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On this page I collect my observations of the spiral galaxy M 99 (Coma Pinwheel Galaxy; NGC 4254) in the constellation Coma Berenices.
The spiral galaxy M 99 (Coma Pinwheel Galaxy) in the constellation Coma Berenices is almost seen face-on, similar to M 100 and M 101, but much smaller than M 101.
In a Vespera mosaic, M 99 can be photographed together with the spiral galaxy M 100 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).
In a Vespera Pro mosaic, M 99 can be photographed together with the spiral galaxies M 100 and M 98 as well as 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 99 (NGC 4254) | M 100 (NGC 4321) | M 98 (NGC 4192) | ||
| Size: 5.3' × 4.6' (Wikipedia) Distance: 60 million light years (Stoyan) Rating: * (Stoyan) |
Size: 7.5′ × 6.1' (Wikipedia) Distance: 60 million light years (Stoyan) Rating: * (Stoyan) |
Size: 11' x 2.7' (SkySafari) Distance: 60 million light years Rating: * (Stoyan) |
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| NGC 4298 (Holm 377) | NGC 4302 (Holm 377) | |||
| 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 99 (Coma Pinwheel Galaxy) in the constellation Coma Berenices (at about the center, a little higher up) (Image Courtesy of SkySafari Astronomy, www.simulationcurriculum.com)
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M 99 - Mar 23, 2020 |
M 99 - Mar 24, 2020 |
M 99 - Mar 25, 2020 |
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M 99 - Mar 23, 2020, processed |
M 99 - Mar 24, 2020, processed |
M 99 - Mar 25, 2020, processed |
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M 99 - Jun 1, 2021 |
M 99 - Jun 1, 2021, processed (Polarr) |
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M 99 with M 100, Jun 8, 2023 - original, 3600s, mosaic |
M 99 with M 100, 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 99 with NGC 4298 and NGC 4302, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic |
M 99 with NGC 4298 and NGC 4302, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic, processed |
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M 99 with NGC 4298 and NGC 4302, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic, processed and denoised (PAI) |
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M 99 with NGC 4298 and NGC 4302, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic, processed |
M 99 with NGC 4298 and NGC 4302, Apr 4, 2025 - 1800, 56 min, 1:1 section from mosaic, processed and denoised (PAI) |
