Near Earth Asteroid - Minor Planet Photometry

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Near Earth Asteroid

Photometry > 2018
(172034) 2001 WR1

No reference to light curve period

Amor class NEA
Absolute magnitude (H): 17.7

Data taken on 27_28_29Apr
Despite the slight change in the zero point over the nights, amplitude remain at 0.08m
Email correspondence with Warner who found larger amplitude in march. Pravec indicated it was Phase magnitude relationship at large Phase Angle.

The sudden increase from the average amplitude of 0.08m to 0.17m  may be caused by an event captured.
More data will be taken in Mid May

April data

the data on 04 of May as it started its track through the milkyway. I stopped and will resume again when the weather clear in the next few days. It has slowed somewhat but also dimmer at 16th mag.
the period is about 5.1h and the amplitude is 0.08mag.
The 4th May lightcurve show 0.21 mag that I believe is another event captured.
The combined data was recalculated to derive P1 and P2 as shown.

second orbital period of 26h is only very preliminary.
Mars Crosser

Collaboration with Amadeo Aznar to determine the rotation period

Apollo class asteroid

Previous work published: Warner, B.D. (2016) Minor Planet Bull. 43, 311-319
rotation period was found to be  44.2h

Preliminary work found it to be around 20h bimodal period with ampitude of 0.5m


Aten Class NEA, PHA
Absolute mag (H): 16.4 mag

Previous work done by:
Monteiro, F.; Silva, J.S.; Lazzaro, D.; Arcoverde, P.; et al (2017) Minor Planet Bull. 44, 20-22.]
Rotation period was 6.231h that is different to what current measurement found at 12.32h also based on incomplete lightcurve segments.

Absolute mag (H): 13.2
Previous work done by numerous authors but the latest are:

[Warner, B.D. (2015) Minor Planet Bull. 42, 172-183.]

[Crowell, J.L.; Howell, E.S.; Magri, C.; Nolan, M.C.; et al. (2017) Icarus 291, 254-267.]
rotation period was 4.795h, consisitent with current measurements.

Amor class NEA
Absolute magnitude (H) of 13.6m

Previous work done by:
[Warner, Brian D. (2014) Minor Planet Bull. 41, 213-224.]

Rotation period was 4.19h.
This is not consistent with current measurement.
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2015 DP155

NEA asteroid
2017 YE5

Collaboration with Gold stone and Arecibo. Also with other stations.
Radar show the asteroid to be a same size binary asteroid. Only 4 have been discovered.
Rotation period derived to be 23.4 hours.

2018 NB

This Amor NEA
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