Showing posts with label AAVSO. Show all posts
Showing posts with label AAVSO. Show all posts

Saturday, October 8, 2011

Carnival of Space 218


Photo: - Jekert Guapo

Yes its that regular event that comes around once a week which has a webpage hit count that resembles a Cataclysmic Variable Star's light curve....or perhaps a crazy roller coaster.

CARNIVAL OF SPACE!!!! .....and this is a bumper issue.

So Welcome! This week I am live blogging from the AAVSO's Centenary Meeting, celebrating an amazing 100 Years of variable star observations from an incredible organization of dedicated amateur and professional astronomers who have collected and archived 20.7 Million observations (as of yesterday afternoon) since 1911. I cover this event in more depth (below) in my Blog, but just let me share with you this incredible video of the 100 year light curve of SS Cygni.



Its Carnival Time!

Super Novae Buffet!

After the past month's supernova excitement, Laura Chomiuk discusses how Pan-STARRS is shedding light on a new, ultra-luminous type of supernova.

Gianluigi at Doc Madhatten Blog traces the history of supernova research. Starting from the supernovae of Brahe and Galilei, to describe the importance of the supernovae in astronomy research and to tell the Nobel Prize in Physics 2011.
On a side note congratulations to my fellow Australian Brian Schmidt (and Riess & Perlmutter) for the recognition this week from the Nobel committee. Aussie, Aussie Aussie!!!.....ah sorry you have probably heard that too many times in all the wrong places already.

On the same topic - the Minute Physics Channel Guest narrator Sean Carroll of Caltech describes dark energy and the acceleration of the universe, the discovery of which was awarded the 2011 Nobel Prize in Physics on October 4th.


Space Mission Update!


Riofrio Space Time Blog reports on the October 4 anniversary of the launch of Sputnik, an event that affected humanity in ways too numerous to count. Replicas of Sputnik hang in museums like the National Air and Space Museum. At San Francisco's Beat Museum we hear a fascinating tale, that pieces of Sputnik may have been recovered.

At the Weirdwarp Blog - Space Expedition Curacao plans to fly space tourists on sub-orbital trips starting in 2014 at about half the price of Virgin Galactic. Check the safety instructions on the card in the back of the seat here.

Last week, scientists announced findings based on data from the SPICAM spectrometer onboard ESA’s Mars Express spacecraft. Ray Sander's on Universe Today Blog discusses the findings reported in Science by Maltagliati et al (2011), reveal that the Martian atmosphere is super-saturated with water vapor.

Beyond Apollo Blog discusses what self-sufficiency in outer space might look like. In a paper presented in October 1989 at the 40th Congress of the International Astronautical Federation, two veteran space scientists proposed a 10-year program aimed at establishing a self-sufficient science outpost that would serve as testbed for space settlements.

The Urban Astronomer reports on data released by NEOWISE shows that there are fewer mid-sized asteroids in near-Earth orbit than we perviously thought. This means that the risk of a city-busting impact are lower than we thought. Not that that's any reason to become complacent!

With gold at record prices, find your own nuggets and dig for gold in the Chandra archive.

Over at BigThink.com Dr. Kaku addresses a question posed by Steven Lee Spall: Can we build a space elevator?

Space Coalition is running a competition - Dream about space? Make a video and enter to win an iPad 2. The Coalition for Space Exploration is hosting this video/blogging contest.

Vintage Space looks at what really killed the Dyna-Soar: a brief history covering its roots, life, and eventual cancellation. That might be a different Dinosaur to what you're thinking ;-)

Finally in Mission Update a call to action from Habitation Intention explaining how the Apollo age was not the age we where most tempted to quit space exploration, but now is.

Telescopes!
ALMA is up and running!
Image: ALMA (ESO/NAOJ/NRAO)/W. Garnier (ALMA)


Weird Warp
opens our coverage of a new telescope starting to look at the universe. ALMA is the most powerful millimetre/submillimetre wavelength telescope in the world. These are longer wavelengths roughly about 1000 times longer than visible light wavelengths. Using these wavelengths ALMA allows astronomers to study really cold objects in the universe such as dense clouds of cosmic dust and gas from which stars and planets form as well as distant objects in the early universe.


ALMA (ESO/NAOJ/NRAO). Visible light image: the NASA/ESA Hubble Space Telescope

Discovery News also covers the first image from the ALMA array.

Bente from Planet Bye also features a number of the first light images.


Credit: NRAO/AUI and J. Hibbard

Armagh Planet visits the Paranal site of European Southern Observatory. Well, if you have ever seen James Bond movie Quantum of Solace then you will have seen a glimpse of this amazing facility! If it’s good enough for Bond, then it must be quite a place, Armagh Planet updates us on exactly what it is, where it is, and what work is done there! (A LOT!)

Solar System(s)!
Next Big Future looks at possible causes of CMEs including whether a comet may have caused a coronal mass ejection. This also relates to an article form Jan,2010 at nextbigfuture which examined the future threat of man made solar explosions causing a super massive coronal mass ejection.

Smaller Questions examines Kepler trends and finds it turns out, Earth-sized planets in habitable zones around low-mass stars are not as rare as Kepler initially led astronomers to believe (not Kepler the guy--he's dead--but Kepler the exoplanet-scouting satellite).

Astronomy Media!
The Space Show: welcomes Dr. David Whitehouse of the UK, the world’s most cited science journalist, to the show to discuss science and space journalism, space policy in the UK, the U.S. and much more.

PortaltotheUniverse is where the whole space community comes together in one place; connect your blogs now for live feeds of your blogs into the Astronomy Community.

Big Think discusses career opportunities in the 21st Century. In this video, Musk describes how he has come to recognize opportunities as an entrepreneur in the space industry, which is one of the core skills necessary for success in the 21st century.

So that is it for Carnival 218! Thanks for dropping by AARTSCOPE where our mission is to - "create the sense of anticipation and discovery that keeps us asking questions".

I leave you with my unique, personal tribute to the AAVSO's 100 years of service to the Astronomy Community!


The Carnival of Space is a community of interest blog carnival bringing together the best and brightest Astronomy & Space Blogs at a single point in space and time (commonly referred to as a web address) each week. Previous episodes can be found here. If you run an astronomy or space science blog you can contact carnivalofspace @ gmail.com to be added to the editorial circulation list.

For a guide on how to prepare an episode of Carnival of Space Habitation Intention has produced a GDoc as a template guide.

Sunday, March 13, 2011

FS Aur Video

As you all know I have been helping Dr Vitaly Neustroev with his research on FS Aur. This is a very erratic variable star that can vary in magnitude by up to 0.2m over an hour, has a number of interacting periodic cycles, and goes into outburst every 13-15 days.

Whilst this video doesn’t really do justice to all the hardwork and the more subtle variations, it none the less is a bit of fun to show you what we have been looking at.

The timescale is a very rough 1 sec = ~2 days.


Enjoy!!!!

Astroswanny

Sunday, March 7, 2010

GW Lib data to support Hubble COS mission

One of the delights of being an amateur astronomer is being able to assist real scientists with (hopefully) useful data on various targets that they need to keep an eye on prior to observation runs with toys that I can't afford eg the HST.

An alert (Notice#417) went out this week from the AAVSO requesting data on two cataclysmic variable stars to support Dr Paula Szkody's upcoming spectrograph observations on the Cosmic Origins spectrograph on the HST.

GW Lib is a CV that needs to be fainter than Mag 14 when the mission takes place, and it has been known to infrequently outburst.

AAVSO members regularly fly cover and give early warnings on any unexpected events that may affect the mission integrity.

GW Lib is at DEC -25.00.25 so that immediately eliminates a good number of the world's telescopes. Australia has had large monsoonal lows pushing into the interior of Australia and the weather has been pretty ordinary this week as a result.


My choice of a couple of 300 sec images was a little short in duration as the SNR was a bit low with the moon still being at 55%. I was able to confirm that the target was about Mag 15.39 (given the low SNR maybe a little closer to 16) in the Johnson V filter (untransformed).

I'll try again tonight with a little longer exposure.

Peter

UPDATE: 10/03/2010
JD Airmass GW_Lib 147 143 Err SNR
2455265.209 1.11373 15.501 14.422 14.000 0.025 42
2455265.214 1.100 15.421 14.432 13.988 0.031 34
2455265.219 1.08756 15.514 14.422 14.003 0.041 26

Ave 15.479 14.425 13.997 0.032 34

Peter

UPDATE: 11/03/2010
Today I tidied up my Sequence a little, deleting 128 and I added 157 to the comp star list as visually it looked to be the identical magnitude to GW Lib. I also stacked the three images with a median combine to give a much much stronger SNR. With the SNR of a number of the comp stars now being over 100 (preferred) the Magnitude of 147 was almost identical to the chart magnitude listed in AAVSO chart 2084CCS. Comfortable with the improvement in accuracy GW Lib magnitude was measured at 15.629 (Johnson V untransformed).

Note the stronger SNR of the target now at 60 with the comp star's SNR >100.


Seven AAVSO members contributed observations and Dr Paula was pleased to hand the observations to the Hubble space controllers this morning who then gave the go-ahead for tonights UV run on the Cosmic Origins spectrograph.

Congrats to Dr Paula, hope everything goes well tonight! It all starts again on the 14th as the next COS run is on V842 Cen.

Saturday, September 26, 2009

When you wish upon a star

Welcome. This week has been characterised by some fairly average weather. Those of you tuning into Australia's premier football event around the world this afternoon will see plenty of our famous Melbourne weather on show.

Weather can have an impact on an observing campaign, so there have been some challenges in obtaining some of the data I have been chasing this week. I am getting great positive feedback on the blog - largely because I am blogging on my observations.

So this week, given the weather, I thought it would be good to talk about observation campaigns. This week I have barely jagged a couple of short sessions on
V4743 SGR and some of the surrounding variables in the same field. V4743 Sgr is also referred to as Nova Sgr 2002c making it an object of some interest, given its nova outburst in 2002. Over 200 observers have contributed to the AAVSOs lightcurve.



So what is it that makes an object "interesting"? Clearly a Nova outburst is something that is interesting, as professional astronomers are quick to follow up with highly accurate spectroscopy. The advantage of having amateurs "on their toes" and participating in regular campaigns is that professional astronomers can't afford to have billion dollar telescopes pointed at stars, waiting for years, for something to happen. (The hubble deep field shot is a noteable exception...but a deliberate experiment to look at nothing to see if something WAS there)

A good example of leveraging the skills of amateur astronomers is my data here on QU Sgr. This is a Mira variable star of little or no interest to anyone.....but who knows one day it may be significant or do something. If that ever happened, what would we have to compare it with? So whilst gathering some data on V4743 with my set up which has a fairly large field of view, it is important to grab a couple of readings on any other Variables in the field, as other observers are unlikely to ever go specifically to QU Sgr to collect data.



There are a plethora of variable stars requiring regular observations and a limited number of observers. Today we have the fantastic use of social networking, blogs, forums and membership of organisations such as AAVSO. In this environment connected communities of dedicated amateurs have organised campaigns based on a prioritised list of "interesting objects".

Rod Stubbing who discovered this months outburst of VX For was working through a carefully targeted list of variables that were "in season" ie at an optimal position in the sky for observing. Rod indicated to me it was his first observing session on VX For for the year. So you never know what you will find, and how many other people who are observing.



So I leave you this week with the completely insignificant Mira Variable QU Sgr that noone else has reported on for over 4000 days.

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