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 - 2026 		#notes
1 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
2 HD 105805 Em* 12 10 46.0951571112 +27 16 53.421950208   6.110 5.987     A5V 100 0
3 HD 105863 * 12 11 07.3820881128 +25 59 24.629771616   10.18 9.55     F8.2 47 0
4 Cl Melotte 111 OpC 12 11 54.9 +25 16 36           ~ 520 0
5 V* GM Com dS* 12 12 24.8945127048 +27 22 48.353939724   8.44 8.1     F2-3V 129 0
6 HD 106691 Em* 12 16 08.3755905912 +25 45 37.337623776   8.46 8.08     F3 113 0
7 HD 106946 Em* 12 17 50.9063952576 +25 34 16.838682780   8.19 7.87     F2Vs 110 0
8 HD 107067 SB* 12 18 36.1809470880 +23 07 12.274326840   9.17 8.70     F8 95 0
9 HD 107132 V* 12 19 01.4794667088 +24 50 46.186912968   9.26 8.81     F7Vv 85 0
10 V* FM Com dS* 12 19 02.0250151224 +26 00 30.060577116   6.605 6.433     A6:IV-Vmv 165 0
11 * 8 Com * 12 19 19.1929880208 +23 02 04.821806040   6.416 6.220     kA7hF2mF3 147 0
12 * 10 Com Em* 12 19 50.6242729536 +28 27 51.675976548   6.812 6.617     kA5mA7(V) 129 0
13 HD 107399 Em* 12 20 45.5706181896 +25 45 57.104302932   9.62 9.00     G0 123 0
14 V* KU Com dS* 12 21 26.7390932544 +24 59 49.298164296   7.64 7.38     Am 130 0
15 HD 107583 Em* 12 21 49.0266762216 +26 32 56.750515116   9.89 9.31     G0V 109 0
16 HD 107611 Em* 12 21 56.1616739640 +27 18 34.236329472   8.95 8.50     F5 124 0
17 HD 107685 * 12 22 24.7563796200 +22 27 50.908932288   8.98 8.54     F6 98 0
18 * 12 Com SB* 12 22 30.3113907816 +25 50 46.167660348 5.56 5.30 4.81 4.34 4.01 F6III+A3V 196 0
19 HD 107793 SB* 12 23 08.3994739320 +25 51 04.947925896   9.64 9.09     F9V 123 0
20 HD 107877 Em* 12 23 41.0100897456 +26 58 47.754411960   8.75 8.35     F5 115 0
21 HD 107935 SB* 12 24 03.4621039848 +25 51 04.359102696   6.917 6.693     Am 94 0
22 V* IL Com RS* 12 25 02.2563809088 +25 33 38.383306020   8.63 8.14     F8 161 0
23 HD 108154 * 12 25 22.4975294904 +23 13 44.725774908   8.99 8.56     F5 100 0
24 HD 108226 Em* 12 25 51.9521131776 +26 46 36.015060288   8.76 8.34     F5 113 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 167 0
26 * 16 Com * 12 26 59.2962947904 +26 49 32.526134544   5.045 4.959   4.93 A4V 169 0
27 HD 108486 EB* 12 27 38.3636590224 +25 54 43.580490048   6.835 6.654     A1IV-VSrSi 138 0
28 * 21 Com a2* 12 31 00.5605002264 +24 34 01.797245328   5.496 5.436     A2pv 295 0
29 HD 108976 Em* 12 31 03.0979192032 +27 43 49.221073380   9.03 8.57     F6V 116 0
30 HD 109069 * 12 31 50.5548514464 +29 18 50.908640220   7.86 7.55     F0V 62 0
31 * 22 Com * 12 33 34.2193153104 +24 16 58.739975472   6.363 6.243     A4Vm 164 0
32 HD 109483 Em* 12 34 54.2985164088 +27 27 20.207769624   9.60 9.0     G4.8 38 0
33 HD 151932 WR* 16 52 19.2477039480 -41 51 16.270066224 6.06 6.79 6.51 7.64   WN7h 326 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 205 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+ 390 0
36 HD 152248 Y*O 16 54 10.0618206816 -41 49 30.139291596 5.56 6.15 6.088     O7Iabf+O7Ib(f) 270 0
37 NGC 6231 OpC 16 54 14.4 -41 48 53           ~ 562 0
38 HD 152270 WR* 16 54 19.6991292072 -41 49 11.531710092 6.26 6.80 6.597 6.72 6.39 WC7+O5-8 315 0
39 HD 152424 s*b 16 55 03.3294878112 -42 05 26.990821824 6.11 6.69 6.27 7.49   OC9.2Ia 210 0

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