MichelangeloPantaleoni on 11-Mar-2024 12:45:32 GMT about HD 305632
The solution to the problem:
Remove "ALS 1962" from the list of identifiers of
HD 305632
and include "ALS 1962" as an identifier for
TYC 8957-3737-1
.
The explanation:
The mistake comes from the ALS catalogue. This mistake was inherited by Simbad and also by the
ALS II
, but it will be corrected soon for the ALS III).
There are two relevant stars here: the brighter star to the north, Gaia DR3 5242168701929139712 (https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ65eef54a267c88&-out.add=.&-source=I/355/gaiadr3&-c=162.59871699016%20-60.80207900141,eq=ICRS,rs=2&-out.orig=o) (G = 7.97 mag) (let's call it G12), and the dimmer one to the south, Gaia DR3 5242168667569358592 (https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ65eef571269444&-out.add=.&-source=I/355/gaiadr3&-c=162.60666279802%20-60.82456419748,eq=ICRS,rs=2&-out.orig=o) (G = 11.75 mag) (let's call it G92). These stars are separated by 1.36'.
According to the original ALS catalogue, ALS 1962 (https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-out.add=.&-source=5125/%2a&ALS=1962) = LS 1962 (https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ65eef6a02713af&-out.add=.&-source=III/43/main&recno=1962) = HD 305632 (https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ65eef6e5272c31&-out.add=.&-source=III/182/catalog&recno=34187) = CPD -60 2315 (https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ65eef6bb271f6d&-out.add=.&-source=I/108/cpd&recno=380897) = CD -60 3227 (https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ65eef6ba271eb1&-out.add=.&-source=I/114/cd&recno=566945). But this is wrong. The coordinates and the photometry in ALS (V = 11.9 mag) and LS (V = 11.4 mag) are compatible with the star G92 (G = 11.8 mag) while the coordinates in HD, CPD and CD coincide with star G12. Also the photometry seems to be more compatible between CPD (V = 9.7 mag), CD (V = 9.2 mag) and G12 (G = 8.0 mag).
So what happened here? The original ALS mentions 3 references for the photometry of ALS 1962:
1) In
Shobbrook & Lynga 1994
this appears as star SS 1962 (V = 11.8), which is compatible only with the G92 star both in coordinates and in the photometry.
2) In
Drilling 1991
it appears as star LS 1962 (V = 11.88) which again coincide with G92 in the photometry.
3) In
Wramdemark 1976
it is named as star BBII 15 (V = 11.89), which is compatible with G92 once again in the tabulated photometry and coordinates (not to mention their photographic plate number 2 which allows for a visual match with G92).
Not only that, but the LS photographic plates (which are not currently available on-line) show that LS 1962 is indeed star G92.
Therefore, it seems that the original ALS was referring to star G92 = Gaia DR3 5242168667569358592 (in the photometry, coordinates and the LS identifier) and wrongly matched this information with the HD, CPD and CD identifiers, which are in fact for another star (G12 = Gaia DR3 5242168701929139712). This confusion in the ALS has propagated to Simbad, which currently displays a page for
ALS 1962
and a different one for
LS 1962
.
- Michelangelo Pantaleoni | Centro de Astrobiología (CSIC-INTA)
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