Stars from India sky...
Great opportunity to be at a southern latitude location than usually... 9°3 does not allow you to see the south pole, but some constellations are new for a northern astronomer amateur like me.

The matieriel used is a simple digital camera (sony DSC W12) on a tripod. Image format are in jpg. 

Sensibility is set to 400iso and the maximum exposure capability is used. Click here to see other examples and better description of the setting with images of a comet.

The trick is:

- Use the longuest exposure, here 30s, but to minimize earth rotation effect 20s was a better choice

- serie of images are taken, then registered and added. IRIS freeware has been used to process the images

One single exposure - Orion
Orion constellation, 30 s exposure, 400 iso - not usual to see it at the zenith - Image size reduced by a factor 2

The camera is simply put on its back on the ground. You can recognize a coconut tree. The star are not pinpoint, but slightly recorded as a line. In 30s with camera focal, the exposure was too long to "freeze" the earth rotation.

Constellation line simulated - Map on the right from "Carte du ciel" - The Orion Nebula M42 can be seen in the "sword" of the hunter Orion
Between Sirius and Canopus...

13 exposures registered then added to produce a 260s exposure image of the Sirius - Canopus region - Image reduced by a factor 2

The very nice colorful pattern in the right bottom corner is just the head of a local guy, quite interested by my setting and staying here for the conversation...

Comparison of the image with a star atlas map - In the "head" of the visitor, we can see the Canopus star, a bright -0.63 mag star, F0II spectral type

1:1 region of M41 or the 260s exposure image.
No dark or flat field correction. Compared to map, the 7 mag can be obtained.
The sky was moderately polluted by the lamps of the hotel.

M41 is an open cluster in the south of the Sirius star, at 4 degrees.

It contains about 100 stars, the more luminous star of this cluster is about 700 times more luminous than our Sun. The stars are distributed over a volume about 25 or 26 light years across, and all receding from us at 34 km/sec. As they are at a distance of 2,300 light years, they appear scattered over an area of 38 arc minutes diameter.

The age of M41 was estimated around 200 million years.

It belongs to the messier object catalog, and more informations can be found here, at the messier database website

Image from SEDS

Now, let's compare the single shot image with the registered and added sequence. Much more faint stars are visible and this with no specific telescope or equatorial mount. The trick is in the registration algorithm used in Christian's IRIS software. If you set the SETREGISTER value to 2, the COREGISTER2 command simply detect stars, match the greatest possible number, and compute distorsion and rotation coefficient to eliminate the earth rotation over the image sequence length... Learn more on Virtual Equatorial
One single exposure, 20s 13 single exposures of 20s added, 260s - 4:30 min
Between Sirius, Orion and the trees...

15 shot of 20 s each - 300s exposure but tree partially cover the region. It was impossible to point as it's a zenith view - 1:4 reduction

The registration of the 15 images been done using the stars, the tree appears to move, but that's the earth rotation effect !...

Large view, Milky Way ?
Mosaic of the 2 images - with some sphere effect to give the illusion of the sky above... We can barely note the milway, crossing the sky as plotted on the map.