M8 to M20 (Dave Erickson)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: IC 1274 · IC 4684 · IC 4685 · Lagoon Nebula · M 20 · M 21 · M 8 · NGC 6514 · NGC 6523 · NGC 6526 · NGC 6530 · NGC 6531 · NGC 6544 · NGC 6546 · NGC 6559 · The star 7Sgr · The star 9Sgr · Trifid Nebula

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M8 to M20

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M8 to M20

Finally had a chance to complete the data collection and this image after re-fielding the 8" F/2.6 Astrograph.

The astrograph used here is my own optical design, I ground and polished all of the optics, 8" objective asphere, 10" flat fold mirror with central hole. 10" primary mirror asphere, and both lenses for the cemented doublet field lens. A local machine shop did the metal machining, and I used a Clement primary mirror focuser. The tube is a passive athermal design of my own, and the entire OTA was constructed in my garage.

The system, when used in the field , employed home made electronics and control software, a portable UPS system, small field weather station, and SQM for site survey data collection. The electronics and control software for the observatory are home made as well.

The data for this image has been collected over several seasons starting in 2012.

This image is a combination of data collected using several scenarios:

1). camping data taken near Black Rock Ranger Station in the Sierra Nevada mountains at 9,000' SQ 21.9. 2012

2). on site data during construction of my observatory at 6350' SQ 21.83, 2013

3). remote data taken once the observatory was complete, controlled from 220 miles distant. SQ 21.87, 2018

North is to the left.

I used Astronomik RGB, OIII, and Halpha for camping and construction integration scenarios. Then used Astrodon RGB, Halpha for the remote integrations.

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	Distinct awarded users	Total awarded images
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Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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Star trails
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Distribution of data sources

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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
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Amateur hosting facility
Public amaeteur data
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Unknown

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Status	Advanced failed
Started	...
Astrometry.net job	3365795
PixInsight job	AMAHW0BPVU3XQKUAZJUZN9P5ZQ0IYSJT
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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M8 to M20

M8 to M20

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