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NEO Asteroid (7335) 1989 JA

Posted: 27 May 2022

Open: Thursday, 26 May 2022, 1915 MST
Temperature: 87°F
Session: 1772
Conditions: Clear, breezy

12" f/8 LX600 w/StarLock
2" 24mm UWA eyepiece
Focal Reducer
2" UHC filter


SYNCed observatory clock and D850 DSLR clock to WWV time signals.

1925 MST: Sunset.

1927-2000 MST: Relaxed on the observatory patio bench.

2001 MST: LX600 ON, StarLock OFF, High Precision OFF.

Slewed to Spica. Then prepared the D850 DSLR for imaging.

2007-2040 MST: Relaxed some more on the bench.

Mounted the D850 DSLR at prime focus + focal reducer, focused on the star Spica, REMOVED THE MASK (!), and locked the telescope mirror.

2046 MST: Wi-Fi ON.

Used SkySafari 7 Pro on the iPhone to GOTO Near Earth Object (NEO) Asteroid (7335) 1989 JA. The asteroid was very low in the southern sky.

2049 MST: StarLock ON.

Began imaging the asteroid. It was moving so fast that I had to keep slewing the telescope to get good framing in the camera field-of-view. I was able to get three good images of Asteroid (7335) 1989 JA, StarLock autoguided, 1 minute, ISO 800, White Balance 4550K, 2 minute intervals.


The image of the asteroid looks wobbly, but that is a result of its low altitude in the sky and atmospheric distortion.

2114 MST: Wi-Fi OFF.

Mounted the D850 DSLR at prime focus + UHC filter, focused on Spica, locked the mirror. Slewed to Centaurus A (galaxy). I began imaging the galaxy, but seeing rapidly deteriorated, resulting in poor autoguiding. I finally gave up. This is the only useable image I got (5 minutes, ISO 6400).


2130 MST: StarLock OFF.

Viewed Centaurus A (galaxy), 102X. The view was not very good this night.

2138 MST: LX600 OFF.

2145 MST: Took a Sky Quality reading and reported the result to Globe at Night.

Close: Thursday, 26 May 2022, 2149 MST
Temperature: 74°F
Session Length: 2h 34m
Conditions: Clear, SQM 21.06

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