Talk:Geminga
Latest comment: 3 years ago by Rod57 in topic Where does apparent magnitude come from
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Identification with a visual source for parallax and distance - any update from Gaia
edit- The proper motion and distance was derived ~2007 from the visual? images taken with the WFC of ACS on HST (of the "faint blue object" found by the Einstein observatory? ). (Was no parallax reported from Hipparcos for it ? - too faint)
- What magnitude is the visual component (since it and colour affects Gaia accuracy) ?
- Has Gaia since 2013 provided a more accurate parallax (and distance) for Geminga ? - Rod57 (talk) 11:20, 4 November 2021 (UTC)
- As far as I can see from Gaia archive search, Geminga (in EDR3) has a position, and magnitude (20.620018) and bp_rp ? magnitude (0.8857765) but no parallax or radial velocity. Presumably it's too faint for Gaia. ... Gaia goals were parallax precision "200 μas at 20 mag", so Geminga could be at the limit. - Rod57 (talk) 14:34, 4 November 2021 (UTC)
Where does apparent magnitude come from
editInfobox says apparent magnitude 25.5 and refs SIMBAD. I can't see it there. Is it in SIMBAD ? (Gaia EDR3 seems to say mag 20.6) And the Age ? - Rod57 (talk) 14:43, 4 November 2021 (UTC)