Celestial hemisphere:  Northern  ·  Constellation: Camelopardalis (Cam)  ·  Contains:  BZ Cam  ·  PGC 19222  ·  PGC 2738254  ·  PGC 2741324  ·  PGC 2743640  ·  PGC 2744423  ·  PGC 2816539  ·  PGC 3085812  ·  PGC 3086252
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EGB 4 (Ellis-Grayson-Bond 4) in a field of Dust, 



    
        

            Niko Geisriegler
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EGB 4 (Ellis-Grayson-Bond 4) in a field of Dust

Getting plate-solving status, please wait...
EGB 4 (Ellis-Grayson-Bond 4) in a field of Dust, 



    
        

            Niko Geisriegler
Powered byPixInsight

EGB 4 (Ellis-Grayson-Bond 4) in a field of Dust

Acquisition details

Dates:
Jan. 11, 2022 ·  Feb. 10, 2022 ·  Feb. 23, 2022 ·  Feb. 24, 2022 ·  March 1, 2022 ·  March 2, 2022 ·  March 3, 2022 ·  March 8, 2022 ·  March 26, 2022 ·  March 27, 2022
Frames:
Baader Blue (B-CCD) 2": 44×240(2h 56′) (gain: 0.00) -15°C
Baader Green (G-CCD) 2": 45×180(2h 15′) (gain: 0.00) -15°C
Baader H-alpha 7nm: 75×600(12h 30′) (gain: 60.00) -15°C
Baader O-III 6.5nm (CMOS-Optimized) 2": 27×420(3h 9′) (gain: 60.00) -15°C
Baader Red (R-CCD) 2": 47×240(3h 8′) (gain: 0.00) -15°C
Baader UV/IR Cut / Luminance 2": 100×180(5h) (gain: 0.00) -15°C
Baader UV/IR Cut / Luminance 2": 415×90(10h 22′ 30″) (gain: 0.00) -15°C
Integration:
39h 20′ 30″
Darks:
16
Flats:
16
Bias:
16
Avg. Moon age:
17.45 days
Avg. Moon phase:
32.83%
Bortle Dark-Sky Scale:
3.85
Mean SQM:
20.33

RA center: 06h31m29s.552

DEC center: +71°1014.72

Pixel scale: 0.774 arcsec/pixel

Orientation: -2.265 degrees

Field radius: 0.789 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 4055x6128

File size: 1.4 MB

Locations: Hinterhofwiese, Gloggnitz, Niederösterreich, Austria; Veitsch, Mitterdorf, Steiermark, Austria

Data source: Traveller

Description

EGB 4 was discovered in 1984 by astronomers Ellis, Grayson and Bond. It is a binary star system named BZ Cam in the constellation Camelopardalis. 

And no, it is still not a comet, rather an emission nebula, because BZ Cam moves with about 125Km/s through the interstellar medium.
This gives the untypical waveform of hydrogen nebulae.

This PN reminds a little bit to HFG1, but this PN has no shock front with OIII.

The idea to photograph this nebula came up in January 2020 when Peter Goodhew presented it for the first time - thank you for this object.
In fact, there are only 2 real astrophotos of this nebula on the web at this time - so I am joining as the third? and the first one with a widefield. 
Also I can confirm that this object is very difficult to expose. Had to go to a darker observing site (SQM 21.65) because my sky at home was too bright for it!

today this picture was chosen as astrophoto of the week (AdW) on astronomie.de
https://forum.astronomie.de/threads/20-woche-egb-4-um-was-fuer-ein-objekt-handelt-es-sich-eigentlich.325202/

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