Ber 59 The star cluster Ber 59 is embedded in the gas and dust complex Ber 59 Sharpless 171/NGC 7822. It is called NGC 7822 by some authors, but we Ber 59 prefer Lynga's notation. Col 121 HIP 33316, HIP 33846, HIP 34444, HIP 34489 and HIP 34954 are Col 121 non-members due to their large angular distance from the cluster Col 121 centre. On the basis of their proper motions, they may be part of an Col 121 unbound association of stars which shares the same kinematics Col 121 as Col 121. Col 132 It is not clear whether this is a true star cluster, see Claria Col 132 (1977A&AS...27..145C) and Eggen (1983AJ.....88..197E). Members and Col 132 non-members are taken from Baumgardt (1998A&A...340..402B). Col 135 There is some discussion in the literature about the existence of this Col 135 cluster. The Hipparcos () data strongly supports its reality, Col 135 see Baumgardt (1998A&A...340..402B). Members and non-members are taken Col 135 from this work. Col 140 The membership of HIP 35905 in this cluster is well established (see Col 140 for example Williams, 1978MNRAS.183...49W and Jenkner & Maitzen, Col 140 1987A&AS...71..255J). Nevertheless its proper motion deviates strongly Col 140 from the other members. We therefore did not use it to determine the Col 140 mean cluster motion. Col 197 There is an apparent clustering of possible members in the TRC Col 197 Catalogue () near ({mu}_{alpha}_*/{mu}_{delta}_)=(-3/9)mas/yr. Col 197 Since the proper motion of HIP 42908 is Col 197 ({mu_{alpha}_*/{mu}_{delta}_)=(-6.85+/-0.82/3.22+/-0.87)mas/yr Col 197 it cannot be a member. Col 359 The most recent study of this cluster was made by Rucinski Col 359 (1987PASP...99..487R), who found 9 probable members and a distance Col 359 modulus of V-M_V_=8.2mag. Seven of the possible members are included Col 359 in the Hipparcos Catalogue, but only two share a common proper motion. Col 359 Three other Hipparcos stars may be additional cluster members, but the Col 359 reality of the cluster seems doubtful. Col 394 Concerning the membership of BB Sgr (HIP 92491) see the discussion in Col 394 the text. HM 1 The cluster Havlen-Moffat 1. Hog 14 It is not clear whether this cluster exists, see Moffat & Vogt Hog 14 (1973A&AS...10..135M). According to these authors, HIP 60863 could be Hog 14 a member if the cluster is real. IC 1848 The Hipparcos proper motion of HIP 13308 is incompatible with the IC 1848 assumption of cluster membership. The star is nevertheless almost IC 1848 certainly a cluster member on the basis of its radial velocity (Liu IC 1848 et al., 1991AJ....102.1103L) and UBV photometry. In addition its TRC IC 1848 proper motion is close to that of the other members. We therefore IC 1848 consider HIP 13308 to be a member but have not used it to derive IC 1848 the mean cluster motion. IC 2395 The Hipparcos stars show no evidence for a clustering. There is IC 2395 however a clustering of the possible members in the TRC Catalogue IC 2395 near ({mu}_{alpha}_*/{mu}_{delta}_)=(-4/1)mas/yr. Keeping this in IC 2395 mind, we made the classification of the Hipparcos stars. IC 2944 HIP 56134, HIP 56890, HIP 56961 and HIP 57057 are not considered to be IC 2944 cluster members due to their large angular distance from the cluster IC 2944 centre. On the basis of their proper motions, they may be part of an IC 2944 unbound association of stars which shares the kinematics of IC 2944. IC 4665 HIP 86944 and HIP 87184 are almost certainly members on the basis of IC 4665 their radial velocity, ground-based proper motion (Prosser, 1993, IC 4665 Cat. ) and photometry. In addition their TRC proper IC 4665 motions are consistent with cluster membership. The most likely IC 4665 explanation is that the Hipparcos proper motions are disturbed by IC 4665 binary effects. They were not used to determine the mean cluster IC 4665 motion. Mel 227 Mel 227 + NGC 1252: These are not open clusters, see the discussion Mel 227 in Baumgardt (1998A&A...340..402B). NGC 1252 See Mel 227 NGC 654 HIP 7936 is regarded as a possible member since it has a 92% NGC 654 membership probability in the proper motion study of Stone NGC 654 (1977A&A....54..803S). NGC 1647 Concerning the membership of SZ Tau (HIP 21517) see the discussion in NGC 1647 the text. NGC 1907 Glushkova & Rastorguev (1991PAZh...17..149G) found several giants with NGC 1907 V-magnitudes between 11.9 and 12.5 mag to be cluster members. Except NGC 1907 for HIP 25599, all Hipparcos stars are therefore too bright to be NGC 1907 cluster members. HIP 25599 may be a cluster member in the blue NGC 1907 straggler phase. NGC 2129 The existence of this cluster is doubtful, see Pena & Peniche NGC 2129 (1994RMxAA..28..139P). However, the radial velocities (Liu et al., NGC 2129 1991AJ....102.1103L) and the proper motions of the two Hipparcos stars NGC 2129 agree with each other. This may be a hint for the reality of the NGC 2129 cluster. NGC 2251 The membership of HIP 31365 in this cluster is uncertain, NGC 2251 see Maitzen et al. (1981A&A....96..174M). NGC 2362 HIP 35461 was considered to be a cluster member by Perry NGC 2362 (1973IAUS...50..192P) on the basis of its UBV photometry. Its NGC 2362 Hipparcos proper motion differs considerably from the other stars. NGC 2362 Since the star is known to be double, the Hipparcos proper motion may NGC 2362 be in error and we have not used it to derive the mean cluster NGC 2362 parameters. NGC 2422 HIP 36736 and HIP 36773 are not used to determine the mean cluster NGC 2422 parameters due to their discrepant proper motions. They are possible NGC 2422 members on the basis of their radial velocities, photometry and proper NGC 2422 motions in the TRC Catalogue. NGC 2437 The proper motion of HIP 37480 is not well determined by Hipparcos. NGC 2437 The star seems to be a non-member on the basis of its proper motion in NGC 2437 the TRC Catalogue. NGC 2451A There is growing evidence for the presence of two star clusters in the NGC 2451A field of NGC 2451, see Roeser & Bastian (1994A&A...285..875R), Platais NGC 2451A et al. (1996BAAS...28V.822P) and Baumgardt (1998A&A...340..402B). The NGC 2451A members and possible members of NGC 2451A are taken from Baumgardt NGC 2451A (1998A&A...340..402B). HIP 37450 and HIP 37838 have somewhat NGC 2451A discrepant proper motions. Their parallaxes are however close to the NGC 2451A cluster mean. Furthermore the large proper motion of NGC 2451A clearly NGC 2451A separates the members from the field stars. The two stars are NGC 2451A therefore considered to be members. NGC 2467 This is not a true star cluster, see Loden (1965ApJ...141..668L, NGC 2467 1966ArA.....4...65L) and Feinstein & Vazquez (1989A&AS...77..321F). NGC 2483 This is not a true star cluster, see Fitzgerald & Moffat NGC 2483 (1975A&AS...20..289F) and Havlen (1976A&A....50..227H). NGC 2527 HIP 39574 and 39602 are non-members according to Lindoff NGC 2527 (1973A&AS....9..229L). Their proper motions are nevertheless NGC 2527 compatible with cluster membership. NGC 2579 Lindoff (1968ArA.....5...63L) found 9 possible members but had some NGC 2579 doubt concerning the reality of the cluster. We could find 3 possible NGC 2579 members in the TRC Catalogue. Their proper motions agree with each NGC 2579 other, adding some evidence for the reality of the cluster. HIP 41024 NGC 2579 is a possible member according to Lindoff (1968ArA.....5...63L), and NGC 2579 furthermore its proper motion is in agreement with the two other TRC NGC 2579 stars. It may therefore be a member. NGC 2669 HIP 43083 is not used to determine the cluster motion. The star is a NGC 2669 probable member based on its photometry and its proper motion in the NGC 2669 TRC Catalogue. The Hipparcos proper motion however differs NGC 2669 significantly from the mean of other members in the TRC Catalogue. The NGC 2669 star may be a binary. NGC 3114 HIP 49245 has a radial velocity in good agreement with that of other NGC 3114 cluster members in the radial velocity study of Amieux & Burnage NGC 3114 (1981A&AS...44..101A). Furthermore its photometry is in good agreement NGC 3114 with the assumption of a cluster membership. We therefore regard it as NGC 3114 a cluster member. NGC 3324 The membership of HIP 52004 in this cluster is unclear. It is a NGC 3324 foreground star according to Claria (1977A&AS...27..145C), but Forte NGC 3324 (1976A&AS...25..271F) considers it to be a member on the basis of its NGC 3324 radial velocity and due to an HII shell which surrounds the star and NGC 3324 is also connected with the cluster. NGC 3496 This is probably not a true star cluster, see Sher NGC 3496 (1965MNRAS.129..237S) and Balona & Laney (1995MNRAS.277..250B). NGC 3496 Even if there is a cluster in this field, HIP 53743 is probably not a NGC 3496 member (Sher, 1965MNRAS.129..237S). NGC 3572 The membership of HIP 54606 is uncertain. Schmidt-Kaler NGC 3572 (1961ZA.....53....1S) considers the star to be a cluster member, NGC 3572 while Moffat & Vogt (1975A&AS...20..125M) do not. NGC 4337 The photometry of Moffat & Vogt (1973A&AS...10..135M) casts doubts on NGC 4337 the reality of this cluster. NGC 4755 HIP 62931 has a 54% membership probability in the proper motion study NGC 4755 of King (1981, Syd. Obs. Papers 89). In addition its radial velocity, NGC 4755 photometry and central position in the cluster strongly support its NGC 4755 membership. We therefore regard it as a cluster member. NGC 5823 The membership of both stars is uncertain since they are not well NGC 5823 observed. Their photometry is compatible with cluster membership. NGC 6169 This is not an open cluster, see Moffat & Vogt (1973A&AS...10..135M). NGC 6618 M17. The membership of HIP 89804 is somewhat uncertain. It is a member NGC 6618 according to Hobbs (1961AJ.....66..517H). NGC 6755 The membership of both stars is somewhat uncertain since the cluster NGC 6755 is not well observed. Svolopoulos (1961ApJ...134..612S) considers NGC 6755 HIP 93932 to be a member on the basis of its spectral type and NGC 6755 photometry. NGC 6834 There is no consensus in the literature concerning the membership of NGC 6834 HIP 97764 and HIP 97806. Our classification follows the results of NGC 6834 Turner (1976AJ.....81.1125T). NGC 6866 The proper motions of both stars deviate considerably from each other. NGC 6866 However, the possible members in the TRC Catalogue show a clustering NGC 6866 near ({mu}_{alpha}_*/{mu}_{delta}_)=(-2/-5)mas/yr and the proper NGC 6866 motions of both stars are compatible with this value. We therefore NGC 6866 consider them to be cluster members. NGC 6883 The membership of HIP 99437 is very uncertain because the cluster is NGC 6883 not well observed. NGC 7092 The proper motion difference between HIP 106346 and the other cluster NGC 7092 stars is too large to be explained by a statistical fluctuation. NGC 7092 HIP 106346 was therefore not used to determine the mean cluster NGC 7092 motion. NGC 7686 This is probably not a real star cluster, see Johnson NGC 7686 (1961LowOB...5..133J) and Becker (1963ZA.....57..117B). ONC The Orion Nebula Cluster. The following three stars were not used to ONC determine the mean cluster motion: HIP 26237, 26258 and 26442. They ONC have proper motions close to the cluster mean in the proper motion ONC study of McNamara et al. (1989AJ.....97.1427M), but their Hipparcos ONC proper motions differ significantly. The most likely explanation is ONC that the Hipparcos proper motion is influenced by binary effects. The ONC proper motions of HIP 26000 and HIP 26199 are very close to the ONC cluster mean in the study of McNamara et al. (1989AJ.....97.1427M). ONC They are therefore considered to be members. Ros 5 It is unclear whether this is a true star cluster, see Lee & Perry Ros 5 (1971AJ.....76..464L) and Baumgardt (1998A&A...340..402B). The Ros 5 possible members are taken from Baumgardt (1998A&A...340..402B). Rup 98 On the basis of their proper motions HIP 58411 and HIP 58432 exclude Rup 98 each other as members. The mean proper motion of the members in the Rup 98 TRC Catalogue strongly supports the membership of HIP 58432. We Rup 98 therefore consider HIP 58411 to be a field star. Tru 18 Concerning the membership of GH Car (HIP 54621) see the discussion Tru 18 in the text. Tru 24 The existence of this cluster is doubtful, see the discussion in Tru 24 Perry et al. (1991A&AS...90..195P). Tru 33 Two cluster members in the TRC Catalogue have proper motions close to Tru 33 ({mu}_{alpha}_*/{mu}_{delta}_) = (-10.5/-2.5)mas/yr. Therefore, on the Tru 33 basis of its proper motion, HIP 90230 cannot be a cluster member. UPG 1 This is not a star cluster, see Baumgardt (1998A&A...340..402B).