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On this page I collect my observations of the spiral galaxy M 100 (NGC 4321) in the constellation Coma Berenices.
The spiral galaxy M 100 in the constellation Coma Berenices is almost seen face-on, similar to M 99 and M 101, but much smaller than M 101.
In the Vespera mosaic, M 100 can be observed together with the spiral galaxy M 99 and many other small galaxies. Between M 99 and M 100 there are the spiral galaxies NGC 4298 and NGC 4302, which form a strongly gravitationally bound pair (Holm 377 or KPG 332).
| M 100 (NGC 4321) | M 99 (NGC 4254) | NGC 4298 (Holm 377) | NGC 4302 (Holm 377) | |||
| Size: 7.5′ × 6.1' (Wikipedia) Distance: 60 million light years (Stoyan) Rating: * (Stoyan) |
Size: 5.3' × 4.6' (Wikipedia) Distance: 60 million light years (Stoyan) Rating: * (Stoyan) |
Size: 2.5' x 1.4' (SkySafari) Distance: 54 million light years (SkySafari) Rating: --- |
Size: 6.0' x 1.1' (SkySafari) Distance: 47 million light years (SkySafari) Rating: --- |
The spiral galaxy M 100 in the constellation Coma Berenices (in the middle, higher up) (Image Courtesy of SkySafari Astronomy, www.simulationcurriculum.com)
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M 100 - Mar 25, 2020 |
M 100 - Mar 25, 2020, processed (Polarr) |
M 100 - Mar 25, 2020, processed (Polarr), potential galaxies marked |
*) Top (from left to right): NGC 4328, NGC 4323; bottom (from left to right): NGC 4312, UGC 7425?, IC 783
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M 100 with M 99, Jun 8, 2023 - original, 3600s, mosaic |
M 100 with M 99, Jun 8, 2023 - large, 3600s, mosaic, processed |
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Evaluation with nova.astrometry.net, large |
Further galaxies: IC 781, IC 783, IC 3177, IC 3238, IC 3244, NGC 4262, NGC 4298, NGC 4302, NGC 4322, NGC 4223, NGC 4328, NGC 4312
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M 98, M 99 and M 100, Apr 4, 2025 - 2100p, 56 min, mosaic |
M 98, M 99 and M 100, Apr 4, 2025 - 2100p, 56min, mosaic, processed and denoised (PAI) |
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M 98, M 99 and M 100, Apr 4, 2025 - 2100p, 56min, mosaic, processed from TIFF |
M 98, M 99 and M 100, Apr 4, 2025 - 2100p, 56min, mosaic, processed from TIFF and denoised (PAI) |
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M 100 with NGC 4312, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic |
M 100 with NGC 4312, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic, processed |
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M 100 with NGC 4312, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic, processed and denoised (PAI) |
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M 100 with NGC 4312, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic, TIFF processed |
M 100 mit NGC 4312, Apr 4, 2025 - 1800, 556 min, 1:1 section from mosaic, TIFF processed and denoised (PAI) |
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M 100 - Mar 23, 2020 |
M 100 - Mar 24, 2020 |
M 100 - Mar 25, 2020 |
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M 100 - Mar 23, 2020, processed |
M 100 - Mar 24, 2020, processed |
M 100 - Mar 25, 2020, processed |
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M 100 - Mar 25, 2020 |
M 100 - Mar 25, 2020, processed |
M 100 - Evaluation with astrometry.net |
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M 100 - Mar 25, 2020 |
M 100 - Mar 25, 2020, processed (Polarr) |
M 100 - Mar 25, 2020, processed (Polarr), potential galaxies marked |
*) Top (from left to right): NGC 4328, NGC 4323; bottom (from left to right): NGC 4312, UGC 7425?, IC 783
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M 98, M 99 and M 100, Apr 4, 2025 - 2100p, 56 min, mosaic |
M 98, M 99 and M 100, Apr 4, 2025 - 2100p, 56min, mosaic, processed and denoised (PAI) |
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M 98, M 99 and M 100, Apr 4, 2025 - 2100p, 56min, mosaic, processed from TIFF |
M 98, M 99 and M 100, Apr 4, 2025 - 2100p, 56min, mosaic, processed from TIFF and denoised (PAI) |
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M 100 with NGC 4312, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic |
M 100 with NGC 4312, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic, processed |
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M 100 with NGC 4312, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic, processed and denoised (PAI) |
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M 100 with NGC 4312, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic, TIFF processed |
M 100 mit NGC 4312, Apr 4, 2025 - 1800, 556 min, 1:1 section from mosaic, TIFF processed and denoised (PAI) |