Double Quasar SDSS J1723+5904 in Draco (Bruce Van Deventer)

Celestial hemisphere: Northern · Constellation: Draco (Dra) · Contains: NGC 6373 · NGC 6376 · NGC 6377

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Double Quasar SDSS J1723+5904 in Draco

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Double Quasar SDSS J1723+5904 in Draco

Double or binary quasars are a small but interesting percentage from the total quasar population. They differ from lensed pairs in that they are two physically separate but interacting active galaxies. In this case, we have Z=1.6, which is a comoving distance of 15 billion light years, a look-back time of 4 billion years, and a light travel time of 9.6 billion years. This particular pair of galaxies is estimated to be 31 kiloparsecs apart, where the more luminous quasar (active galactic core) has a black hole with a mass of 7 billion solar masses and the smaller has 1 billion solar masses. (ref - 2009ApJ Vol 693 Iss2 pp 1554-1562).

This image is a stack of 20 one minute unguided exposures using a 10" Meade f/10 SCT with no focal reducer. The fainter quasar is at a V magnitude of 20.4 and the brighter is at about 19.6.

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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.

Status	Advanced success
Started	...
Astrometry.net job	6045382
PixInsight job	Y8VY5W3BP972NN1GC8JK26QDLQXZ5C2L
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	17h23m26s.842
RA (top/left)	17h23m07s.785
RA (top/right)	17h20m08s.271
RA (bottom/right)	17h23m46s.504
RA (bottom/left)	17h26m42s.702

Dec (center)	+59°04′25″.84
Dec (top/left)	+58°35′58″.87
Dec (top/right)	+59°17′29″.91
Dec (bottom/right)	+59°32′54″.90
Dec (bottom/left)	+58°51′03″.80

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Double Quasar SDSS J1723+5904 in Draco

Double Quasar SDSS J1723+5904 in Draco

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Image Index:

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Double Quasar SDSS J1723+5904 in Draco

Double Quasar SDSS J1723+5904 in Draco

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