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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

NGC3310 / SN AT2021gmj - 25.3.2021 at 20.54 - 25.3.2021 at 22.24 Hyvinkää Observation number 97146

Visibility III / V

Timo Inkinen, Ursa (Etelä-Suomi)

On March 25, 2021, I photographed the AT2021gmj supernova from the small NGC3310 galaxy in the constellation Big Bear. Wikipedia provides basic information about that 3′.1 × 2′.4 dimmed “starburst” galaxy, but it is better to link this observation to the observation of the Virtual Telescope website: -candidate-at-2021gmj-in-ngc-3310-Galaxy-an-image-20-mar-2021 /

I turned the full-resolution image into a vertical position so that it was in the same direction as that model image. The second image is a grid-sized image in which I have left a 100% crop of that galaxy in the corner of the image area. The image is a 30: 20: 20: 20 min LRGB image, which means that the total exposure is 90 minutes with my 6 "lens tube.

More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • NGC3310 / SN AT2021gmj
    • Keskitaso
  • Constellation
    • Ursa Major
  • Brightness in magnitudes
    • 12
  • Field of view
  • 45 arc minutes
  • Weather
    • Selkeää, 88% valaistu Kuu oli taivaalla noin 40 asteen päässä tästä galaksista.
  • Darkness
    • Average
  • Seeing
    • Good
  • Galaxies
    • Spiral galaxy info

      Spiral galaxy is a stellar system where there are outwards arched spiral arms from roundish (spiral galaxies) or bar-shaped (barred spiral galaxies) central condensation.

      The apparent shape of spiral galaxied depends on out observation direction. From above they are quite round. From the side they lens-shaped with a bulge in the middle.

      Generally a rather large instrument, good weather conditions and observational expereince are needed to see spiral arms. Usually spiral galaxies look like a fuzzy spots.

      Spiral galaxy M33 in Triangulum. Image Tero Turunen.


      Andromeda Galaxy M31. There are also galaxies M110 (upper right corner) and M32 (lower left corner) in this image. Image Pekka Peura.

      M101 aka Pinwheel Galaxy in Ursa Major. Image Samuli Vuorinen.


      Spiral galaxy IC 342 aka Hidden Galaxy in Camelopardalis. Image Timo Inkinen.

      A sketch of spiral galaxy NGC 7331 in Pegasus. Image Juha Ojanperä.

Technical information

TMB 152 / 1200mm LZOS APO lens tube, ZWO ASI 183MM Pro (2x2 bin), Astrodon LRGB filters and AP 1200 GTO stand.

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