Below is a fairly complete list of stars in the field of NGC 2645 = Pismis 6 = Waterloo 4. The first 11 stars are those of V&M II. The numbering system was extended by FitzGerald et al. (1979A&AS...37..351F) and by Forbes & Short (1994AJ....108..594F). Although basically correct, there is a modest mess in SIMBAD due to a mix of designations and missing photometry and DM names. SIMBAD shows the stars in the core of the cluster with arcsec positions, derived evidently from work preparatory to Hipparcos. (The group was dealt with as though it were a multiple star.) The V&M photometry is not shown for most of the stars, so the BV data is copied below. It appears the photoelectric photometry by FitzG et al. is rather poor, so I show in the second table positions and BV data from the Forbes & Short study. I have cribbed the BV data directly from Jean-Claude's WEBDA pages. I note the presence in SIMBAD of three sorts of names for cluster stars: Cl Pismis 6 1 Cl* Pismis 6 VM 1 Cl* Pismis 6 XXX 9 (Cl* Pismis 6 XXX 11 is the only other example, I think) There are also two Lortet "Dictionary" entries: Cl* Pismis 6 VM (Vogt+Moffat) Write: <> N=11 Object [*inCl] Ref: =1973A&AS....9...97V by VOGT N., MOFFAT A.F.J. Astron. Astrophys., Suppl. Ser., 9, 97-131 (1973) >> Southern open clusters - II - UBV H-beta photometry of 11 clusters between galactic longitudes 259 - 280. -> Table 1: (Nos 1-9). Table 2: (Nos 1-22) No 12 missing. Table 3: (Nos 1-11). Table 4: (Nos 1-14). Table 5: (Nos 1-18). Table 6: (Nos 1-31). Table 7: (Nos 1-4). Table 8: (Nos 1-7). Table 9: (Nos 1-14). Table 10: (Nos 1-9). Table 11: (Nos 1-19). Cl Pismis 6 Write: <> Object [*inCl] N=72 Ref: =1979A&AS...37..351F by FITZGERALD M.P., BOUDREAULT R., FICH M., LUIKEN M., WITT A.N. Astron. Astrophys., Suppl. Ser., 37, 351-360 (1979) >> The open clusters Pismis 6 and 8 and Wat 6. -> = , = , . Table 2: (Nos 1-53), (Nos 1-25), (Nos 1-30). Ref: =1994AJ....108..594F by FORBES D., SHORT S. Astron. J., 108, 594-599 (1994) >> Pismis 6 and the F0 IA supergiant HD 74180. -> (Nos 54-72) All this should be made consistent. Although the cluster is unambiguously NGC 2645, no papers have referred to it by this historically-correct name, so the Pismis 6 designations need to remain for now. SIMBAD does show the NGC designation as the primary one for the cluster itself. It would be good if WEBDA noted that the NGC name is the preferred designation. The revised position for the cluster center is simply the midpoint of the 11 bright V&M stars. Finally, star 44 has motion of 0".14/year (in UCAC1), and the UBV colors clearly indicate this is an unreddened dwarf near type M0. =============================================================================== Coordinates and identifications for stars in NGC 2645 = Pismis 6 version: 23 Nov 2001 source: 1973A&AS....9...97V cluster center = 8 39 03 -46 14.2 (J2000) position sources (column 's'): G GSC-ACT (1999GSCTy.C......0G, I/255) g GSC-2.2 (2001GSC2..C......0S, I/271) U UCAC1 (2000AJ....120.2131Z, I/268) T Tycho-2 (2000A&A...357..367H, I/259) Name RA (J2000) Dec s GSC Tycho-2 V B-V remarks 1 8 39 04.17 -46 13 36.5 T 8151-6261-1 8.85 0.16 HD 73919 2 8 39 04.60 -46 13 46.2 U 8151-6200-1 8.91 0.15 CD-45 4352 3 8 38 58.88 -46 13 37.6 U 8151-5464 8151-5464-1 9.00 0.19 HD 73903 4 8 39 05.72 -46 14 45.5 U 8151-6257-1 9.47 0.17 CD-45 4355 5 8 39 04.34 -46 14 52.1 U 8151-6186 10.58 0.19 CPD-45 2779 6* 8 39 04.22 -46 14 14.3 U 8151-5935 11.49 0.24 CPD-45 2777 7 8 39 01.16 -46 13 49.1 U 8151-5857 11.14 0.26 CPD-45 2774 8 8 38 55.96 -46 13 36.8 U 8151-5953 12.18 0.60 CD-45 4348B 9 8 39 05.66 -46 14 21.4 G 8151-5530 13.79 0.33 NSV 17952 10 8 39 08.42 -46 14 39.8 U 8151-6110 12.25 0.28 CD-45 4351J 11* 8 39 10.98 -46 14 40.9 U 8151-1112 13.16 0.24 Notes 6 CD-45 4351E. 11 Cl* Pismis 6 XXX 11. ------------------------------------------------------------------------------- source: 1994AJ....108..594F FORBES D. and SHORT S. Astron. J., 108, 594-599 (1994) Pismis 6 and the F0Ia supergiant HD 74180. Dictionary: (Nos 54-72) star 29 position from 1996A&AS..116..301R Name RA (J2000) Dec s GSC Tycho-2 V B-V remarks 14 8 39 06.14 -46 15 31.3 U 8151-3538 14.20 0.43 15 8 39 04.01 -46 15 20.0 U 8151-0238 14.29 0.43 16 8 39 02.38 -46 15 46.7 U 8151-1934 13.28 0.37 19 8 38 51.99 -46 14 23.7 U 8151-0212 12.25 1.45 22 8 39 05.89 -46 12 53.0 U 8151-6046 14.08 0.41 23 8 39 10.80 -46 13 05.4 U 8151-0744 13.53 0.39 25 8 39 07.22 -46 14 21.6 U 8151-0392 13.82 0.40 29 8 38 58.50 -46 13 24.0 g 13.78 0.35 33 8 38 55.93 -46 17 00.0 U 8151-5605 13.95 0.86 35 8 39 04.05 -46 17 01.2 U 8151-0570 13.42 0.35 36 8 39 05.67 -46 16 45.3 U 8151-0990 14.08 0.44 39 8 39 14.96 -46 15 45.3 U 8151-2806 13.07 0.43 41 8 39 17.46 -46 15 30.7 U 8151-1396 12.87 0.34 44* 8 39 19.76 -46 14 00.2 U 8151-2496 13.64 1.46 50 8 39 04.17 -46 12 11.0 U 8151-0828 14.40 0.52 51 8 39 00.88 -46 12 05.0 U 8151-0122 8151- 122-1 11.73 0.34 CPD-45 2775 52 8 39 02.16 -46 14 26.0 U 14.93 1.17 53* 14.81 0.87 54 8 38 48.62 -46 16 32.8 U 8151-0882 14.00 1.00 55* 8 38 58.44 -46 18 18.5 U 8151-2888 8151-2888-1 11.07 0.19 CD-45 4349 56* 8 38 32.40 -46 12 11.8 U 8151-0474 8151- 474-1 11.32 0.39 CD-45 4337 57 8 39 29.76 -46 18 15.9 U 8151-3492 8151-3492-1 11.59 1.84 58 8 39 32.14 -46 17 49.7 U 8151-2102 8151-2102-1 9.94 0.17 CD-45 4365 59* 8 39 34.43 -46 18 45.8 U 8151-2834 11.51 0.25 CD-45 4368 60 8 39 35.49 -46 18 40.7 U 8151-2666 13.08 0.35 61 8 39 30.45 -46 18 29.0 U 8151-1430 13.26 0.37 62 8 39 30.35 -46 20 21.1 U 8151-3652 11.95 1.73 63 8 39 34.70 -46 19 45.8 U 8151-1114 12.95 0.63 64 8 39 30.37 -46 19 55.2 U 8151-0662 13.07 0.35 65 8 38 44.38 -46 17 34.6 U 8151-2476 12.25 0.85 66 8 38 38.81 -46 15 51.2 U 8151-3106 13.24 0.63 67 8 38 35.12 -46 15 32.0 U 8151-0280 8151- 280-1 12.84 0.33 68 8 38 34.38 -46 15 10.5 U 8151-1386 13.34 0.37 69 8 39 17.83 -46 10 40.8 U 8151-1248 12.61 0.27 70 8 39 21.68 -46 10 40.6 U 8151-4698 13.41 0.52 71 8 39 25.10 -46 09 14.3 U 8151-3392 12.74 0.50 72 8 39 33.04 -46 09 12.9 U 8151-3088 8151-3088-1 10.20 0.33 CD-45 4366 Notes 44 large proper motion dwarf near M0. 53 not labelled on chart. 55 CPD-45 2773. 56 CPD-45 2760. 59 CPD-45 2795; southwestern/brighter star of 12" pair, also closer faint companion on southeast side.