Minor Planet 190208 (2006 AQ) & Dwarf Planet 1 Ceres

An image of minor planet 190208 (2006 AQ) taken on 2018 February 2 just after midnight. Celestron C11 + SBIG STF-8300M (2 x 2 binning). Stack of 3 integrations each 2 minutes long and aligned on the asteroid (hence elongated stars). FOV: 22 x 16 arcminutes.

Data from JPL Horizons:
RA: 09 35 17.42 (measured with AstroArt: 09 35 17.46)
Dec: +13 13 53.1 (measured with AstroArt: +13 13 53.4)
Magnitude: 17.9
Distance: 0.46 AU
Constellation: Leo

For comparison, two stacked images of Ceres taken with the same equipment as above (same FOV). 2 hours 7 minutes between images.

 

3200 Phaethon

Phaethon is the parent body of the Geminid meteors. This image was obtained shortly after midnight on 2017 December 12. It is a composite of 60 x 20 second images through a Celestron c11. The FOV is 22 x 16 arcminutes. North up, Phaethon was moving east to west (left-to-right).

 

Triton Occultation of UCAC4 410-143659 on 2017 October 5

Observer
Longitude: 000° 19′ 57” West; Latitude: 50° 53′ 16” North; Altitude: 20m (WGS-84)

Equipment
Celestron C11 f/10 focal length:2800mm diameter: 280mm
SBIG STF-8300M binned 2 x 2, subframe 1429 x 655 (binned) pixels
Filter: Luminance (Astronomik)

Imaging
Integration time: 2 secs
Dead time: approx. 2 secs for download & file save

Processing
AIP4WIN
Bias & dark-frame subtraction, no flat-field applied
Photometry measurements using ‘Multi-Image Photometry’ tool
Radii chosen to minimise contamination from Neptune

Results
Ingress ½ light estimated at 23:47:17 ±4 seconds
Egress ½ light estimated at 23:49:41 ±4 seconds

The published paper analysing the results published in Astronomy & Astrophysics can be found here: Constraints on the structure and seasonal variations of Triton’s atmosphere from the 5 October 2017 stellar occultation and previous observations