1999 HF1

Orbit, abs. magnitude:

Aten, q = 0.44 AU, a = 0.82 AU, i = 26 deg, H = 14.6 +/- 0.5

Lightcurve periods, amplitudes:

Pshort = 2.319 hr and Plong = 14.013 hr, ampl. 0.12 and 0.10 mag, respectively.

Observations:

This NEA has been observed during 1999 Apr. 23.1 - May 18.9; 11 nights from Ondrejov and 3 nights by M. Hicks and D. Rabinowitz from Table Mountain Observatory. The observations revealed a two period lightcurve, the periods are Pshort = (2.31912 +/- 0.00007) h and Plong = (14.013 +/- 0.004) h. Deconvolved lightcurve components are shown in Figs. 1 and 2. This is the seventh asteroid known to show a two-period lightcurve and is another possible binary asteroid with parameters similar to those of 1996 FG3, 1998 PG and (5407) 1992 AX (Pravec et al. 2000).

Note: The scatter of lightcurve points around the best fit curves is 0.023 mag that is somewhat higher than observational errors (0.01-0.02 mag). It indicates that there are present unmodeled effects, like evolution of the components' shapes.


Fig. 1: Short period lightcurve component

1999 HF1 short period component

Fig. 2: Long period lightcurve component

1999 HF1 long period component

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