Celestial hemisphere:  Northern  ·  Constellation: Coma Berenices (Com)  ·  Contains:  Coma Pinwheel  ·  IC 3327  ·  IC 781  ·  IC 783  ·  M 100  ·  M 99  ·  NGC 4237  ·  NGC 4254  ·  NGC 4262  ·  NGC 4298  ·  NGC 4302  ·  NGC 4312  ·  NGC 4321  ·  NGC 4322  ·  NGC 4328  ·  NGC 4377  ·  NGC 4379  ·  Virgo Cluster Pinwheel
Messier 99 & Messier 100, 


            Antoine Grelin
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Messier 99 & Messier 100, 


            Antoine Grelin
Powered byPixInsight


Acquisition details

April 28, 2021
Avg. Moon age:
16.34 days
Avg. Moon phase:

RA center: 12h21m35s.30

DEC center: +15°0809.3

Pixel scale: 1.145 arcsec/pixel

Orientation: -17.942 degrees

Field radius: 1.271 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 6545x4580

File size: 11.4 MB

Locations: Las Vegas Desert, Las Vegas Desert, NEVADA, United States

Data source: Traveller


Messier 99 and Messier 100 are two grand design spiral galaxies located in a busy area of Coma Berenices. M99 and M100 are both beautiful objects, and they lie very close to many other galaxies.

We imaged these galaxies from our usual Bortle 4 spot, one hour north from Las Vegas. Midway through the night, our Intel Nuc computer attached to our telescope decided to glitch and crash. This happened when we were both asleep in the trunk of the car. I woke up at 2 AM, sensing that something terrible had happened. I realized that the computer crashed and went out in the cold to reboot it. 

I was very sleepy and just launched SGP/PHD2 very quickly before going back to sleep. Back at home, half of the data was un-stackable and produced such strange artifacts. My guess is that SGP, upon crashing, messed up with the camera settings and so the data taken after 2 AM was with some weird settings. Anyway, the image you will see below is without any darks, flats, or any other calibration frames.

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Sky plot

Sky plot


Messier 99 & Messier 100, 


            Antoine Grelin