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CCD Images - Session 285 (2008-05-02)

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Images (S286) 		 
Objects Session Notes
Bullet Star Spectra
Bullet Deneb - Star (A2 spectral type)
Bullet R CrB - RCB variable star
Bullet V2491 Cyg - nova
Bullet NGC 4490 - Spiral Galaxy with Supernovae 2008ax
Bullet Astrometric & Photometric Monitoring
- SS Cyg, U Gem (dwarf nova)
- SS Her, U Her (mira variable)
- BL Lac (blazar)
- KR Aur, SY Cnc, AM CVn, AM Her, SZ Her, RZ LMi, DY Per, ER UMa (variables)
- V2491 Cyg (nova)
- Barnard's Star, Gliese 412, Groombridge 34, Groombridge 1618, Groombridge 1830, Lalande 21185 (Nearby Stars)

 
- Late evening session (4.1hr) - poor sky transparency, several images 'lost' due to sky conditions
- CCD operation of -15 degC 
(at 58% average cooling). 
-  main objective was to acquire images of certain selected stars for ongoing photometric and astrometric analysis

Goto Notes from 2008-05-02

Star Spectra

Star Name
(designation) 		Spectra Type
(catalog)

Star Spectra  (Star Analyser 100)
  

 Image details
(1x1 binning)
Spica
Alpha Vir		 B1 Image 5 x 1s (2x2)
2008-05-02 22:51hUT (#285031-35)
Vega
Alpha Lyr		 A0 Image 7 x 0.5s 
2008-04-25 00:08hUT (#284127-31)
Deneb
Alpha Cyg		 A2 Image 5 x 5s
2008-05-03 01:24hUT (#285161-65)
Izar
Epsilon Boo		 A0
??		 Image 5 x 3s 
2008-05-02 23:03hUT (285050-54)
Sadr
Gamma Cyg		 F8 Image 5 x 5s 
2008-05-03 01:18hUT (#285149-53)
     
Star Name
(designation) 		Spectra Type
(catalog)

Spectra Lines  ( Star Analyser 100)
 

 Image Date/No. & Notes
 
Spica
Alpha Vir		 B1 Image 2008-05-02 (#285031-35)
Vega
Alpha Lyr		 A0 Image 2008-04-25 (#284127-31)
Deneb
Alpha Cyg		 A2 Image 2008-05-03 (#285161-65)
Izar
Epsilon Boo		 A0
??		 Image 2008-05-02 (285050-54)
Sadr
Gamma Cyg		 F8 Image 2008-05-03 (#285149-53)

 

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Deneb - Star (A2 spectral type)

Deneb (Cygnus)
Image
Image
Image		 5 x 5s
2008-05-03 01:24hUT
(#285161-65)

 

Repeatability

Image

Spectra Lines  ( Star Analyser 100)

 Image Date/No
Average Image 2008-05-03 (#285161-65)
1 Image 2008-05-03 (#285161)
2 Image 2008-05-03 (#285162)
3 Image 2008-05-03 (#285163)
4 Image 2008-05-03 (#285164)
5 Image 2008-05-03 (#285165)
Intensity
Profiles		 Image (#285161-65)

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R CrB (RCB variable)

R CrB (Corona Borealis)
Low State
Image
Annotated CCD Image
3 x 30s exposure (average combine), 2x2 binning, C Filter 
2008-05-02 23:32 hUT (#285071-73)
 

Earlier image of R CrB 
Normal Bright State
Image
Annotated CCD Image
3 x 30s exposure (average combine), 2x2 binning, C Filter 
2006-06-15 01:21 hUT (#128092-94)

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V2491 Cyg - nova

V2491 Cyg (Cygnus) 
Nova 'V2491 Cyg' was discovered in Cygnus by 
Koichi Nishiyama, Kurume, Fukuoka-ken, Japan, 
and Fujio Kabashima, Miyaki-cho, Saga-ken, Japan, 
on unfiltered CCD images taken 2008-04-10.728 UT 
at magnitude 7.7 (IAU Circular No. 8934)
(AAVSO Special Notice #103)

Image below (2008-05-03.04 UT) was taken 
22.3 days after nova discovery.
Estimated magnitude +11.2 (C)
Image
Annotated CCD Image 
3 x 120s exposure (average combine), 2x2 binning, C Filter 
2008-05-03 00:56hUT (#285129-31)
 
CCD Images showing decline in V2491 Cyg since initial image
Nova is marked by white indicators

V2491 Cyg 
(2008-05-03.04 UT)
22.3 days after nova discovery.
Estimated magnitude +10.8 (C)

 V2491 Cyg 
Earlier Image (2008-04-14.98 UT)
 4.25 days after nova discovery.
Estimated magnitude +8.5 (C)
Image Image
3 x 120s exposure (average combine), 
2x2 binning, C Filter 
2008-05-03 00:56hUT (#285129-31)		 3 x 20s exposure (average combine), 
2x2 binning, C Filter 
2008-04-14 23:48hUT (#281164-66)

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Astrometric and Photometric Monitoring

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This Web Page: CCD Images - Session 285  (2008-05-02)
Last Updated : 2015-05-16
Site Owner : David Richards
Home Page : David's Astronomy Web Site