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Arp 273 Interacting Galaxies, 



Arp 273 Interacting Galaxies

Technical card

Dates:Dec. 17, 2010

Hubble GREEN F475X: 1x65735" bin 1x1
Hubble RED F600LP: 1x54535" bin 1x1

Integration: 33.4 hours

Avg. Moon age: 10.93 days

Avg. Moon phase: 84.27%

Basic astrometry details job: 2367562

Resolution: 1925x1982

Data source: Professional, scientific grade data


Arp 273 is a pair of interacting galaxies, lying 300 million light years away in the constellation Andromeda. It was first described in the Atlas of Peculiar Galaxies, compiled by Halton Arp in 1966. The larger of the spiral galaxies, known as UGC 1810, is about five times more massive than the smaller galaxy. It has a disc that is tidally distorted into a rose-like shape by the gravitational pull of the companion galaxy below it, known as UGC 1813. The smaller galaxy shows distinct signs of active star formation at its nucleus, and it is thought that the smaller galaxy has actually passed through the larger one. Wikipedia

Data for this image was acquired through the Hubble telescope in December 2010 using the Ultraviolet-Visible channel of WFC3 (Wide Field Camera 3).

The WFC3/UVIS instrument on the Hubble is quite peculiar, in that it comprises two imaging chips, separated by a distance of 30 pixels. As a result, the calibrated and distortion corrected stacks include a 30 pixel "dead-zone" through the middle of them with data missing. To compensate for this, the Hubble acquires a 2nd (slightly offset) image on the next day with the "dead zone" between chips in a slightly different position (see first 2 image revisions).

15 hours of data through the F600LP filter (599->996nm) was mapped to the Red channel.
18 hours via the F475X filter (378->650nm) was mapped to the Green and Blue channels.
UV data was quite weak and extremely noisy, so has been discarded.

To assemble complete images for each filter, a "mosaic scrapbook" approach was adopted using DynamicCrop, NewImage, PixelMath plus a few other processes to match gradients.



License: Attribution Creative Commons


  • Arp 273 Interacting Galaxies, 


  • Arp 273 Interacting Galaxies, 


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    Arp 273 Interacting Galaxies, 




Arp 273 Interacting Galaxies,