Mix , observatii si ATM / Miscellaneous , observations and ATM

10 April 2017: I observed  the Moon with the 90x600mm refractor  with  magnifications from 24x / Plossl 25mm to 100x / Baader 6mm.
I used Moon & Skyglow filter as well as colored ones : green, yellow, red and blue.
The best results I got were with  the red filter, by which, at 100x, I saw eight or nine ray-craters spread over the Moon's surface.
Remarkable is a radius starting from Tycho, crossing the entire moon to the North-West.
I attach a picture, generally unsuccessful, but in which you can see this amazing radius that "crosses" with all the forms of the lunar relief.

I took note of the position of eight of the ray-craters I remembered, last night I did not have the Moon map with me and I did not took notes.

10 Aprilie 2017 : Am observat Luna cu luneta de 90x600mm la mariri de la 24x/Plossl 25mm pana la 100x/orto Baader 6mm. 
Am folosit filtre ,atat Moon&Skyglow cat si colorate :verde ,galben,rosu si albastru. 
Cele mai bune rezultate le-am obtinut cu filtrul rosu , prin care , la 100x ,am vazut opt sau noua cratere cu raze ,raspandite pe suprafata Lunii. 
Remarcabila este o raza care pornind din Tycho ,strabate intreg discul selenar pana spre limbul nord-vestic. 
Atasez o poza ,in general nereusita dar in care se vede binisor aceasta raza uimitoare care strabate ''cu nepasare'' prin toate formele de relief selenar. 
Am notat pe poza pozitia a opt dintre craterele cu raze despre care mi-am amintit, aseara nu am avut harta selenara la mine si nu am luat notite.

The 90x600mm refractor , the 60x700mm refractor and Fujinon Mariner 7x50mm binocular.

2'' to 1.25'' reduction,University 12.5mm Ortho and Revelation 9mm Plossl.

''Circle T'' Kellner 9mm , orthoscopic 6mm ,Huygens 20mm ,Huygens 9mm and Huygens 6mm oculars.

LV 30mm/2'' ocular ,University 12.5mm Ortho and Revelation Astro 9mm Plossl .

Penelopa 1.5''  DIY pipe -mount , 60x700mm refractor and Lybar chair.

Jupiter Corona on 2 May 2017.

The status of my time tested 125mm F/7 Dobsonian didn't look good.
The worn out legs , ground board and merry-go-round of my 125mm F/7 Dobsonian.
Time for refurbishment !

New ground board with good legs , rubber armored.

The old helicoidal focuser have worn out threads.

Another focuser ,still helicoidal.

 Instead of the merry-go-round I choose teflon on LP record azimuthal bearing.

 

A new reinforcing ring for the primary mirror end.

Colimation is a must !

Ready for fight ,again!

Moon Corona 3 of May ,2017.
Pics taken with the Nikon Coolpix S3300 compact camera.

 Moon and Jupiter on 5-th of May 2017.

Crepuscular rays in the evening of 27 May 2017.

Work on my home-made 200mm F/6.16 Dobsonian called ''Toleascope''.
The optics -mirrors , oculars ( like Sirius 25mm and Televue Radian 6mm ),6x30mm  finder ,1.25'' colimation laser and the first Ravneberg open-tube mounting were provided by my friend Alin Tolea , a Mecena of Romanian amateur Astronomy.
I started modifications of the mounting to a solid tube ''circus canon'' type to be better adapted for Urban Astronomy.

The rocker , altitude bearings and Stellafane type ground board.

An ocular shelf under development.

Just a mock-up assembly!

The HC-2 ''Kineoptics'' focuser and DIY adapter.

The solid tube is rolled 0.5 mm galvanized steel sheet.

The sky is the limit !

Lunar Fantasy -a study in pixels

Messier 61 /NGC 4303

Messier 61 is a barred galaxy , part of the Virgo  Cluster.
To find M 61 we may start at Porrima /Gamma Virginis , itself a beautiful double star worth of close examination.
From Porrima we should navigate toward West to the next naked eyes bright star Zaniah or Eta Vir.
From Zaniah we should change course toward North to 16 Virginis a fifth magnitude star.
Once we get there ,we are close to Messier 61.

Insert a low power ocular , let say of  25mm focal length and look for the star asterism adnotated below as ''a-b1-b2-c-d1-d2''.
Choose the star raw at East , namely b1-c-d1.
Follow the direction from ''a'' to ''d1''.
Go twice this distance further North and you will find a pair of stars.
The brighter is bearing the code HIP 60224 and it have a dimmer star to the North-East.
Imagine a right angle triangle having the right angle corner in the dimmer star.
At about twice the distance between HIP 60224 and the ''corner star'' , toward East-South East it lie Messier 61.

The above screen-print from Aladin Lite is not rendering well  the brightness difference between HIP 60224 of  8.15 mv  and the ''corner star'' which at 10.35 mv  is much dimmer ,with more than two magnitudes.
The magnitudes quoted above are from Stellarium.

Stellarium is rendering better this brightness difference between the two ''guide stars''.
But of course ,the galaxy looked much , much fainter in the Revelation 9 mm Plossl ocular ,at 96x in my 125mm F/7 Dobsonian.
My first observation of M61 happened on May 14 and the second last night ,on May 17.
I saw just a dim ,hazy ,round patch of light , a very ,very dim one.
No structure , no shape , no central condensation.
For all this I will have to come back latter ,with a bigger telescope.
But I'm happy and grateful I was blessed with the view of this galaxy considered as big as our Milky Way and located at 53 million light-years.

Note :
The screen-prints are made from Aladin Lite and Stellarium and the notes were added with Paint.

Enigma din R Crateris / The R Crateris Riddle

The telescope I'm  using most often is pretty  old at 20 years  but not a ''classic'' because it is home made.

It is a Dobsonian with a 125mm F/7 very good primary mirror made by late Gavril Beches.

Currently the mounting is under refurbishment ,some parts gave up after two decades of stargazing.

The book where I got the target for the observation below  is a classic , ''Pleasures of the Telescope'' by Garrett Putnam Serviss.

https://archive.org/details/pleasurestelesc01servgoog

For a long time my pet  targets were double stars.
But since more than one year I'm addicted to a Deep Sky craze.
The  second week of May being around Full Moon , there were not   chances to see many galaxies in my small telescope...

On 10 and 12 of May I was looking for another type of  targets.
Like trying  to see Messier 68 , a globular cluster but without success.

Serviss suggest , while being in that part of the firmamant , to have a look to Delta Corvi which is a double star and to R Crateris ,a variable red star.

I started my star hopping with Algorab or Delta Corvi , an old friend because is the starting point when searching for Messier 104 ''Sombrero Galaxy''.
This time ,thanks to Serviss , I looked a bit more careful and ... yes , Delta Corvi is a not so  easy double star of very unequal stars ,separated by 24''  , split at 35x , if you look carefuly.
The dim companion is better seen at 69x /University 12.5mm ortho.

From Delta Corvi , I navigated toward West to Gienah Corvi /Gamma Corvi.
And here my science ended , I was not able to manage alone on the bright Moon lit sky ,among those dim and rare stars.
The Toshimi Taki atlas helped me to notice a triangular asterism located to the West of Gienah , composed of 31 Crateris -Eta Crt-Zeta Crt  .
The lower  side of this triangle ,namely 31 Crt- Zeta Crt  is pointing toward Gamma Crt.
From Gamma Crt the next step is bringing us to Alpha Crateris  or Alkes.
R Crateris is in the same field at 69x with Alpha Crt.
Here is a finder chart made using Stellarium and Paint.

R Crateris is the middle star of a boomerang shaped asterism of three stars.
The  color of the star was  ruddy and R Crt was the brighter  in the asterism.
Serviss is not mentioning that R Crt is also a double star.
Stellarium is stating R Crt have a separation of 63'' and PA= 268 degree.
I haven't searched in big data bases but I believe the companion is the small star of 9.9 mv we see in this print screen from Aladin Lite.

Checking with Stellarium,the position angle of the small star fit very well : R Crt is to the East of Alpha Crt .
The 9.9 mv star is located  between R Crateris and Alkes which lie to the West of R Crt .
This  mean a   PA of  about 270 deg against 268 degrees listed by Stellarium.
The difference in RA between R Crateris and the supposed companion is of about four seconds of time which mean 60'' against the separation of 63'' listed by Stellarium.
Again ,data agree well.

According to Simbad , R Crateris is a ''Helium burning asymptotic giant branch star'' :

However ,there is something  that I don't understand.
Stellarium is stating R Crt to be of 8.95 mv.
According to  Vizier the maximum brightness of R Crt is of 9.8 mv.

Stellarium is also showing the  9.8 mv brightness  in the row about range of variability.

But visualy ,R Crt was the brightest in the trio of stars shown in the screen-print.
Much brighter I dare to say...

So ,the ''riddle'' I found in R Crateris is this : how can a star of 8.95mv have a range of variability from 9.8 to 11.2 ?

Is this due to the different photometric systems used ?

Well ,it was fun to take a look at this giant red star.

But in the stellar world the red giant stars  are pretty cool .

So ,should I say it was ...cool ?

Observatii din primavara lui 2017/Observations Spring 2017-Part III

The Moon and Jupiter on the Eastern sky on March 30.

 Jupiter,the same evening ,  in the constellation Virgo at end of March,as  recorded by the Coolpix S3300 camera , between Spica and Theta Vir.

On 10 of April I was taking - at least I was trying - afocal pictures with my 90x600mm ''zoth'' RFT refracting telescope.

Here we see the 90mm RFT refractor on my DIY ''Penelopa'' pipe-mount with LV 30mm 2'' ocular.

 Mizar-Alcor-Sidus Ludoviciana in the 90mm RFT refractor.

Arcturus and the star 22 Boo.

Delta Boo and companion.

Dubhe -Alpha UMa and optical companion.

Mu Bootis- Alkalurops as a double star.
At 100x the dim star prove to be a tight double star itself.

The Moon and Jupiter on April 10 through the lens of Coolpix S3300 camera and SVBony ''Moon&Skyglow Filter''.

The Moon and Jupiter through the same camera and a green filter.

Life is not always smooth !

The broken arm of right hand ocular of the Sakura 9x60mm binocular.

But we are still looking confidently to the future !