Cassiopeia Observatory logo

iPhone Comets Lemmon & SWAN

Posted: 25 October 2025

Open: Friday, 24 October 2025, 1806 MST
Temperature: 79°F
Session: 2102
Conditions: Clear

Equipment:
12" f/8 LX600 w/StarLock
2" 24mm UWA eyepiece
2" 30mm eyepiece
2" 50mm eyepiece

Camera:
iPhone 15 Pro Max

1813 MST: LX600 ON, StarLock OFF, High Precision OFF.

Viewed the Moon, 102X and 81X.

Attached the LiDAR Cover on the iPhone 15 Pro Max and mounted the iPhone on the 30mm eyepiece using the 3-axis adapter.

1828 MST: Wi-Fi ON.

Used SkySafari 7 Pro on the iPhone to GOTO to Comet C/2025 A6 (Lemmon).

1838 MST: StarLock ON.

1844 MST: Took this StarLock autoguided iPhone afocal 81X image of Comet Lemmon using the NightCap Camera app (Long Exposure, Light Boost, ISO 10000, 1sec, 1 minute, 1X lens).

photo

Used SkySafari 7 Pro to GOTO Comet C/2025 R2 (SWAN). Took this StarLock autoguided iPhone afocal 81X image of Comet SWAN using NightCap Camera (Long Exposure, Light Boost, ISO 10000, 1sec, 1 minute, 1X lens).

photo

Viewed Comet SWAN, 81X. Nice coma, but no tail visible.

Viewed Comet Lemmon, 81X. Nice coma. Long tail visible across entire eyepiece field-of-view.

1900 MST: Comet Lemmon was now faintly visible naked eye. The comet was nice in 12x50 binoculars, with a 4° long tail visible.

Viewed M31 (Andromeda Galaxy), 81X and 49X. Tried some iPhone imaging but could not get a good image.

1925 MST: StarLock OFF, Wi-Fi OFF.

Viewed M33 (Triangulum Galaxy), 49X, 81X, and 102X.

1937 MST: LX600 OFF.

1947 MST: Took a Sky Quality reading.

Close: Friday, 24 October 2025, 1949 MST
Temperature: 64°F
Session Length: 1h 43m
Conditions: Clear, SQM 20.72


Comments are welcome using Email. Please read the Email Etiquette guidance.


Previous report

Cassiopeia Observatory Home Page

Back to Top


Copyright ©2025 Michael L. Weasner / mweasner@mac.com.
URL = http://www.weasner.com/co/Reports/2025/10/25/index.html