"What can you see with different telescopes" article
29/9/2014 - An illustrated guide which shows what can you expect to see through eyepiece of different telescopes under various conditions.
Deep-Sky Hunter - new printable star atlas
1/4/2013 - I've finished making a new printable deep sky atlas, designed for serious DSO observers. It features 101 charts which cover entire sky, 21 "zoom in" maps, indicators of "best deep sky objects", nebulae outlines, common names and naviation marks.
Sketches of Omega centauri, Pinwheel galaxy and Messier 3
1/5/2014 - After I've finished working on an update to the galleries structure - it's time to post some new sketches. Obviously the most interesting entry is Omega Centauri (NGC 5139). Messier 3 is also worth noting - it was my first attempt to make a sketch on black paper.
Photos of Saturn and Jupiter's dual red spot
Jupiter's GRS is an ever changing feature, and lately it has aquired a neighbour - small red spot right nearby. At the right - a photo of Saturn taken with a new planetary camera (DFK21).
Sketches of galaxies and globulars
17/9/2012 - Drawings of some globular clusters and galaxies. Three clusters on top image are: M2, M79, M75. At the bottom left there is a ring-shaped open cluster Cr21 with two neighbouring galaixes; At the bottom right - the WLM (Wulf Lundmark Melotte) irregular galaxy, which proved to be a real challenge to spot with it's surface brightness nearing 15m. Click on images to see the full sized sketches.
Timelapse videos of milky way and a moonrise - 2012
At left there is a timelapse video of milky way, which I've made during this year's perseids meteor shower. At right there is a timelapse video of moon rising over Cyprus coastline, during a distant thunderstorm.
Transit of Venus and Jupiter occultation - 2012
6/6/2012 - Second (and last) transit of Venus I had a chance to observe. Visually this is a spectacular phenomenon, and I've yet to see a photo which compares to the visual expirience I had - seeing the dark disk of Venus hovering above large, bright Sun, filled with numerous sunspots.
15/6/2012 - There was yet another spectacular event - Jupiter occultation by moon. Again - no photos come even close to a sight which was observable through an eyepice: Blueish background, the Moon with it's bright earth-shine hovering over a rich starfield, while occulting the "tiny" Jupiter with it's 4 moons.
Sketches of the Markarian's Chain and the Coma cluster
21/4/2012 - During this night the sky was particulary dark and transparent, and since the galaxy hunting season is at it's end - I spent some time observing galaxy clusters with my new Skywatcher 250mm Newtonian. These are drawings of the Coma Cluster, and Markarian's Chain along with Messier 87.
|Markarian's Chain||Coma Cluster|
Articles: DIY dew control system, padded case, etc.
13/02/2015 - I've finished making my dew control system, which includes 4 heaters and a simple dew controller. Click on the image see an article about it.
Sketches of "Rosette" and "Pac Man" nebulae
21/11/2011 - Sketches of some star forming H-II nebulae regions - the Rosette and the Pacman. Observating session with 8" Newtonian was held at Negev desert, Israel.
|Rosette Nebula||Pac Man nebula|
Jupiter and io's shadow transit - timelapse animation:
22/10/2011 - Timelapse video of Jupiter's rotation, over a period of 2 hours.
A transit of Io and it's shadow is followed by GRS. Also the Callisto moon is visible. Video was taken from Rehovot city in Israel. Instruments: Canon 500D DSLR and 8" F/5 equatorial Newtonian. Seeing varied between fair to good (4..7/10). Click on image to watch the animation, or see it in Youtube:
More sketches and photos:
5/8/2011 - Results from last weekend's observations in Borot Lutz.
Sketches of North America nebula region, The Sculptor Galaxy, NGC 6781, etc
|North America Nebula||The Sculptor galaxy||NGC 6781|
Sketches: M13, M17 and B86:
06/5/2011 - Drawings of the Great Glubular Cluster in Hercules and the Swan nebula, made during observing session in Negev desert. The Inkspot nebula was sketched at july 1th, from the same location.
|Hercules Globular cluster||Swan Nebula||The Ink Spot nebula|
Light Pollution map of Israel (3rd update):
Map of an artificial night-sky brightness over Israel, updated with 2009 data from DMSP satellite.
This map is a rough estimate of naked eye stellar visibility. Another addition is demonstration of light pollution growth in Israel. (Links to page in Hebrew)
Sketches of Andromeda Galaxy, M35, and others:
2/12/2012 - These are results of my last observing session in Negev desert.
I've finally managed to sketch the Andromeda Galaxy (obvious target at this season),
as well as some other favorites of mine: M35 with it's partner, and maybe a little bit less familiar "Hickson 90" group of four faint galaxies in Pisces Austrinus.
|Great Andromeda Galaxy||open clusters||Hickson 90 group|
Articles on upgrades of a Newtonian telescope:
These articles might be helpful in making some easy, yet effective upgrades to their Newtonians. They describe various tweaks I made to my Orion Skyview pro 8" telescope: Flocking the tube interior, attaching secondary mirror heater, rear cooling fan, making a simple Bahtinov focusing mask. Also a review of Skywatcher BKP250 Newtonian has been added.
Sketches of double stars in Cassiopeia region:
18/09/2010 - These sketches were made while observing through Orion 8" newtonian telescope from Rehovot city in Israel. It was a long time since I last sketched double stars. They are a good reminder that there is color in the universe hiding within the stars, and not everything is gray.
|Eta Cassiopeiae||Iota Cassiopeiae||Sigma Cassiopeiae|
|Struve 163 (Cas)||Eta Persei||Iota Trianguli|
Telescope and Eyepiece calculator spreadsheet:
Some update and fixes to my telescope calculator, which can be used to calculate various parameters for telescope, eyepieces, and help in picking the right eyepiece. Also an eyepiece collection calculator has been added.
Veil nebula sketch:
10/09/2010 - I've finally managed to sketch the eastern part of the great Veil nebula (NGC 6995 and NGC 6995 - one of my favorite deep sky objects). Sketch was made using Orion 8" Newtonian, at relatively dark observing site in Negev desert in Israel -