NGC 2112, or Collinder 76, is an old open cluster in the Orion constellation. Since it is located near the celestial equator, it is partially visible from both hemispheres during certain times of the year. It was discovered by William Herschel in 1786. It is believed that NGC 2112 is one of the oldest open clusters that we have ever discovered.(Richtler, 1985) In a recent study, it was determined that NGC 2112 cluster radius is significantly larger than previously thought and that it is believed to have lost almost 90% of its initial mass (Gao et al, 2021).

For my analysis of NGC 2112, I used the PROMPT-6 telescope to collect 15 images, 5 images each using the B, R, and V filters. The exposure times were: B = 90.55s, R = 19.69s, V = 35.43s

Using these images in Afterglow, I created the tricolour image shown below.

Using the photometry file that I gathered from Afterglow, I started my Clustermancer Analysis and got the values listen below for my star cluster.

Distance	Log(age)	Metallicity	Reddening	PM RA:	PM DEC:
0.38	9.55	-0.80	0.71	-1.00	1.29

Below are the 4 corresponding graphs to the values above.

I then used the reddening value to created a dereddedned tricolour image of my cluster.

When I compared my values to the MWSC, they were mostly on the right track, except for my metallicity value, which was -0.8, while the MWSC was 0.16, but otherwise I felt my analysis was pretty good for a beginner.

 

Overall, I found this assignment interesting but challenging. It felt good to apply some of the knowledge that I’ve acquired, but there were also some points where I felt that I had no idea what was going on, but it was fun to figure it out.