RE: Observing session 10th Feb

 
From: "owenb1367@PROTECTED owenb1367@PROTECTED [Abingdon Astronomical Society Mailing List]" <aasmail@PROTECTED>
Subject: RE: Observing session 10th Feb
Date: February 14th 2021

That is true. 3242 in Hydra should be round shortly and you will enjoy that one too.

 

Owen

 

From: aasmail@PROTECTED <aasmail@PROTECTED>
Sent: 14 February 2021 19:11
To: Abingdon Astronomical Society Mailing List <aasmail@PROTECTED>
Subject: RE: [aaslist] Observing session 10th Feb

 

 

From: trevorwilliampitt@PROTECTED

Hi Owen,

 

I went up to a 6 mm, 416x, I have a 5mm kicking around somewhere, but rarely use it.  It would be Barlows thereafter, but never tried that combo, things shoot past too quickly to appreciate the view.

 

Not too sure how the Nexus pointing model works, it seems pretty good.   I added 20 stars for the EQASCOM in the observatories pointing model and get good details how the models work in that system, but I used to get better pointing with the handset, sometimes and accidentally walking into the weights is annoying.

The two star alignment on the Nexus can be extended to 3 and there are other pointing routines on the screen, but not gone into the documentation too much at this time.  Local calibration on a bright star seems to do the trick.

 

Good effort on the latest DSO 186.  I did have a chuckle in your editorial about C objects.

 

Trevor

 

From: aasmail@PROTECTED <aasmail@PROTECTED>
Sent: 14 February 2021 18:13
To: Abingdon Astronomical Society Mailing List <aasmail@PROTECTED>
Subject: RE: [aaslist] Observing session 10th Feb

 

 

From: owenb1367@PROTECTED

I would recommend using the highest power you can on 1535 as it shows a huge amount of detail. One of my favourite PN’s. You will find that the DSC’s may not be so accurate low down. I assume that the Nexus takes into account atmospheric refraction at low altitudes but there may be an issue with the pointing model that low.

 

Owen

 

From: aasmail@PROTECTED <aasmail@PROTECTED>
Sent: 14 February 2021 15:56
To: Abingdon Astronomical Society Mailing List <aasmail@PROTECTED>
Subject: [aaslist] Observing session 10th Feb

 

 

From: trevorwilliampitt@PROTECTED

Having seen my fill of clouds over the last “n” months, last Wednesday was a night of sky viewing clear of clouds and the low humidity, 73% enabled a whole evening dedicated to Deep Sky observing and with no Moon and no soaked equipment.

Aim of the evening – full trial of Nexus DSCs on 20 inch reflector with targets from Herschel 400 list.  Rule 1 – no imaging (far too distracting).

I noticed that I commenced the 400  list in March 2014 and with only around 250 completed it was taking far too long given the number of nights we seem have available, so decided to improve things slightly by using DSCs rather than star hopping and I now hope to get the list finished.

 

I wheeled out the Obsession at 5 p.m. to allow it to cool (not that it needs it).  Did a collimation and added all the bits to allow balance (Telrad and finder) and left it to Astro dark at 7 p.m.  As the OAT was only 1 C, light ENE wind  – lots of clothing was required and the petrol hand warmer ready to warm numb fingers.

 

I started off with a two star alignment, Polaris and Rigel and then tested out on Baton Kaitos in Cetus.  A bit at the edge of 34mm fov x73 times, but set as a calibration point for the area.  I started off with four  galaxies in Cetus NGC 1022, 1052, 936 and 1055.  The Cetus Galaxies were always difficult from South Stoke given Reading and Newbury light pollution and given an alt at 26 deg and az 210 deg they  lay towards  Selsey / Portsmouth from my location so not a lot clearer. The first was really only a faint smudge with only a hint of a spiral arm,  the same could  be said for the NGC 1052, a stella nucleus, NGC936 some elongation with a bar and  NGC1055,  a nice streak of light with some mottling and benefitting from being higher at 30 deg alt.  Sadly NGC 908 and 720 were too low so will have to wait for another year.

 

Moving on from Cetus I then visited Eridanus – some Gx are closely associated with those in Cet, but left NGC 1084 until too late as it set into some trees, I might have time for seeing this if we get any more clear nights.  I could not find NGC 1407, but it was close to the rooftop of next door and rudely he was using his central heating and the efflux was just under this spot. 

Surprise of the session was NGC 1535, a lovely PN Cleopatra’s Eye I had never seen before.  I used a 17mm Ethos initially with and without an OIII filter to try and bring up some more detail. It was nicely blue and internal details were evident.  I recommend this for a view if you have not seen it.

 

My next objects were then fairly low at -30 deg declination and in Puppis and Pyxis but were not visible to later on after they rose over a house roof or for the lower ones, emerged from behind a tree so time for a few lollipops, none of which needed the DSCs.  I checked out M42 Trapezium and pushed the magnification up to over 400 and clearly saw E and F, so worth checking out the Horse Head, sadly not visible even in an H Beta.  M78, NGC 2022, very small PN in Orion, M46 and NGC 2438 a large PN in M46, M47, NGC 2244 and some nebulosity from the Rosette nebula was clearly visible, M36,7 and 8.    Finally I spent a bit of time with Sirius looking for the pup.   I should have prepared better as I had no idea where it was, but no option to cheat.  Sirius was steady but was a bit too bright so took it to the edges leading and trailing in the EP, its interesting to see the diffraction spikes in the EP, but no star visible.  I also took it up and down out of the FOV to no avail.  (I see its now to the NE so Sirius can be left to leave the fov).  There are articles in Astronomy Now this month and latest Web society magazine how to observe, so will give it another go.  Top tip, 100 deg Eps are too difficult to see “around the corner” for this observation.

 

By this time 10:45 the Puppis objects were back in view and surprisingly one of the Pyxis ones as well, NGC 2613 a beautiful edge on Spiral GX in a deep black sky ( looking over the English Channel). NGCs 2567, OC had a nice row of 6 brightish stars lying N-S in the centre, this is very low at  -30.7 deg dec.  NGC 2571 was spotted as a loose cluster with two bright stars at the centre.  Finally a bit of a wait to 11:45 for NGC 2627 in Pyxis, this was difficult to spot in a plethora of background stars, but a faint haze was visible at the location and so a tick in the box. 

 

It was -1 C when I finished observing at just gone midnight, I was sweating inside my clothes and my hands were as warm as toast.  Feet on the other hand….    The DSCs certainly help locate objects more quickly but given that the clarity of the sky was not always great and the objects were not always in the fov, there was still some interest in hunting the objects down.  11 objects in one night is around double my normal tally.

 

Trevor

 

                                                           

 

                                                           

 

                                                           

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