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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. 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:
  2. 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.
  3. 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!
  4. Farewell 2014 JO25. +1 mag fainter. Low declination.
  5. 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.
  6. It is likely to be the brightest object that we deal with this year. The majority of our work is fainter than 18th magnitude.
  7. 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:
  8. Magnitude measured +11.4 last night. We have also produced the only lightcurve currently available.
  9. We were unable to observe it last night due to bad weather. Your visual estimate would only be slightly brighter than than current photometry suggests.
  10. We have observed it and submitted our data. It is currently mag +11.5
  11. The pleasure is mine. I enjoy other people being interested in asteroids.
  12. Press F2 for the configuration window. Plugins Solar System Editor Solar System Import Orbital Elements Online Search Type 2014 JO25 Tick the found asteroid. Add Object and restart the application.
  13. 2014 JO25 is a potentially hazardous asteroid with a diameter of 1.3 km. It will make a very close approach to Earth in a few hours, when it safely passes at 4.6 times the distance between Earth and the Moon – the closest any asteroid of that size will get in more than a decade. At the time of imaging the asteroid was moving at 129"/min and was nearly half a magnitude fainter than the ephemeris predicted. Goldstone has determined that the asteroid is elongated, so a fainter magnitude is to be expected 2014 JO25c.avi