Sh2 173 Phantom of the Opera (and little 172) (Jerry Yesavage)

Sh2 173 Phantom of the Opera (and little 172)

Revisiting my old friends with the new camera.

From GalaxyMap:

Russeil combines Sh 2-172, Sh 2-173 and Sh 2-177 into one star formation region. All three nebulae lie in the direction of the expanding shell of gas and dust surrounding the Cas OB5 association.

Russeil identifies 7 possible ionising stars for Sh 2-173, the hottest of which is the O9 V star ALS 6151 (BD +60 39).

Avedisova associates Sh 2-173 with the star cluster NGC 103, the radio source KR 98, and the dark nebula LDN 1282.

Sh 2-173 appears to be on the edge of the HI shell GSH 117.8+1.5-35 associated with Cas OB5.

GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>

There are 313 Sh2 objects. As of the date of this image I had imaged 310 (99%).

Here is the scorecard:

There are 11 too diffuse/large to image well with my set up (Sh2 111, 117, 122, 131, 132, 145, 178, 218, 230, 268 and 310). I have imaged the first 6 of these mostly in the Nikon Wide angle shot referenced below and 178 and 230 as part of other images. I will do the rest at least once as they come into view this year. I missed 303, 304 310 last year running out of time. So there are these 3 more to do here.

There are 5 that are never above 14 DEG (Sh2 2-6) but as of 7/12/21 I can get these now with pier upgrades and the images are completed as best as I can.

The 3 remaining all are in Expert Scheduler waiting for them to pass by. They are all higher elevations.

The first one was taken on December 23, 2013.

Many were taken with my old Tak 180 ED, which had a wide field of view, but was replaced with my Stellarvue 130, which is more narrow field. I have also taken two very wide field HA images with my Nikon D800 and a 50mm lens. I transitioned from my CCD SBIG 8300M to a CMOS ZWO ASI6200M Pro in September 2021.

This is my collection:

Sharpless2

Wide-Angle Hydrogen Alpha Nikon Image Sh2 79-171

Please note there is also a Sharpless2 Group with now more than 1500 examples.

Sharpless2 Group

Other useful links include:

Gary Imm's Collection

GalaxyMap's Collection

The Sharpless Catalog

The MDW H-alpha Sky Survey

Reiner Vogel's detailed observing catalog

Hope you enjoy these obscure but interesting objects...

Original
B
Final
C

B

Description: HA RGB version

Uploaded: ...

C

Description: I seem to like the greyscale cropped the best.

Uploaded: ...

Sharpless2 Objects
Cloudy Nights

Sharpless2 Objects

	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	5063533
PixInsight job	5H34A4GS54OVTXGMOQN5DVTWYZW7XCZS
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h22m21s.146
RA (top/left)	00h18m56s.660
RA (top/right)	00h19m05s.280
RA (bottom/right)	00h25m41s.455
RA (bottom/left)	00h25m41s.156

Dec (center)	+61°46′04″.85
Dec (top/left)	+62°05′20″.62
Dec (top/right)	+61°25′51″.37
Dec (bottom/right)	+61°26′29″.90
Dec (bottom/left)	+62°05′58″.83

Image Index:

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