Name in the directory:M_33
Category:Galaxy
Right Ascension:1h 33m 51.38s
Declination:+30° 32′ 44.52″
Total Exposure:19 часов 6 минут
Number of Frames:273
Link to FITS files:Download
- G145 minutes (51 frames)
- R186 minutes (75 frames)
- B125 minutes (25 frames)
- L420 minutes (85 frames)
- O100 minutes (10 frames)
- H80 minutes (18 frames)
- S90 minutes (9 frames)
The Triangulum Galaxy (M33) is a spiral galaxy located in the constellation Triangulum, approximately 2.73 million light-years from Earth. It is cataloged under the names Messier 33 and NGC 598. With a diameter of 61,100 light-years, this galaxy is the third-largest in the Local Group of galaxies, after Andromeda (M31) and the Milky Way.
Features
- M33 is the second-largest spiral galaxy in the Local Group, after the Large Magellanic Cloud.
- It is thought to be a satellite of the Andromeda Galaxy or on its way back to it due to gravitational interactions.
- The galaxy's nucleus is classified as an H II type, indicating active star formation.
Origin of the Name
The galaxy gets its name from the constellation Triangulum, in which it can be seen. It is sometimes called the "Pinwheel Galaxy", but this informal name is also used for M101, located in the constellation Ursa Major.
Observability
- Under ideal viewing conditions, away from light pollution, the Triangulum Galaxy can be seen with the naked eye.
- It is the most distant object visible without magnification, surpassing the Andromeda Galaxy (M31) in distance.
- The visual brightness of M33 is 5.72 on the apparent magnitude scale, but it requires a dark sky corresponding to 6.6 on the same scale to be seen.
History of discovery
- The galaxy was probably first discovered by the Italian astronomer Giovanni Battista Audierna before 1654.
- It was rediscovered by Charles Messier on the night of August 25–26, 1764, when it was listed in his catalog as 33.
- In 1784, William Herschel cataloged it and the largest H II region, known as NGC 604, with a diameter of about 1,500 light years.
Contributions to Astronomy
- Observations of variable stars in M33, including classical Cepheids, allowed Edwin Hubble to determine the distance to the galaxy in 1926, confirming that the spiral nebulae are independent galactic systems.
- NGC 604, the largest star-forming region in M33, remains an active subject of study due to its spectral similarity to the Orion Nebula.
| Photo | Date | Frames | Exposure | L | R | G | B | H | N |
|---|---|---|---|---|---|---|---|---|---|
 | 31 May 2021 | 214 | 12:36 | 03:40 | 03:06 | 02:25 | 02:05 | 01:20 | |
 | 12 Jan 2021 | 198 | 08:50 | 00:45 | 02:15 | 02:15 | 02:15 | 01:20 | |
 | 25 Dec 2020 | 213 | 11:05 | 02:15 | 02:30 | 02:30 | 02:30 | 01:20 | |
 | 20 Dec 2020 | 195 | 09:45 | 02:15 | 02:30 | 02:30 | 02:30 | ||
 | 20 May 2017 | 70 | 00:35 | 00:35 | |||||
 | 08 Sep 2015 | 60 | 00:30 | 00:30 |
Visibility chart of Triangulum Galaxy (M 33) during the day
The height diagram of Triangulum Galaxy (M 33) above the horizon during the current day for the observatory observation point in Orenburg (51.7, 55.2). The chart shows when the object is above the horizon and at what maximum height in degrees it rises. The data is relevant for the observation date: Saturday, 26 April 2025.
| Date | Moon Phase | Exposure | CCD Temperature | Gain | Offset | Filter |
|---|---|---|---|---|---|---|
- 2023ixf•
- 40 Eri•
- Abell 74•
- Artemis A868 SA•
- a Canis Minoris•
- C 2020 R4 ATLAS•
- C 2020 T2 Palomar•
- C 2021 S3 (PANSTARRS)•
- Haumea (2003 EL61)•
- HCG 68•
- HCG 92•
- IC 1318B•
- IC 1396•
- IC 1795•
- IC 1805•
- IC 1848•
- IC 1871•
- IC 3322A•
- IC 342•
- IC 4015•
- IC 405•
- IC 417•
- IC 434•
- IC 443•
- IC 4703•
- IC 5070•
- IC 5146•
- IC 63•
- M 1•
- M 101•
- M 103•
- M 109•
- M 13•
- M 15•
- M 27•
- M 3•
- M 33•
- M 42•
- M 45•
- M 5•
- M 51•
- M 57•
- M 63•
- M 64•
- M 74•
- M 76•
- M 81•
- M 82•
- M 86•
- M 87•
- M 94•
- M 97•
- NGC 147•
- NGC 1491•
- NGC 1499•
- NGC 1579•
- NGC 1961•
- NGC 2146•
- NGC 2239•
- NGC 2403•
- NGC 281•
- NGC 4236•
- NGC 4565•
- NGC 4631•
- NGC 507•
- NGC 508•
- NGC 5866•
- NGC 5907•
- NGC 6503•
- NGC 6823•
- NGC 6888•
- NGC 6946•
- NGC 6992•
- NGC 6995•
- NGC 7000•
- NGC 7023•
- NGC 7129•
- NGC 7217•
- NGC 7331•
- NGC 7380•
- NGC 7538•
- NGC 7635•
- NGC 7640•
- NGC 7822•
- NGC 891•
- NGC 896•
- NGC 925•
- PGC 54559•
- Sh2-155•
- Sh2-168•
- Sh2 103•
- Sh2 109•
- Sh2 132•
- T CrB•
- UGC 6930•
- V1405 Cas•
- Vesta A807 FA•