M3 - Globular Star Cluster
Messier 3 (M3 or NGC 5272) is a globular cluster of stars in the northern constellation of Canes Venatici. It was discovered on May 3, 1764 and was the first Messier object to be discovered by Charles Messier himself. Messier originally mistook the object for a nebula without stars. This mistake was corrected after the stars were resolved by William Herschel around 1784. Since then, it has become one of the best-studied globular clusters. Identification of the cluster's unusually large variable star population was begun in 1913 by American astronomer Solon Irving Bailey and new variable members continue to be identified up through 2004.
Many amateur astronomers consider it one of the finest northern globular clusters, following only Messier 13. M3 has an apparent magnitude of 6.2, making it a difficult naked eye target even with dark conditions. With a moderate-sized telescope, the cluster is fully defined. It can be found by looking almost exactly halfway along the north-west line that would join Arcturus (α Boötis) to Cor Caroli (α Canum Venaticorum). Using a telescope with a 25 cm (9.8 in) aperture, the cluster has a bright core with a diameter of about 6 arcminutes and spans a total of double that.
This cluster is one of the largest and brightest, and is made up of around 500,000 stars. It is estimated to be 11.4 billion years old. It is centered at 32,615.64 light-years (10 kpc) away from Earth.
Messier 3 is quite isolated as is 31.6 kly (9.7 kpc) above the Galactic plane and roughly 38.8 kly (11.9 kpc) from the center of the Milky Way. It contains 274 known variable stars, by far the most found in any globular cluster.
Imaging telescope: Takahashi FSQ130ED
Imaging cameras: ATIK 460EX M
Mounts: Takahashi EM 400 Temma 2
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: EXQ-1.6x
Software: PHD 2, Astro Pixel Processer (APP), PixInsight , Sequence Generator Pro (SGP)
Filters: Astrodon L, R, G & B
Accessories: ATIK EFW2
Original Resolution: 2655 x 2080
Dates: May. 04 & 05, 2021
Frames:
Astrodon Lum: 30 x 120"
Astrodon RGB: 3 x 15 x 120"
Integration: 2 Hours 30 Minutes
Center (RA, Dec): (205.564, 28.375)
Center (RA, hms): 13h 42m 15.298s
Center (Dec, dms): +28° 22' 29.767"
Size: 39.7 x 31.1 arcmin
Radius: 0.420 deg
Pixel scale: 0.896 arcsec/pixel
Orientation: Up is 264 degrees E of N
Many amateur astronomers consider it one of the finest northern globular clusters, following only Messier 13. M3 has an apparent magnitude of 6.2, making it a difficult naked eye target even with dark conditions. With a moderate-sized telescope, the cluster is fully defined. It can be found by looking almost exactly halfway along the north-west line that would join Arcturus (α Boötis) to Cor Caroli (α Canum Venaticorum). Using a telescope with a 25 cm (9.8 in) aperture, the cluster has a bright core with a diameter of about 6 arcminutes and spans a total of double that.
This cluster is one of the largest and brightest, and is made up of around 500,000 stars. It is estimated to be 11.4 billion years old. It is centered at 32,615.64 light-years (10 kpc) away from Earth.
Messier 3 is quite isolated as is 31.6 kly (9.7 kpc) above the Galactic plane and roughly 38.8 kly (11.9 kpc) from the center of the Milky Way. It contains 274 known variable stars, by far the most found in any globular cluster.
Imaging telescope: Takahashi FSQ130ED
Imaging cameras: ATIK 460EX M
Mounts: Takahashi EM 400 Temma 2
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: EXQ-1.6x
Software: PHD 2, Astro Pixel Processer (APP), PixInsight , Sequence Generator Pro (SGP)
Filters: Astrodon L, R, G & B
Accessories: ATIK EFW2
Original Resolution: 2655 x 2080
Dates: May. 04 & 05, 2021
Frames:
Astrodon Lum: 30 x 120"
Astrodon RGB: 3 x 15 x 120"
Integration: 2 Hours 30 Minutes
Center (RA, Dec): (205.564, 28.375)
Center (RA, hms): 13h 42m 15.298s
Center (Dec, dms): +28° 22' 29.767"
Size: 39.7 x 31.1 arcmin
Radius: 0.420 deg
Pixel scale: 0.896 arcsec/pixel
Orientation: Up is 264 degrees E of N
Sky Map
Annotated Image
