2003AJ....126.2408M

Query : 2003AJ....126.2408M

2003AJ....126.2408M - Astron. J., 126, 2408-2410 (2003/November-0)

Improved Hipparcos parallaxes of Coma Berenices and NGC 6231.

MAKAROV V.V.

Abstract (from CDS):

A method to reprocess the Hipparcos Intermediate Astrometry Data that reduces the propagation of the along-scan spacecraft attitude errors was developed and successfully used to obtain a more consistent parallax of the Pleiades (Makarov, published in 2002). The same technique is used now to correct the Hipparcos parallaxes of the Coma Berenices and NGC 6231 open clusters, which are also in error. The new mean parallax of Coma is 12.40±0.17 mas (against previously 11.43 mas) and of NGC 6231 1.7±0.4 mas (against previously -0.8 mas). The new data for Coma are in excellent agreement with the pre-Hipparcos main-sequence fitting estimates. All six members of NGC 6231 that have negative parallaxes in Hipparcos obtain positive parallaxes. These results suggest that the main source of astrometric error has been correctly identified, and that a more accurate Hipparcos catalog can be computed.

Abstract Copyright: ∼

Journal keyword(s): Astrometry - Galaxy: Open Clusters and Associations: Individual: Name: Coma - Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 6231 - Stars: Distances

Simbad objects: 39

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Number of rows : 39
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3435 0
2 HD 105805 V* 12 10 46.0951571112 +27 16 53.421950208   6.110 5.987     A4Vn 92 0
3 HD 105863 * 12 11 07.3820881128 +25 59 24.629771616   10.18 9.55     F8.2 38 0
4 V* GM Com dS* 12 12 24.8945127048 +27 22 48.353939724   8.44 8.1     F2-3V 117 0
5 HD 106691 * 12 16 08.3755905912 +25 45 37.337623776   8.46 8.08     F5IV 101 0
6 HD 106946 * 12 17 50.9063952576 +25 34 16.838682780   8.19 7.87     F2Vs 100 0
7 HD 107067 SB* 12 18 36.1809470880 +23 07 12.274326840   9.17 8.70     F8 91 0
8 HD 107132 V* 12 19 01.4794667088 +24 50 46.186912968   9.26 8.81     F7Vv 82 0
9 V* FM Com dS* 12 19 02.0250151224 +26 00 30.060577116   6.605 6.433     A6:IV-Vmv 157 0
10 * 8 Com * 12 19 19.1929880208 +23 02 04.821806040   6.416 6.220     A8m 138 0
11 * 10 Com * 12 19 50.6242729536 +28 27 51.675976548   6.812 6.617     Am 119 0
12 HD 107399 * 12 20 45.5706181896 +25 45 57.104302932   9.62 9.00     F8V 108 0
13 V* KU Com dS* 12 21 26.7390932544 +24 59 49.298164296   7.64 7.38     Am 118 0
14 HD 107583 * 12 21 49.0266762216 +26 32 56.750515116   9.89 9.31     G0V 96 0
15 HD 107611 * 12 21 56.1616739640 +27 18 34.236329472   8.95 8.50     F6V 110 0
16 HD 107685 * 12 22 24.7563796200 +22 27 50.908932288   8.98 8.54     F6 88 0
17 * 12 Com SB* 12 22 30.3113907816 +25 50 46.167660348 5.56 5.30 4.81 4.34 4.01 F6III+A3V 188 0
18 HD 107793 SB* 12 23 08.3994739320 +25 51 04.947925896   9.64 9.09     F9V 111 0
19 HD 107877 V* 12 23 41.0100897456 +26 58 47.754411960   8.75 8.35     F6 101 0
20 Cl Melotte 111 OpC 12 24 03.4 +25 39 07           ~ 480 0
21 HD 107935 SB* 12 24 03.4621039848 +25 51 04.359102696   6.917 6.693     Am 88 0
22 V* IL Com RS* 12 25 02.2563809088 +25 33 38.383306020   8.63 8.14     F8 151 0
23 HD 108154 * 12 25 22.4975294904 +23 13 44.725774908   8.99 8.56     F5 90 0
24 HD 108226 V* 12 25 51.9521131776 +26 46 36.015060288   8.76 8.34     F5 101 0
25 * 14 Com * 12 26 24.0644226936 +27 16 05.659806648 5.40 5.22 4.95 4.70 4.55 F1IV:npS_sh 161 0
26 * 16 Com * 12 26 59.2962947904 +26 49 32.526134544   5.045 4.959   4.93 A4V 160 0
27 HD 108486 EB* 12 27 38.3636590224 +25 54 43.580490048   6.835 6.654     A1IV-VSrSi 127 0
28 * 21 Com a2* 12 31 00.5605002264 +24 34 01.797245328   5.496 5.436     A2pv 283 0
29 HD 108976 * 12 31 03.0979192032 +27 43 49.221073380   9.03 8.57     F6V 104 0
30 HD 109069 * 12 31 50.5548514464 +29 18 50.908640220   7.86 7.55     F0V 59 0
31 * 22 Com * 12 33 34.2193153104 +24 16 58.739975472   6.363 6.243     A4Vm 155 0
32 HD 109483 * 12 34 54.2985164088 +27 27 20.207769624   9.60 9.0     G4.8 31 0
33 HD 151932 WR* 16 52 19.2477039480 -41 51 16.270066224 6.06 6.79 6.51 7.64   WN7h 313 0
34 HD 152235 s*b 16 53 58.8528412848 -41 59 39.577848180 6.47 6.92 6.38 5.84 5.42 B0.5Ia 192 0
35 * zet01 Sco s*b 16 53 59.7271314888 -42 21 43.307334468 4.80 5.31 4.79 4.32 3.86 B1.5Ia+ 372 0
36 HD 152248 Y*O 16 54 10.0618206816 -41 49 30.139291596 5.56 6.15 6.088     O7Iabf+O7Ib(f) 260 0
37 NGC 6231 OpC 16 54 10.8 -41 48 43           ~ 538 0
38 HD 152270 WR* 16 54 19.6991292072 -41 49 11.531710092 6.26 6.80 6.597 6.72 6.39 WC7+O5-8 303 0
39 HD 152424 s*b 16 55 03.3294878112 -42 05 26.990821824 6.11 6.69 6.27 7.49   OC9.2Ia 199 0

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