| refcode | metd | author | reference |
| PTF | (Palomar Transient Factory) | ||
| PTF2013 | A - | Terziev, E., Law, N.M., Arcavi, I., Baranec, Ch., Bloom, J.S., Bui, K., Burse, M., | 2013ApJS..206. 18T |
| PTF2013 | +Ag | Chorida, P., Das, H.K., Dekany, R.G., Kraus, A.L., Kulkarni, S., et al. | |
| PTF2013 | ApJS 206, 18, 2013 |
| coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
| 22576+2258 | PTF 21 | 2012 | 2 | 173 | 3.7 | 15.70 | 17.60 | 225737.67+225829.9 | |||
| 22576+2258 | PTF 21 | 2015 | 3 | 173 | 4.0 | 15.70 | 17.60 | 225737.67+225829.9 | |||
| 22576+2258 | PTF 21 | 2016 | 5 | 173 | 4.0 | 15.70 | 17.60 | 225737.67+225829.9 |