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Guy Wells

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About Guy Wells

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    Proto Star
  • Birthday 06/11/76

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    Asteroid Astrometry
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  1. Hi Steve. I rarely look on SGL. So, would not be able to contribute that much. Astrometry is very, very time consuming unfortunately.
  2. Hi Steve. Everything you need to know is here:
  4. 6063 Jason is an Apollo-type asteroid with a diameter of 1.4 km. It will came relatively close to Earth on May 27, when it is reached mag. +13.6. Jason can be seen here moving at 19 "/min over a period of 20 minutes.
  5. When we plan the observatories schedule we use a variety of sources to determine what asteroids need data to reduce their orbital uncertainties. The asteroid in that link is at very low declination so impossible from our location.
  6. 2017 CS is not a possible impactor. It is a PHA because its Minimum Orbit Intersection Distance (MOID) with the Earth is less than 0.05 au 2017 CS is curently at closest approach. 0.02 AU (2991957km)
  7. 2017 CS is an Apollo-type potentially hazardous asteroid with a diameter of 360-800 metres, seen here moving at 24 "/min over a 25 minute period. This asteroid is currently very bright at 13th magnitude.
  8. 134340 Pluto is a dwarf planet that resides within the Kuiper belt, currently a little over 32 AU (4.9 billion km) from the Earth. Pluto was discovered in 1930 by Clyde Tombaugh, but actually appeared in images some 21 years earlier. Over 100 years ago the power of imaging was apparent. In 2015, NASA's New Horizons spacecraft visited Pluto and its largest Moon Charon, revolutionizing our understanding of this distant world. Pluto, mag +14.7, is currently located in the constellation of Sagittarius. It was at an altitude of 15 degrees. Pluto and Charon, imaged by New Horizons:…/thumbnails/image/nh-pluto-charon-v2-… Further information:
  9. Supernova 2017eaw in NGC 6946 (the Fireworks Galaxy) Photometry (V unfiltered, URAT-1 star catalog): 12.89 +/- 0.02 mag 2017eaw is a type IIP supernova. It seems to have reached maximum brightness about 1-2 days ago, at V=12.8 mag. It is expected to fade by 0.3-0.5 mag over the next week, and then reach a plateau with constant brightness for several months.
  10. Half a magnitude fainter last night. That is the last time that we shall observe this PHA. The next 'close' pass is 12-04-2020, at 0.16AU. It won't be observable from our location again, at least while I am still here!
  11. Farewell 2014 JO25. +1 mag fainter. Low declination.
  12. Potentially Hazardous Asteroid 2014 JO25 We follow this remarkable Near Earth asteroid as it is moving away from Earth and fading. It will soon be too far south to be seen from Z48 and Z80, but last night it was still visible and as bright as +13.4 mag.
  13. It is likely to be the brightest object that we deal with this year. The majority of our work is fainter than 18th magnitude.
  14. Potentially Hazardous Asteroid 2014 JO25 We observed this large Near Earth asteroid again last night, when it was very bright at +11.6 mag. It was crossing our field of view in about 20 minutes, so we imaged it moving through three different star fields in less than an hour! The lightcurve that we obtained from our images covers about one fifth of a full rotation. 2014 JO25's lightcurve shows the typical features of an elongated object, as it brightens and fades over the course of a rotation. The shape and rotation period were first seen in radar images taken at Arecibo observatory a few days ago. Our lightcurve of 2014 JO25 is currently the only one in the database. The lightcurve database: