Observation by Alex Pratt: Video astrometry of PHA 2005 LW3 - 2022 ...

Uploaded by

Alex Pratt

Observer

Alex Pratt

Observed

2022 Nov 23 - 23:00

Uploaded

2022 Nov 27 - 12:09

Equipment

C11 f/10 and f/3.3 focal reducer
Watec 910 HX video camera
IOTA GPS 1PPS video time and date inserter
OccuRec (recording)
Tangra (reduction)

Exposure

0.64s (16 video frames)

Location

Z92 (Bortle 7)

Target name

PHA NEO 2005 LW3

Title

Video astrometry of PHA 2005 LW3 - 2022 Nov 23

About this image

2005 LW3 is a PHA (Potentially Hazardous Asteroid) in an Apollo-class orbit which brings it close to Earth. During its flyby on the night of 2022 November 23 it was magnitude 13, about 3 lunar distances from Earth and moving with an apparent sky motion of 2 arcsec/second.

That evening my sky wasn't clear, with variable cloud cover and some high thin cloud, and a breeze was occasionally nudging my 'scope. I obtained some astrometry of this NEO, although I had fewer reference stars than I hoped and had to use a longer integration time than planned (0.64s instead of 0.32s).

The plots show the astrometric residuals computed by NEODyS (derived from MPC data). The chi-squared values are an indicator of data quality (values near 0 are better). The 7 black data points are from my video astrometry, the red points are professional observatories and surveys (where I could identify them) and the blue points are all other stations. (One red point had a quality value of 9.55 and isn't included in the plot).

Files associated with this observation

Video astrometry of NEO 2005 LW3 - ARP.png (48.7 kB)

Like this image

Grant Privett, Tim Haymes, David Basey, Philip Jennings

Comments

Tim Haymes, 2022 Nov 27 - 16:30 UTC

Good agreement Alex.

Alex Pratt, 2022 Nov 30 - 21:24 UTC

Thanks Tim. NEODyS have recomputed their results for 2005 LW3, and my residuals are a little smaller, but I won't spend time updating my plots.

Cheers,

Alex.

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