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 Sky Tour : Ophiuchus (1) - July

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Image collection based on the sky tour "Bearing summertime deep sky gifts" featured in the Jul 2012  edition of Astronomy Now. Comprising star clusters, double stars and planetary nebula in the constellation Ophiuchus
Bullet  1. Barnard 72 - Dark Nebula  (not yet imaged)
Bullet  2. NGC 6369 - Planetary Nebula (Little Ghost Nebula)
Bullet  3. M107 - Globular Cluster
Bullet  4. RS Ophiuchi - Variable Star (not yet imaged)
Bullet  5. M10 - Globular Cluster
Bullet  6. M12 - Globular Cluster
Bullet  7. 70 Ophiuchi - Double Star
Bullet  8. IC 4664 - Open Cluster (not yet imaged)

1.  Barnard 72 - Dark Nebula

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2.  NGC 6369 - Planetary Nebula (Little Ghost Nebula)

NGC 6369 / Herschel IV-11 (Ophiuchus)

Image
CCD Image (70% size reduction)
8 x 20s sec exposure (average combine), 2x2 binning, C Filter
2009-05-26 23:37 h UT (#369086-88)
12" LX200R  (at f/5.7) + ST-10XME
Image at just 6 deg above SSE horizon

NGC 6369 - detail

Image
CCD Image (150% size enlargement, cropped)
Image details as above

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3.  M107 - Globular Cluster

M107 (Ophiuchus) 

Image 
CCD Image 
5 x 60s exposure (average combine), 2x2 binning, C filter,  
2007-04-05  03:39 h UT (#189333-37)
8" LX200 classic + ST-7e

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4.  RS Ophiuchi - Variable Star

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5.  M10 - Globular Cluster

M10  (Ophiuchus)
Image
CCD Image 
4 x 20 sec exposure (average), clear filter
2005-08-14  21:40 h UT (#92063-67)
8" LX200 classic + ST-7e

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6.  M12 - Globular Cluster

M12  (Ophiuchus)
Image
CCD Image 
5 x 20 sec exposure (average), clear filter
2005-08-14  21:51 h UT (#92072-76)
8" LX200 classic + ST-7e

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7.   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
Image
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.
Image
CCD Image (50% size)
3 x 5s exposure (average combine), 1x1 binning, C Filter 
2006-05-24 23:18 hUT (#127097-99)

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8.  IC 4664 - Open Cluster

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This Web Page: Sky Tours - Ophiuchus (1)
Last Updated : 2015-05-16
Site Owner : David Richards
Home Page : David's Astronomy Web Site