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M90 in Virgo



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 27 March 2020,  Camera: ST8300M (Baader Lum filter)

and - Scope: Explore Scientific MN152 at f/4.8, Location: DAA Observatory, Shelter Valley, CA, 27 March 2020,  Camera: Atik 383L (Astronomik Gen 2  RGB Filters)

Exposure:  48 x 5 min  (2x2 bin) exposure with UV/IR block filter,  ST8300 Camera, 9.25 Edge Scope

Exposure: 16 x 5 min Red, Green - 14 x 5 min Blue  - (1x1 bin) each RGB, Atik 383L Camera, MN152 Scope

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Subframe calibration - Pixinsight. Subframe integration (Median combine -  Winsorized Sigma Clipping) - PixInsight.  Non-linear stretching and normalization  - PixInsight.  Curves, Levels, RGB combine, Luminance layering - PixInsight.  Final finishing  - Photoshop.  RGB calibration - eXcalibrator. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. Two different optical trains and sensors were used in the data collection for this image. RGB exposures are of a wider FOV and a separate wide field image was made from that data.  Images processed at resolution 3352x2514. Final images are sized at approximately  3000x2250.

North is up in this image.  M90 is the dominant galaxy in this image - a Seyfert type two classed as SAB(rs)ab. The full size image has an image scale of 0.76 arcsec/pixel. M90 is one of the members of the Virgo cluster and is located in the constellation of Virgo. Immediately to its right is  IC3583, a dwarf irregular galaxy.  The two galaxies supposedly constitute a pair with M90 being dominant and IC3583 a satellite. Some have disputed an interaction between the two - mainly because the estimated distance of M90 has a wide variance from 37 to 60  million light years. Also, M90 has the unusual characteristic of a negative redshift (meaning it is actually blue shifted). IC3583 has a normal redshift relative to its independent distance estimate. These objects and some of the brighter stars are identified in the annotated image. This image replaces an earlier image that can be seen in the archives here. Horizontal FOV is approximately 38 arc minutes. Full size image scale is 0.76 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 12h 37m 21s Dec: +1309'48" 


Below is the wide field image from the die field RGB only data. North is to the right in this image. M89 is present in this image in the lower left. These objects and brighter stars are identified in the wide field annotated image.




All images and content remain the property of Jim Thommes - copyright 2003 - 2020

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