parallax of 61 Cygni more detailed images were recorded at 1x1 binning (initial baseline images during session S95 on 2005-09-30 were at 2x2 binning and would be less accurate) 

Astrometric solution of 61 Cygni (Cygnus) at 2005-10-05   based on 54 UCAC2 stars, image scale 1.31 arc sec/pixel

CCD  Image  10s exposure, V filter 2005-10-05 19:10h UT (#97008)

Astrometry measurement of 61 Cyg based on 6 images (#97004-10), 1x1 binning, 10s exposure

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

Astrometry measurement of 61 Cyg based on 5 images (#97011-15), 2x2 binning, 2s exposure

Date (UT) Star RA (epoch 2000) Dec (epoch 2000)   2005-10-05 19:11 61 Cyg A, HIP 104214 21h 06m 55.95s +/-0.01s 38d 45m 16.53s +/-0.11s   2005-10-05 19:11 61 Cyg B, HIP 104217 21h 06m 57.25s +/-0.01s 38d 44m 49.52s +/-0.14s

Errors bars at +/-1 SD

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Gamma Draconis - Star 

As part of a study to attempt to measure proper motion and annual parallax of Gamma Draconis detailed images were recorded at 1x1 binning (initial baseline images during session S95 were only at 2x2 binning ) . Unfortunately the 5 sec exposure images (through V filter) were too faint to record sufficient USNO B stars for providing a plate solution.    Thus no astrometric positions were recorded for Gamma Draconis.   Future attempt will be made with a longer exposure image.

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Ross 248 (HH And) - Variable Star

Ross 248 (or HH And) lies around 10.3 light years from the sun.  It is a main sequence red dwarf and is variable in brightness.
Baseline images were recorded at 1x1 and 2x2 binning, in order to monitor for annual parallax and proper motion. 

Ross 248 (Andromeda) Also known as HH And

CCD  Image  20s exposure, C filter 2005-10-05  19:27h UT (#97044)

Ross 248 (Andromeda)  Reddish tint to Ross 248 is evident in this approximate true colour image

Approximate CCD  Image  Clear 20s (C Filter), Red 3x 30s (R), Green 3x 30s (V), Blue 3x 60s(B) 2005-10-05  19:35h UT (#97044-59)

Astrometric solution of Ross 248 at 2005-10-05   based on 65 UCAC2 stars, image scale 1.31 arc sec/pixel

CCD  Image  10s exposure, C filter 2005-10-05  19:30h UT (#97047)

Astrometry measurement of Ross 248 (HH And) based on 5 images (#97045-49),  1x1 binning, 10s exposure (C)

Date (UT) Star RA (epoch 2000) Dec (epoch 2000)   2005-10-05 19:29 Ross 248 23h 41m 55.08s +/-0.01s 44d 10m 29.53s +/-0.13s

Errors bars at +/-1 SD

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RR Lyrae - Variable Star

One set images of RR Lyr were recorded through B, V & R filters. Developing cloud caused the session to be aborted preventing the recording of a second / third sets.

RR Lyrae (Lyra) Reference Star (C) SAO 48408,  Control Star (K) SAO 48415

CCD  Image  10s exposure, V filter 2005-10-05  21:08h UT (#97061)

Magnitude Comparison (B & V Filters)  for images taken 3 days apart 2005-10-02 21:03h UT  &  2005-10-05 19:45h UT RR Lyr shows dimming in B & V bands (also in R) Besides dimming RR Lyr shows a slight colour change. B-V graph shows that  the star becomes less blue (ie colder) when it is dim. RR Lyr has a period of around 13 1/2 hrs and thus would be expected  to have dimmed and brightened several times between observations

Examining the magnitudes

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Delta Cepheid - Variable Star (Cepheid)

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AXP Monitoring (4U 0142+615 & 1E 2259+586)

Two Anomalous X-ray pulsers (AXPs),  4U 0142+615 and  1E 2259+586 (both lying in Cassiopeia) were checked for brightening. No indication of activity was observed for either AXP.   

Star field of 4U 0142+615 area  no sign of AXP (mag limit +16.7)
CCD Image 2 min exposure,  C Filter 2005-10-05  20:19h UT (#97176)		Reference Image  (#81089)
Star field of 1E 2259+586 area  no sign of AXP (mag limit +16)
CCD Image 2 min exposure,  C Filter 2005-10-05  20:25h UT (#97181)		Reference Image  (#81094) [ Baseline Images and More Information ]

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