Milky Way Core to Rho Ophiuchi (Andrew Klinger)

Celestial hemisphere: Southern · Constellation: Ophiuchus (Oph) · Contains: Hourglass nebula · IC 4592 · IC 4604 · IC 4605 · IC 4701 · IC 4715 · Lagoon nebula · M 17 · M 20 · M 7 · M 8 · NGC 6281 · NGC 6334 · NGC 6357 · NGC 6383 · NGC 6475 · NGC 6514 · NGC 6523 · NGC 6526 · NGC 6618 · Omega nebula · Part of the constellation Ophiuchus (Oph) · Part of the constellation Sagittarius (Sgr) · Part of the constellation Scorpius (Sco) · The star Antares (αSco) · The star Dschubba (δSco) · The star Graffias (β1Sco) · The star Kaus Australis (εSgr) · The star Lesath (υSco) · The star Media (δSgr) · And 6 more.

Milky Way Core to Rho Ophiuchi, Andrew Klinger

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Milky Way Core to Rho Ophiuchi

Powered byPixInsight

Milky Way Core to Rho Ophiuchi

Equipment:

Lens: Rokinon 24mm f/1.4 (stopped to f/4)

Mount: Orion Sirius EQ-G (HEQ-5)

Imaging camera: ZWO ASI1600MM-Cool

Software:

SGP

PHD2

CdC

PixInsight

Acquisition:

Location: Atoka, Oklahoma (Bortle 3)

Dates: 5/12/18

Gain: 76 Offset: 15

Camera temp: -10C

R: 9x180"

G: 10x180"

B: 10x180"

Total integration time: 1hr 27min

64x darks per calibration (master dark in library)

No flats (had issue with them)

200x bias (master bias in library)

Preprocessing:

Batch PreProcessing script to generate calibrated images

StarAlignment to register all frames to a reference

DynamicCrop each master

DBE on each master

RGB processing:

BackgroundNeutralization

ColorCalibration

SCNR green 50%

TGV and MMT noise reduction (via Jon Rista's method)

ArcsinhStretch and HistogramTransformation

SCNR green 100%

Duplicated the image to create a starless version, using a starmask and several iterations of MMT and MT. Then pushed the faint nebulosity in the starless version using PixelMath expression: "1-(1-$T)*(1-$T)".

Combined the starless version with the image using PixelMath expression "F=0.4; (1-(1-$T)*(1-s)*F)+($T*~F)" followed by the same expression but F=0.2 (s=starless photo).

CurvesTransformation for saturation

ExponentialTransformation with a mask to further push faint nebulosity

ColorSaturation to selectively saturate blues

MorphologicalTransformation for slight star reduction

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.

Status	Basic success
Started	...
Astrometry.net job	2060629
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Contribution Index (beta):

Milky Way Core to Rho Ophiuchi

Milky Way Core to Rho Ophiuchi

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Image Index:

Contribution Index (beta):

Milky Way Core to Rho Ophiuchi

Milky Way Core to Rho Ophiuchi

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

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