Mark A1
- Unique Name: Mark A1
- RA: 20 43 58.451
- Dec: -10 47 12.27
- Mag. V: 15.911
- Mag. B-V: 0.609
- Mag. U-B: -0.014
- Mag. V-R: 0.367
- Mag. R-I: 0.373
- Mag. V-I: 0.74
- N: 25.0
- M: 10.0
- Mean error of the mean V: 0.004
- Mean error of the mean B-V: 0.009
- Mean error of the mean U-B: 0.014
- Mean error of the mean V-R: 0.004
- Mean error of the mean R-I: 0.013
- Mean error of the mean V-I: 0.015