Observation Notes:
This was my fourth and final observation and sketch during my recent night at Anderson Mesa. I picked it from my Bright Star Atlas since it was a convenient find next to the tail of Delphinus. Sky Atlas 2000.0 provided the star hopping route. At low power (37.5X), it stood out as a brighter star that really liked averted vision. At 240X, it took on a double-shelled appearance with a brighter, but non-stellar peak at the core. It exhibited a pale, aqua-gray color. I didn’t end up using the UHC filter on it, since dawn was making its presence known, and I was feeling pretty wiped out.
Object Information:
Discovered by Ralph Copeland in 1884. NGC 6891 is also cataloged as: PK54-12.1.
Subject | NGC 6891 |
Classification* | Planetary Nebula (2a(2b)) |
Position* | Delphinus [RA: 20:15:08.85 / Dec: +12:42:15.2] |
Size* | 74″ x 62″ |
Brightness* | 10.5 vMag |
Date/Time | July 3, 2008 – 4:00 AM MST (July 3, 2008 – 11:00 UT) |
Observing Loc. | Anderson Mesa, Arizona, USA |
Instrument | Orion SkyQuest XT8 (203 mm dia./1200 mm F/L) |
Eyepieces/Mag. | 10 mm Sirius Plössl + 2X Barlow (240X) + UltraBlock |
Conditions | Partly Cloudy, calm |
Seeing | 6/10 Pickering |
Transparency | ~ Mag 6.0 NELM |
*References | NGCIC.org |