Talk:(469372) 2001 QF298

Assuming a density of 2.0

Just as I did in 2008/2009, I still have neutral/mixed feeling about assuming a density of 2.0. -- Kheider (talk) 19:38, 21 May 2012 (UTC)

Assumed dwarf planet

Burton shows that with an absolute magnitude (H) of 4.7 and an assumed albedo of 0.1, you would get a dwarf-planet candidate of about 482km in diameter. Once an object drops below absolute magnitude 4.9 it would be assumed to be smaller than the generic 450km cutoff. The MPC discovery reference, JPL, and Buie all show the original absolute magnitude of 4.7. The Minor Planet Center currently shows an absolute magnitude of 5.1. -- Kheider (talk) 17:21, 22 May 2012 (UTC)

There are two problems here. The first is that MPC magnitudes (and JPL's ones that are likely based on them) are generally not reliable. For instance, they do not report their photometric errors. (See Mommert 2012 et al for details). The second problem is frequent confusion between R-band and V-band magnitudes. When an object is reported to MPC, it is its R-band magnitude that is often reported. This explains why MPC now thinks that QF298 is 5.1—this is 0.4 (V-R color) more than 4.7. By the way Doressoundiram 2007 reports the V-band absolute magnitude as 5.34 ± 0.11, which is consistent within errors with 5.43 ± 0.07 from Mommert 2012. So, I prefer to use magnitude only from the photometric literature where available. Ruslik_Zero 18:47, 22 May 2012 (UTC)

From Tegler the magnitude is 5.33 ± 0.05, which is also consistent. Ruslik_Zero 18:53, 22 May 2012 (UTC)

MPC absolute magnitudes are more reliable than JPL's when someone is not citing an in-depth study. -- Kheider (talk) 20:37, 22 May 2012 (UTC)

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