NGC 1893 Tadpoles Nebula (John Leimgruber)

NGC 1893 Tadpoles Nebula

Even noisy photons are better than no photons! So I setup my AP rig right in my driveway in Philadelphia! Light Pollution apps suggest Bortle ~8.2 and measuring with an SQM-L meter gave a sky brightness of 16.5 - 17.0 mag/arcsec^2 (doing my best to block out direct streetlights).

I setup my laptop and batteries inside a cardboard box to keep them warm enough outside with the rig. I stayed warm inside connecting via WiFi remote desktop from my Linux PC and Android Phone.

The first night's subs were accidentally using "Low Conversion Gain" mode and likely under-exposed (higher read noise). I just stacked it all together anyway and it seems to work.

I used N.I.N.A.'s "Three Point Polar Alignment" plugin in manual mode because Polaris is not visible and only about +-15 degrees of zenith has "good horizons" LOL. Typically I use SharpCap Polar alignment at a dark sky site. Guiding was definitely struggling to keep up, but still better than no data.

Auriga is full of my favorite Messier Open Star Clusters for visual observing, and the many nebula are positioned perfectly for imaging. This time of year they pass almost straight overhead which gives me a couple hours window between the trees and buildings.

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

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
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	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

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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.

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