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I/239/hd_notes The Hipparcos and Tycho Catalogues (ESA 1997)
Hipparcos notes: Double and multiple systems (2622 rows)
 
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1 32349G  11 1Sirius. Due to the extreme brightness of the object, the formal standard
2 32349G  11 2errors of great-circle abscissae were severely underestimated. The
3 32349G  11 3astrometric standard errors were instead derived from the statistics of
4 32349G  11 4the post-fit residuals, resulting in a unit weight error of exactly 1.
5 32349G  11 5For this reason, no goodness-of-fit statistic is given in Field H30.
6 32349G  11 6Note that the long period of the astrometric orbit (50 years) prevented
7 32349G  11 7adjustment of the orbital parameters, which were thus all adopted from
8 32349G  11 8the literature (see Part O of the Double and Multiple Systems Annex).
9 32349G  11 9The given astrometric standard errors consequently do not include the
10 32349G  1110uncertainties of the adopted orbit used to reduce the observations to
11 32349G  1111the centre of mass of the system.
I/239/hg_notes The Hipparcos and Tycho Catalogues (ESA 1997)
Hipparcos notes: General notes (3898 rows)
 
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1 32349D  11 1Sirius. Due to the extreme brightness of the object, the formal standard
2 32349D  11 2errors of great-circle abscissae were severely underestimated. The
3 32349D  11 3astrometric standard errors were instead derived from the statistics of
4 32349D  11 4the post-fit residuals, resulting in a unit weight error of exactly 1.
5 32349D  11 5For this reason, no goodness-of-fit statistic is given in Field H30.
6 32349D  11 6Note that the long period of the astrometric orbit (50 years) prevented
7 32349D  11 7adjustment of the orbital parameters, which were thus all adopted from
8 32349D  11 8the literature (see Part O of the Double and Multiple Systems Annex).
9 32349D  11 9The given astrometric standard errors consequently do not include the
10 32349D  1110uncertainties of the adopted orbit used to reduce the observations to
11 32349D  1111the centre of mass of the system.
I/239/hp_notes The Hipparcos and Tycho Catalogues (ESA 1997)
Hipparcos notes: Photometric notes (2444 rows)
 
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