NGC 2099 (Messier 37, M37, Auriga Salt-and-Pepper) an open cluster towards constellation of Auriga

RC 12" Astrograph (LRGB)

25' x 25' FOV

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Bigger size: 1400 px
© Velimir Popov & Emil Ivanov 2020

NGC 2099 (Messier 37, M37) is a very rich open cluster towards the constellation of Auriga. It contains more than 1450 stars and ~460 are detected as variables (Hartman et al., 2009). Investigating variable stars especially eclipsing binary (type EA, EW etc.), delta Scuti (DSCT), high amplitude delta Scuti (HADS) and RR Lyr are important as they could be used as milestone to measure the distances in the Universe and to resolve the stellar physical parameters the internal structure and evolution of stars.

The distance to NGC 2099 measured with precise astrometry by the second Gaia data release is 1.434 kpc or 4.677 kly (Cantat-Gaudin et al. 2018). NGC 2099 has an orbit around the Galactic centre with a period of 219.3 Megayear (Myr) and will cross the Galactic plane after 31.7 Myr (Wu, Zhen-Yu et al., 2009).

Charts and image details obtained from



Image and FOV details

Details for the image
Center of field RA 05:52:16.9 (h:m:s)
Center of field DE +32:32:34.5 (deg:m:s)
FOV 25 x 25 (arcmin)
Pixel scale: 1.04 (arcsec/pixel)

RC 12" Astrograph (IRIDA South dome)

Imaging details

Optic(s): RC 12" with Astro-Physics corrector @ f/5 (RC)
Mount: ASA DDM85 Premium
Camera: ATIK 4000 M
Filters: Astronomik II: Lumиnance
Dates/Times: 2013-08-29
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: LRGB: L: 20 x 1 min R: 20 x 1 min G: 20 x 1 minn B: 20 x 1 min
  Bin 1, Total Exposure Time 80 min
More details: Bias, dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013-2020. All Rights Reserved
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