NGC 1491 (also designated SH2-206 and LBN 704) is a bright emission nebula and HII region, located on the edge of a vast cloud region of neutral gas, about 10 700 light-years. The entire nebula is quite irregular. The major source of ionizing radiation is the blue star BD +50 886, which has been classified either as O5V star (Crampton, D., Fisher, W.A. 1974 Publ. Dominion Astrophys. Obs. Victoria Vol. 14, No. 12, p. 296-297) or as O4 star (Hunter, D.A., Massey, P. 1990, Astronomical Journal (ISSN 0004-6256), vol. 99, March 1990) The ionizing star is located about 1' to the east of the brightest emission. The blue star is illuminating the nebula while its strong stellar wind is “blowing” a bubble in the gas that immediately surrounds it.
This image shows an astrophotographer preparing for a night of imaging. As twilight almost disappears on the left side of the image a faint purple light can be seen on the right from an aurora. The winter Milky Way streaks down the center of the image with comet PanSTARRS and m31 to the left just above the horizon.
Thanks
Re: Submissions: 2013 April
Posted: Tue Apr 02, 2013 1:19 am
by wilsondm
Pleiades and Hyades
Copyright: Patrick Richter and Marcus Degenkolbe [attachment=0]widefield_plehy_nasa_big.jpg[/attachment]
NGC 5139 Omega Centauri
Copyright: Joaquin Polleri & Ezequiel Etcheverry Observatorio Panameño en San Pedro de Atacama (OPSPA) [attachment=1]Omega-Centauri-Joaquin-1.jpg[/attachment]
ISS Image Frontier - making the invisible visible
Copyright: Christoph Malin and Dr. Don Pettit
Curiosity Sol 223 with elevated Drill bit and Mt Sharp http://www.kenkremer.com
Copyright: NASA/JPL-Caltech/ Marco Di Lorenzo/Kenneth Kremer [attachment=4]Curiosity Sol 223_5n_Ken Kremer_APOD.jpg[/attachment]
The first of April was a pretty weird day in Cyprus, weather wise…
Bursts of dust from the Sahara desert are no strangers to our little island, but still…
Today the atmosphere was so saturated by the Saharan dust that I was able to shoot the Sun with my C8+ telescope *without* a solar filter!!!
I even captured a sunspot on the upper left part of the Sun!
Auroras danced in the sky from North to South and once they were directly above, the corona opened up and sent colorful rays in all directions. This magic moment lasts usually only a few moments. The Northern lights were a result of a fast-moving CME hitting Earths magnetic field.
Recent, rising full Moon - Perth, Western Australia
Posted: Wed Apr 03, 2013 2:48 am
by IanP
A couple of days ago during full-moon I took some nice pictures of the rising Moon over Perth CBD. One looks specially great (see attached photo) as it shows the just rising Moon between the BankWest and BHP towers.
This image was shot in one of my favorite 'dark sky' locations at Cape Palliser on the bottom of the North Island of New Zealand. This panorama covers almost 360 degrees horizontally, and is made up of 28 individual shots, giving an overall image size of over 275 megapixels. The photo shows the Milky Way high in the sky stretching from east to west. The Large and Small Magellanic Clouds can be seen below the arch of the Milky Way. These two objects are irregular dwarf galaxies and are only visible from the southern hemisphere. The light below the Milky Way to the left is the Cape Palliser Lighthouse, and the small glow on the horizon to the right is the Queen Mary 2 Cruise Ship en-route for Wellington, New Zealand.
A high resolution 13 megapixel image, which can be considered for publication as APOD, can be found here: High Resolution Image
-Noel
* If selected for APOD, the copyright/credit line should read the same as other DSS/POSS2 imagery, e.g., as shown on these APODs: Witch Head Nebula, M13
Structures in Eta Carina
Posted: Thu Apr 04, 2013 4:13 am
by sebyta
This sector of the nebula is not very prominent in photos, but is extensive in dark structures and hydrogen very showy and not very photographed.
200/1000
DSRL 450 refrigerated at 2 ° C
NEQ6 pro.
I hope you like.
More resolution http://www.astrofotografiadelcielosur.blogspot.com
Copyright: Sebastián Colombo BS. As. Argentina.
The lighthouse guiding light of comet C/2011 L4 (PANSTARRS). View of the city of western world's oldest (3,000 years old) Cadiz, Southern Spain. But safer than the comet is older than the city founded by the Phoenicians and later Roman domain. Now the domain is the universe and its wonders.
Authors Photo: Jesus Manuel Vargas and Maritxu Poyal held on March 14, 2013, Canon EOS 350 D tripod. 5 second exposures for panning. Canon Telephoto 75-300 mm diaphragm 5.6.
OGLE and the Magellanic clouds http://www.lco.cl
Copyright: Yuri Beletsky, Las Campanas Observatory, Carnegie Institution for Science [attachment=2]OGLE.jpg[/attachment]
Comet C/2011 L4 (PanSTARRS) has been hard to spot from southern Ontario, Canada. On the evening of Friday 5 April 2013 I took several tripod-based, wide-angle dSLR photos from the eastern shore of Lake Huron, about 8 miles south of the town of Kincardine. PanSTARRs and M31 look like very similar little smudges in the middle of this frame, shot at about 9 PM, an hour after sunset (Nikon D7000 at ISO 800, 30 sec, f/3.5 with Tamron 24-270 mm lens at 24 mm focal length).
Re: Submissions: 2013 April
Posted: Sun Apr 07, 2013 5:19 pm
by hims1526
Hello, it is my first time to post an image here.
6 consecutive days of M31 + Comet Pan-STARRS
Camera: Canon 500D
Lens: Day 1-2: EF-85mm & DSS 2x drizzle, f/4, iso 800, 60 seconds
Day 3-6: EF-200mm 2.8L, f/3.5, iso 800, 60 seconds
Mount: HL-1
Filter: Astronomik CLS-ccd filter
Software used: DSS, PixInsight, PS
Day 2 -6 are all stacked onto day 1's. Thus form this image. The comet should appear to be dimmer each day, however, this phenomenon does not appear on this image because
1) I have used 85mm and DSS 2x drizzle for the first 2 days, hence a rather low S-N ratio, whereas for day 3-5, I have used 200mm 2.8L therefore a rather hgih S-N ratio.
2) I used f/4 for the first 2 days and f/3.5 for day 3-5, this caused the brightness difference
3) PS technique was not so familiar for the first 2 days
4) Number of frames for day 1-2 were <25 and for day 3-4 >40... this provides the high S-N ratio
M31 is enhanced by masking my another photo that was taken in Sept 2012.
