Hemisphere:  Northern  ·  Constellation: Camelopardalis (Cam)

Image of the day 01/09/2020

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    EGB 4 (Ellis-Grayson-Bond 4), 



    
        

            Peter Goodhew
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    EGB 4 (Ellis-Grayson-Bond 4)

    Image of the day 01/09/2020

    Getting plate-solving status, please wait...
      EGB 4 (Ellis-Grayson-Bond 4), 



    
        

            Peter Goodhew
      Powered byPixInsight

      EGB 4 (Ellis-Grayson-Bond 4)

      Imaging Telescopes Or Lenses
      APM Telescopes TMB - LZOS Apo refractor 152/1200
      Imaging Cameras
      QSI 6120wsg-8
      Mounts
      10Micron GM2000HPS II
      Filters
      Astrodon Blue · Lum · Green · Red · Astrodon SII 5nm · Astrodon OIII 3 nm · Astrodon 5nm H-Alpha filter
      Guiding Cameras
      Starlight Xpress Lodestar X2

      Acquisition details

      Frames:
      Astrodon 5nm H-Alpha filter: 56x1800" (28h) bin 2x2
      Astrodon Blue: 15x300" (1h 15') bin 1x1
      Astrodon OIII 3 nm: 25x1800" (12h 30') bin 2x2
      Green: 15x300" (1h 15') bin 1x1
      Lum: 20x600" (3h 20') bin 1x1
      Red: 15x300" (1h 15') bin 1x1
      Integration:
      47h 35'

      RA center: 06h29m34s.235

      DEC center: +71°0436.52

      Pixel scale: 0.533 arcsec/pixel

      Orientation: -6.731 degrees

      Field radius: 0.368 degrees

      More info:Open 

      Resolution: 4150x2734

      Locations: e-Eye, Fregenal de la Sierra, Extramadura, Spain

      Data source: Own remote observatory

      Remote source: e-EyE Extremadura

      Description

      EGB 4 (a nebula discovered by Ellis, Grayson, & Bond in 1984) is NOT a comet, despite it's comet-like appearance. It is an emission nebula surrounding a catacylismic binary star system called BZ Cam in the constellation of Camelopardis.

      It has an unusual bow-shock structure as BZ Cam (with it's associated wind) moves through the interstellar medium, similar to the bow wave in front of a ship that is moving through water.

      BZ Cam is believed to be a white dwarf star that is accreting mass from an accompanying main-sequence star of 0.3-0.4 solar masses.

      It is around 2,500 light years away, and has a space velocity of 125 km/second.

      I can only find one previous image of EGB 4 online, a NASA APOD from 2000, so I believe this could be the first amateur image and the first colour image.

      Yes it's ridiculously faint!

      References:

      apod.nasa.gov/apod/ap001128.html

      THE ASTRONOMICAL JOURNAL, 115:286-295, 1998 January © 1998. The American Astronomical Society.

      aanda.org/articles/aa/full/2001/36/aa1385/aa1385.right.html

      Comments

      Revisions

        EGB 4 (Ellis-Grayson-Bond 4), 



    
        

            Peter Goodhew
        Original
        EGB 4 (Ellis-Grayson-Bond 4), 



    
        

            Peter Goodhew
        B
      • Final
        EGB 4 (Ellis-Grayson-Bond 4), 



    
        

            Peter Goodhew
        C

      B

      Description: star colour

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      EGB 4 (Ellis-Grayson-Bond 4), 



    
        

            Peter Goodhew