Double Stars Eta Draconis and STF 2054
Posted: Sun Jul 04, 2021 1:38 pm
Last evening, July 3, 2021, while testing some eyepieces in my 10 inch f/ 5 Dob , I observed double Stars Eta Draconis and STF 2054.
Eta Draconis m 2.8, 8.2, sep 4.4 sec at PA 143 degrees. I observed this equally well with a 6mm TV Delos, 6mm Radian, and 6mm TMB Planetary for 208x. The tiny secondary was easily seen on the SE side of the primary as a tiny pinprick of bluish light next to a yellowish primary. The seeing was decent. This double is notoriously difficult in poorer seeing.
The distance to this pair is given as 92 light years.
In the same wide field of view lies the pair STF 2054, m 6.1, 7.1, sep 0.9 sec at PA 351 degrees. Both looked white, and were barely separated at the 208x magnification given by the 6mm eyepieces.
The distance to this pair is given as 507 ly, so there is no real association with Eta Draconis.
For these relativity high power views, theDob was sitting on a Round Table tracking platform.
Eta Draconis m 2.8, 8.2, sep 4.4 sec at PA 143 degrees. I observed this equally well with a 6mm TV Delos, 6mm Radian, and 6mm TMB Planetary for 208x. The tiny secondary was easily seen on the SE side of the primary as a tiny pinprick of bluish light next to a yellowish primary. The seeing was decent. This double is notoriously difficult in poorer seeing.
The distance to this pair is given as 92 light years.
In the same wide field of view lies the pair STF 2054, m 6.1, 7.1, sep 0.9 sec at PA 351 degrees. Both looked white, and were barely separated at the 208x magnification given by the 6mm eyepieces.
The distance to this pair is given as 507 ly, so there is no real association with Eta Draconis.
For these relativity high power views, the