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Contains:  NGC 1931, IC 417, The star φAur
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IC417/NGC1931 - The Spider and the Fly, 





    
        

            Ivaylo Stoynov
IC417/NGC1931 - The Spider and the Fly

IC417/NGC1931 - The Spider and the Fly

Technical card

Resolution: 2253x1800

Dates:Dec. 2, 2018March 17, 2019

Frames:Astrodon HII-3nm: 20x900" -40C bin 1x1

Integration: 5.0 hours

Avg. Moon age: 17.72 days

Avg. Moon phase: 52.98%

Astrometry.net job: 2590833

RA center: 82.233 degrees

DEC center: 34.397 degrees

Pixel scale: 2.390 arcsec/pixel

Orientation: 231.950 degrees

Field radius: 0.957 degrees

Locations: Nedelkovo, near Sofia, Bulgaria

Data source: Backyard

Description

The Spider and the Fly "pair" are visually close neighbors of the famous Auriga nebulae "Faming Star" (IC405) and "Tadpoles" (IC410). The smaller object in the upper part of the frame is NGC 1913 (Sh2-237) called the Fly. It is considered as smaller version of the Orion nebula – contains a young cluster, it’s Trapezium, has an emission and reflection parts. The brighter object is IC417 (Sh2-234) which should be the spider who waits for prey, laying in the faint web (personally I see more obvious figure in the lower left angle). IC417 also hosts a young cluster (Stock 8) and the two small clouds above the brightest star hide stellar nurseries. The emission part dominates the region, however with the appropriate imaging time is possible show also the reflections from the hot and massive blue stars. A near infra-red study with Spitzer Telescope shows that the bright wave from the Spider towards the Fly hides packs of young stars that maybe form that interesting shape from the clouds located between them and us.

The distances to the objects in the region show curious facts. The two nebulae are ~500 ly away from each other. Respectively ~7 500 and ~7 000 ly from Earth for IC417 and NGC1931. It looks that there is no direct connection in this “pair” as well as with the neighbors - IC405 ~1 500 ly, IC410 ~12 000 ly away from Earth. The whole complex looks very close just visually, but is spread out on more than 10 000 ly in the Orion-Cygnus arm of Milky Way.

Definitely both the Spider and the Fly are interesting objects alone and in pair, so most likely next winter will get back to them for more data.

Comments

Author

Yoddha
Ivaylo Stoynov
License: None (All rights reserved)
5041
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IC417/NGC1931 - The Spider and the Fly, 





    
        

            Ivaylo Stoynov