Deep Sky Object in Autumn
M33 (Galaxy in Triangulum)
Click on image to enlarge
| Date & Time: | Nov 27 2011, from 23:26 to 23:56 JST(+0900) |
| Composed 4 shots with 10 minutes exposed |
| Optical: | TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3) |
| with Astronomik CLS-CCD filter |
| Auto-guided with TAKAHASHI JP Equatorial & SBIG STV |
| Digital Camera: | Canon EOS 550D (Remodeled) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Camera Settings: | Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456) |
| CCD Sensitivity...ISO1600 |
| M33 (NGC598) / Galaxy, type SA(s)cd II-III |
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| R.A. | 01h 33m 50.9s (2000.0) |
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| Dec. | +30° 39' 37" (2000.0) |
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| Apparent Size | 70.8×41.7' |
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| Radial Velocity | -46km/s |
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| Magnitude | 6.7 |
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| Distance | 2.6 million light yrs. |
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| Group of Galaxies | Local Group of Galaxies |
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| Other IDs | UGC1117, MCG5-4-69,
PGC05818 |
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M33 (NGC598) is a very large (about two times of the Moon) but quite faint face-on spiral galaxy at just Andromeda's left foot.
The galaxy is about 2.6 million light years away, and one of main members consist of the Local group of galaxies, that includes our Galaxy.
Visible magnitude of the galaxy is about 6.7, but it's probable to recognize that with naked eyes under the clear and dark sky.
It's considered that M33 and our Galaxy have about same shapes, and plenty of diffused nebulae or globular clusters have been discovered in M33,
many astronomers are researching into the galaxy in detail.
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Click on image to enlarge
Close-up of M33
| Date & Time: | Dec 8 2023, from 21:57 to 22:53 JST(+0900) |
| Composed 8 shots with 8 minutes exposed |
| Optical: | Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3) |
| with IDAS LPS-P1 Light-pollution suppression filter |
| Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN |
| Digital Camera: | Nikon D810A |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Camera Settings: | Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080) |
| Device Size...20×20mm |
| Sensitivity...ISO4000, White Balance...Daylight |
| NGC595 / Diffused Nebula, type E |
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| R.A. | 01h 33m 34.0s (2000.0) |
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| Dec. | +30°41' 36" (2000.0) |
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| Apparent Size | 0.8×0.7' |
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| Real Size | approx. 700 light yrs. |
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| Magnitude | - |
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| Distance | 2.6 million light yrs. |
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| Other IDs | - |
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| NGC604 / Diffused Nebula, type E |
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| R.A. | 01h 34m 32.7s (2000.0) |
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| Dec. | +30°47' 02" (2000.0) |
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| Apparent Size | 1.5' |
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| Real Size | 1500 light yrs. |
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| Magnitude | - |
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| Distance | 2.6 million light yrs. |
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| Other IDs | - |
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In addition to being located at a close distance, M33 is a nearly face-on galaxy, allowing us to observe numerous Hα nebulae scattered along its arms.
Some of these have catalog numbers assigned to them. The most prominent one, NGC604, is situated within an arm approximately 12 arc minutes northeast of the center of M33,
with an apparent size of about 1.5 arc minutes.
It's considered that NGC604 is the largest Hα region within galaxies belonging to the Local Group,
it boasts an actual diameter of up to 1500 light-years, surpassing the Great Orion Nebula (M42) in our Milky Way Galaxy by 40 times. This photograph,
including those without assigned numbers, provides insight into the distribution of nebulae of various sizes and shapes throughout M33.
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