Nearly Full Moon, Pup Star iPhone test;
Posted: 10 February 2017
Sunday, 5 February 2017, began with a mostly clear sky, but it was overcast by early afternoon. Cloudy nights continued until Thursday, 9 February. The forecast was for a cloudy night but the sky began clearing after sunset.
Open: Thursday, 9 February 2017, 2002 MST
Conditions: Mostly clear
2007 MST: LX600 ON, StarLock OFF. High Precision OFF.
Viewed the Moon, 102X, less than a day before precisely Full. A slight terminator was visible. The Moon was very bright.
2021 MST: I wanted to try a test this night. Could I photograph the "Pup Star" (Sirius B) using the iPhone and NightCap Pro? First, I slewed the 12" telescope to the star Rigel and switched to a 2" 9mm 100° eyepiece (271X). Focused on the star using the Astrozap Bahtinov Mask. Rigel's companion star was easily seen. It is at a similar distance to that between Sirius A and Sirius B and so would be a good guide for the "Pup Star". Mounted the iPhone using the Levenhuk adapter and did a 15 second video recording using NightCap Pro (ISO 400, 1/60sec). I then slewed to Sirius, tweaked the focus using the Mask, and did a 15 second video recording using the same exposure settings. Here are single frames from the two videos, cropped:
Rigel's companion is visible (below the main star), but the "Pup Star" (which would be to the right of Sirius A) was not captured. Will try again on a future session using a higher magnification to increase the separation of Sirius B from Sirius A.
2039 MST: ended the iPhone imaging tests. I then tried observing the "Pup Star", 271X, but without success. I had seen it with the 8" LX200-ACF telescope but have yet to observe it with the 12" telescope.
2047 MST: slewed the telescope to the star Canopus, which was very low in the southern sky. Canopus is the third brightest star in the sky after the Sun and Sirius. I used the D7200 DSLR for this photograph of Canopus just above the mountain to the south and the moonlit observatory, f/11, 10 seconds, ISO 1600:
Mouseover or tap on image for a pointer to Canopus
2104 MST: LX600 OFF.
Close: Thursday, 9 February 2017, 2110 MST
Session Length: 1h 08m|
Conditions: Mostly clear
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