Spectre de la nova du Dauphin. Lorsqu'une « nouvelle étoile » est apparue dans la constellation du Dauphin la semaine passée, les astronomes ont trouvé dans le spectre de sa lumière de quoi identifier sa vraie nature. Maintenant connue comme nova du Dauphin, le spectre de sa lumière visible à son maximum d'éclat est au centre de ce champ stellaire vu au travers d'un télescope et d'un prisme dans la nuit du 16 au 17 août depuis l'observatoire de Bülach en Suisse. Les fortes lignes d'absorption dues aux atomes d'hydrogène sont les plus marquées dans le spectre de la nova, mais elles sont bordées du côté rouge par de brillantes bandes d'émission.
C'est la signature spectrale typique des matériaux éjectés lors des explosions de binaires cataclysmiques, l'archétype des novae. Les autres étoiles du champ sont beaucoup plus faibles, identifiées par leur référence dans le catalogue Hipparcos, leur magnitude et leur type spectral. Traduction réalisée par : Didier Jamet > lire le texte original. Bright New Nova In Delphinus. Want to stay on top of all the space news? Follow @universetoday on Twitter The possible new nova is located in Delphinus alongside the familiar Summer Triangle outlined by Deneb, Vega and Altair.
This may shows the sky looking high in the south for mid-northern latitudes around 10 p.m. local time in mid-August. The new object is ideally placed for viewing. Stellarium Looking around for something new to see in your binoculars or telescope tonight? This map shows Delphinus and Sagitta, both of which are near the bright star Altair at the bottom of the Summer Triangle. Several hours later it was confirmed as a new object shining at magnitude 6.8 just under the naked eye limit. Here’s a reverse “black stars on white” map some observers prefer for greater clarity.
The only way to know is to go out for a look. Despite the name, a nova is not truly new but an explosion on a star otherwise too faint for anyone to have noticed. Model of a nova in the making. About Bob King. Nova in Delphinus - Observing. The field of the nova is easy to locate north of the familiar star pattern of Delphinus. To its west, Sagitta, the Arrow, points toward it. Use the chart at right, or sky chart, which is a slightly modified version of page 64 from Sky & Telescope's Pocket Sky Atlas.
Here's a 10°-wide comparison-star chart from the American Association of Variable Star Observers (AAVSO). The nova is the cross at center. As the nova dims, make an appropriate new chart with the comparison-chart maker starting on the a href=" target="new_window">AAVSO home page. Discovery of Nova Delphini 2013 The nova was discovered by Koichi Itagaki of Yamagata, Japan, in an image taken at 14hh Universal Time (2 p.m. What Is A Nova? A classical nova happens in a special kind of tightly-orbiting binary star system: one where a relatively normal star pours a stream of hydrogen onto the surface of a companion white dwarf.
Locating-Nova-Del-2013. New bright nova erupts in Delphinus. The new nova in Delphinus is bright enough to see in binoculars. This reverse “black stars on white” map will help you locate it. Click to see more maps, wide and tighter. Created with Chris Marriott’s SkyMap Earlier today Japanese amateur astronomer Koichi Itagaki photographed a new bright nova in the constellation Delphinus (del-FYE-nuss).
At the time it was a little below the naked eye limit (6.8 magnitude) but it’s since risen to around 6. That means observers with dark skies can see our new guest without optical aid. And if you don’t have dark skies, don’t worry. For the moment, the new object goes by the cumbersome temporary designation PNVJ20233073+2046041 (PNV stands for possible nova). Photo taken this evening in Italy of new apparent nova in Delphinus. What’s exciting about this “new star” is that it’s just gearing up and could brighten even more.
Using the chart above, I hope you’ll be able to find the nova the next clear night. Nova Delphini 2013 brightens. A one-minute time exposure of the constellation Delphinus and the nova taken last night. I’ve labeled stars with magnitudes so you can track changes in the nova’s brightness. The magnitudes are visual ones taken from the Tycho catalog. Credit: Bob King If it wasn’t for the bright moon, you’d be able to see the new nova with the naked eye even from the suburbs. But who knows? By tonight it could bust that barrier. Last night Nova Delphini was magnitude 4.8 and still brightening. I took a photo of Delphinus and the nova last night and annotated it with additional star magnitudes so you can watch it fluctuate in brightness in the coming nights.
Star atlases, like this view of Orion from Cambridge Atlas 2000.0, show star brightness as different sized dots. Astronomers use the magnitude scale to measure star and planet brightness. The larger the magnitude, the fainter the star. Chart to help you find Nova Delphini 2013 with magnitudes shown. Keep an eye on the nova’s color. Nova del 2013 : magnitude, graphiques, observations. V339 Delphini (= Nova Delphini 2013): brightness evolution Nova Delphini 2013: variation between 18 Aug (max), 12 Sept. and 10 Oct. Possible nova PNVJ20233073+2046041: 14 Aug. 2013 Nova Del 2013: light curve Above is the podcast from our Nova del 2013 live session Note (15.4 Aug 2013) : this object was officially classified as a nova on CBET 3628 (accessible by subscription), where the nature of the nova was unveiled by our spectroscopy!
At a glance: - 10 Oct. 2013 - Tonight, Nova Del 2013 was found at magnitude 9.0R, about three mags fainter than last observations, one month ago. Below is an image taken with the PlaneWave 17″ unit, after the average of 10, 10-seconds unfiltered exposures: the star is the brightest object, at the center of the frame: Nova Del 2013: 10 Oct. 2013 Spectroscopy shows evident evolution, compared to one month ago (for example, a new feature developed between H-gamma and H-beta): Spectrum of Nova Del 2013: 10 Oct. 2013 - 4 Sept. 2013 - Nova Del 2013: 04 Sept. 2013.