Contains:  IC 4715, Omega nebula, M 17, NGC 6618, M 18, NGC 6613, NGC 6603, IC 4701
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vdB114, 116, 117, 120, 121; Sagittarius, 




    

        Thomas V. Davis
vdB114, 116, 117, 120, 121; Sagittarius

vdB114, 116, 117, 120, 121; Sagittarius

Technical card

Resolution: 1650x1100

Astrometry.net job: 2190305

RA center: 273.494 degrees

DEC center: -17.445 degrees

Pixel scale: 8.535 arcsec/pixel

Orientation: 184.733 degrees

Field radius: 2.351 degrees

Data source: Backyard

Description

vdB114, 116, 117, 120, 121; Sagittarius
Takahashi FSQ-106 f/5 refractor
KAI-11000XCM SBIG STL
Total Exposure Time: 2 hours
June 2012; Inkom, ID

Comments: This skyscape shows a region of Sagittarius that has these 5, small van den Bergh objects. They are noted with small arrows and run consecutively left to right. Because they are small, and without much interesting form, I did not shoot higher resolution images of them; the exception is vdB120. M17, the Swan Nebula, is seen in the lower right corner of the main image.

vdB114: Size (arcmin): 1.2
Type: illuminating star inside nebula
Surface brightness: faint
Color: blue
Absorption: moderate
Illuminating star ID1: BD-18 4800
Illuminating star ID2: HD165811
Mag. of illuminating star: 10.26
Spectral type of star: B8/B9Ib

vdB116: Size (arcmin): 0.6
Type: illuminating star inside nebula
Surface brightness: faint
Color: blue
Absorption: moderate
Illuminating star ID1: BD-17 5049
Illuminating star ID2: HD166288
Mag. of illuminating star: 9.86
Spectral type of star: B5Ib

vdB117: Size (arcmin): 2.2
Type: illuminating star inside nebula
Surface brightness: moderate
Color: very blue
Absorption: moderate
Illuminating star ID1: BD-17 5080
Illuminating star ID2: HD167143
Mag. of illuminating star: 9.11
Spectral type of star: B3III

vdB120: Size (arcmin): 1.2
Type: illuminating star inside nebula
Surface brightness: moderate
Color: red
Absorption: moderate
Illuminating star ID1: BD-16 4790
Illuminating star ID2: HD167746
Mag. of illuminating star: 8.69
Spectral type of star: F7II

vdB121: Size (arcmin): 0.6
Type: illuminating star inside nebula
Surface brightness: faint
Color: blue
Absorption: moderate
Illuminating star ID1: BD-17 5141
Illuminating star ID2: HD168418
Mag. of illuminating star: 9.5
Spectral type of star: B2Iab/Ib

Comments

Author

tvdavisid
Thomas V. Davis
License: None (All rights reserved)
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vdB114, 116, 117, 120, 121; Sagittarius, 




    

        Thomas V. Davis