Table 4
Basic statistics (mean values and rms) on differences in astrometric positions of Apophis between the observation sets DMPC and DPRAIA as defined in Sect. 5.
| Samples | ⟨ (αMPC−αPRAIA)cosδPRAIA ⟩ | σαcosδ | ⟨ δMPC−δPRAIA ⟩ | σ δ |
|
|
||||
| R | + 0.005 ± 0.005 | 0.059 | −0.000 ± 0.006 | 0.079 |
| U | −0.028 ± 0.005 | 0.096 | −0.007 ± 0.005 | 0.098 |
| O | + 0.069 ± 0.016 | 0.205 | + 0.022 ± 0.010 | 0.132 |
Notes. The values are given in arcsec. Observations that have been reduced with different tools, but using the same catalog (UCAC4) are denoted by R. U represents the astrometric results derived using different catalogs of the UCAC series. O denotes the set of observations that were reduced using various software packages and catalogs other than UCAC. See text for details.
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