220p 20260709 dbartlett

Two Comets Same FOV from July 09 2026
3 hours ago 18 views4106×245013.44 MB
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Dan Bartlett
Backyard
My Back Yard, June Lake (Ca), US
Bortle
2
N
Psc
1h 38m 8s · +6° 55' 40?
2.86° × 1.70°
2.50?/px
0.82°N
Comet·One-shot color
Comets Imaging
Integration
No filter
	
49×180?
	
2h 27'
	
9 Jul
	
31%
Equipment
Telescope
	
Celestron RASA 11"
Cameras
	
ZWO ASI6200MC Pro
ZWO ASI6200MM Pro
Mount
	
10Micron GM2000 HPS II
Software
	
Main Sequence Software Sequence Generator Pro (SGP)
Pleiades Astrophoto PixInsight
Objects
NGC 638
Description

Project Notes:

    Fast moving (9254"/day) P/2021 N1 ZTF(bottom left) can be seen in the same field as 220P/ McNaught(2196"/day)..

    Moonlight gradients pose significant processing challenges and reduction of cometary brightnessses..

    180 second exposures caused over 15"/pix trailing for comet P/2021 N1 ZTF.

  

Observational details:

    Backyard setup

    2xscopes Tandem: RASA11 D = 279mm; fl =620mm; F# 2.2

    camera: asi6200mmP and asi6200mcP

    Seeing: 3/5

    Transparency: 7/10 moonlight

    Observer: DEBartlett

    Location: June Lake, California, USA

Image Info:

(All images processed solely using PixInsight and Comet Photometry Tycho-Tracker)

    Full Frame Resampled 2x2

    Acquisition...............49x180sec total

    Resolution ............... 2.503 arcsec/px

    Rotation ................. -0.813 deg

    Reference system ......... ICRS

    Observation start time ... 2026-07-09 11:08:04 UTC

    Focal distance ........... 619.59 mm

    Pixel size ............... 7.52 um

    Field of view ............ 2d 51' 19.1" x 1d 42' 13.4"

    Image center ............. RA: 1 38 08.407 Dec: +6 55 39.88