Category Archives: Astronomy

Astroid 2012 DA14 tonight !

As you may have come across news articles that asteroid 2012 DA14 will be fly by earth very closely. It will in fact come closer than the Moon and some Geo stationary satellites.

You can see the live event in SLOOH SpaceCamera if you think you are in a wrong timezone.

Following is the heaven’s above chart.

Ajay Talwar did a fantastic job by calculating the  speed of the asteroid relative to the sky which is very helpful to spot it using a telescope. Note that you need at least a small telescope or good binocular to spot it even when it is closest because the apparent magnitude would be little beyond what unaided human can see at the darkest location.

Here is the approximate schedule created by Ajay Talwar considering the viewer from New Delhi

15th February
23:53 IST – 2012DA14 rises in the constellation of Centaurus, apparent speed 0.44 degrees per minute, Mag 8.8
16th February
00:27 IST – crosses into Hydra, apparent speed 0.71 degrees per minute, Mag 0.78
00:29 IST – close to beta Hya, apparent speed 0.72 degrees per minute, Mag 7.8
00:41 IST – crosses into Crater, apparent speed 0.82 degrees per minute, Mag 7.4
01:02 IST – crosses into Virgo, apparent speed 0.92 degrees per minute, Mag 7.0
01:05 IST – closest approach (approximately for India), apparent speed 0.92 degrees per minute, Mag 6.9
01:10 IST – close to beta Vir, apparent speed 0.91 degrees per minute, Mag 6.9
01:21 IST – crosses into Leo, apparent speed 0.87 degrees per minute, Mag 6.8
01:25 IST – close to beta Leo, apparent speed 0.84 degrees per minute, Mag 6.9
01:44 IST – crosses into Ursa Major, apparent speed 0.69 degrees per minute, Mag 7.2
02:33 IST – close to M109 galaxy, apparent speed 0.34 degrees per minute, Mag 8.4
03:24 IST – crosses into Draco, apparent speed 0.07 degrees per minute, Mag 9.3
04:57 IST crosses into Camelopardalis (headed directly towards Polaris), apparent speed 0.07 degrees per minute, Mag 10.5
Dawn break in Delhi

Astronomer Phill Plait will be doing live hangout during this event , you can catch him at Google Plus.

ISS Trails

Couple of weeks back I spotted the ISS but I was not well equipped to capture a trail against the “Fixed” stars. On 3rd Jan me and  Joy wanted to capture it from roof. It was evening time but ISS was relatively fainter and lower in the horizon. Also the sky was almost covered by  cloud. Following tables ( taken from heavens-above.com) have all the details

Date: 03 January 2013
Orbit: 400 x 422 km, 51.6° (Epoch: 07 January)
Event Time Altitude Azimuth Distance (km) Brightness Sun altitude
Rises 18:29:52 311° (NW) 2,298 0.9 -8.7°
Reaches altitude 10° 18:32:02 10° 302° (WNW) 1,442 0.0 -9.1°
Maximum altitude 18:35:02 36° 234° (SW) 652 -1.5 -9.8°
Drops below altitude 10° 18:38:03 10° 165° (SSE) 1,447 -0.4 -10.5°
Sets 18:40:13 157° (SSE) 2,308 0.5 -11.0°

Sky Chart (Courtesy heavens-above.com)

ISS Sky Chart

I tried to click the trail with 20 and 25 second exposure but sky was too bright to distinguish the trail.
ISS Trail 2

Another one is here. The trail is very faint but next time I will try to spot it in the morning.