Closest asteroid in recorded history - Page 2

Varangian (John) · #21 08-01-2013, 03:23 PM

Okay, I'll ask the question in order to answer all the questions I get about it from all the laypeople I tell. Is there any chance this thing can hit us? 20,000 km is blooming close. Regards, John.

clueless · #22 08-01-2013, 03:27 PM

Is this asteroid the same asteroid that is passing us on Thursday..

"PLANET Earth will get a close look at a wandering demon when asteroid Apophis passes within a few million kilometres on Thursday." ????

http://www.dailytelegraph.com.au/new...-1226549305351

pluto (Hugh) · #23 08-01-2013, 03:32 PM

Quote:

Originally Posted by clueless

Is this asteroid the same asteroid that is passing us on Thursday..

"PLANET Earth will get a close look at a wandering demon when asteroid Apophis passes within a few million kilometres on Thursday." ????

http://www.dailytelegraph.com.au/new...-1226549305351

This thread was about "2012 DA14" which is different from "99942 Apophis"

gary · #24 08-01-2013, 03:40 PM

Quote:

Originally Posted by Varangian

Okay, I'll ask the question in order to answer all the questions I get about it from all the laypeople I tell. Is there any chance this thing can hit us? 20,000 km is blooming close. Regards, John.

Hi John,

Imagine for a moment that in the future, conflicting news reports came out about
whether a new object was going to hit Earth or not. Suddenly, a whole lot of "experts"
with seemingly credible credentials would come out of the woodwork, some
unequivocally stating that it would hit and others just as forcefully arguing it would
not.

Who would you believe?

In such a hypothetical scenario, go here to the IAU Minor Planet Center at Harvard.
http://www.minorplanetcenter.org/iau/mpc.html

If those people say it will miss, then it will miss. If they say it will hit, then
it will be time to put the head between the legs.

This time with regards minor planet 2012 DA14, they have computed it will miss.

clueless · #25 08-01-2013, 03:49 PM

Thanks Pluto, I thought so. I started a different threat for 99942 Apophis and someone told me to see this thread...which has nothing to do with 99942 Apophis

mithrandir (Andrew) · #26 08-01-2013, 03:52 PM

Quote:

Originally Posted by 04Stefan07

What about Melbourne? I don't fully understand all these numbers the generator is pumping out.

Does anyone know a good website that has detailed descriptions of what each column means and how to use it. I would like to learn how to read these complex tables.

If by that you mean:

Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC Azi_(a-appr)_Elev APmag delta deldot S-O-T /r S-T-O Cnst L_Ap_SOL_Time
2013-Feb-15 18:00 10 56 40.71 -58 45 54.8 214.9957 52.3767 9.25 0.00029774617094 -4.9792007 107.7070 /L 72.2754 Car 03 49 52.4574

the explanations are all further down the page.

You are probably only interested in RA/Dec and/or Az/Elev and either the time in UTC or local apparent solar time.

clueless · #27 08-01-2013, 03:53 PM

Quote:

Originally Posted by 04Stefan07

What about Melbourne? I don't fully understand all these numbers the generator is pumping out.

Does anyone know a good website that has detailed descriptions of what each column means and how to use it. I would like to learn how to read these complex tables.

LOL mate, we've got just over a month to learn

gary · #28 08-01-2013, 04:44 PM

Hi Stefan,

Here you go.

Hopefully the following is self evident.

Melbourne is +11 hours ahead of UTC.

Melbourne
144.975800,-37.831594,0.0529483 {E-lon(deg),Lat(deg),Alt(km)}

HTML Code:

************************************************************************************
 Date__(UT)__HR:MN     R.A._(ICRF/J2000.0)_DEC Azi_(a-appr)_Elev  APmag   Illu% Cnst
************************************************************************************
 2013-Feb-15 12:00     00 45 52.92 -83 01 11.1 188.6560  36.3905  13.75  34.869  Oct
 2013-Feb-15 13:00     01 03 25.36 -84 24 46.1 186.5521  35.7229  13.38  35.968  Oct
 2013-Feb-15 14:00     01 55 34.16 -86 12 36.4 184.4216  36.2909  12.93  37.576  Oct
 2013-Feb-15 15:00     05 34 16.10 -87 36 49.0 182.9299  38.4645  12.37  40.031  Oct
 2013-Feb-15 16:00     09 37 51.84 -84 21 42.0 183.3906  42.7738  11.64  44.018  Oct
 2013-Feb-15 17:00     10 39 05.09 -76 01 00.4 189.4299  50.0034  10.64  51.107  Cha
 2013-Feb-15 18:00     11 02 32.96 -58 39 55.0 215.7319  59.2798   9.23  65.127  Car

For example, consider the first row.
2013-Feb-15 12:00 corresponds to 23:00 on the night of 15th Feb in Melbourne.
RA is 00:45:52.92 and Dec is -83:01:11.1, which corresponds to an azimuth of 188.6 degrees (i.e in the south) and a elevation of 36 degrees
above the horizon. At that time it will be 34% illuminated with an apparent magnitude of 13.75, so pretty dim.
At that instant, it will be in Octans.

gary · #29 08-01-2013, 06:30 PM

Quote:

Originally Posted by clueless

too confusing for me....I'll try the coordinate thing and even though I can't really find the SCP, I can get pretty close.......
I'm on the sapphire coast near Merimbula.....2548.......
Andrew

Hi Andrew,

Here is the ephemeris for Merimbula, NSW.
Center geodetic : 149.901110,-33.898044,0.0486492 {E-lon(deg),Lat(deg),Alt(km)}

HTML Code:

************************************************************************************
 Date__(UT)__HR:MN     R.A._(ICRF/J2000.0)_DEC Azi_(a-appr)_Elev  APmag   Illu% Cnst
************************************************************************************
 2013-Feb-15 12:00     00 44 11.88 -82 52 40.8 188.2002  31.8250  13.76  34.754  Oct
 2013-Feb-15 13:00     01 02 24.24 -84 14 20.0 186.1776  31.2729  13.39  35.855  Oct
 2013-Feb-15 14:00     01 54 17.73 -86 00 00.0 184.2464  31.9531  12.94  37.472  Oct
 2013-Feb-15 15:00     05 17 15.76 -87 25 34.1 183.0970  34.1839  12.38  39.948  Oct
 2013-Feb-15 16:00     09 24 02.58 -84 22 53.9 184.0603  38.3887  11.65  43.968  Oct
 2013-Feb-15 17:00     10 31 31.57 -76 05 48.0 190.5737  45.1026  10.66  51.103  Cha

clueless · #30 08-01-2013, 10:04 PM

Thanks Garry I'll work it out now

Varangian (John) · #31 08-01-2013, 10:53 PM

Yes thank you for the link Gary, very informative and one to bookmark. Regards, John.

Quote:

Originally Posted by gary

Hi John,

Imagine for a moment that in the future, conflicting news reports came out about
whether a new object was going to hit Earth or not. Suddenly, a whole lot of "experts"
with seemingly credible credentials would come out of the woodwork, some
unequivocally stating that it would hit and others just as forcefully arguing it would
not.

Who would you believe?

In such a hypothetical scenario, go here to the IAU Minor Planet Center at Harvard.
http://www.minorplanetcenter.org/iau/mpc.html

If those people say it will miss, then it will miss. If they say it will hit, then
it will be time to put the head between the legs.

This time with regards minor planet 2012 DA14, they have computed it will miss.

glenc (Glen) · #32 10-01-2013, 05:42 AM

The asteroid 2012 DA14 will be between the star cluster NGC 3532 and the nebula NGC 3372 at 5am DST on 16 Feb 2013. The attached SkyMapPro map shows the Southern Cross and these two objects. You will see the asteroid moving slowly towards the north (top right) if you use binoculars.

mr bruess · #33 10-01-2013, 05:58 AM

were gonna live!
The asteroid is not going to hit the earth!

Baddad (Marty) · #34 10-01-2013, 08:55 AM

Does this become catagorised as another apocalypse?
If so, then I have survived 7 world ending apocalpses.

Cheers

mbyrr (Antony) · #35 10-01-2013, 09:43 AM

Quote:

Originally Posted by glenc

The asteroid 2012 DA14 will be between the star cluster NGC 3532 and the nebula NGC 3372 at 5am DST on 16 Feb 2013. The attached SkyMapPro map shows the Southern Cross and these two objects. You will see the asteroid moving slowly towards the north (top right) if you use binoculars.

So does this mean I will be able to see it with my 8" dob? (assuming I can find it)
I'm in Melb.

glenc (Glen) · #36 10-01-2013, 10:19 AM

Yes Anthony. You can calulate its position here using your latitude and longitude (37.5S, 145 E). Add 11 hours to get DST.
http://ssd.jpl.nasa.gov/horizons.cgi#top

okiscopey (Mike) · #37 10-01-2013, 10:29 AM

Here's a speeded-up view of 2012 DA14's varaible but rapid progress through the constellations in Sky Safari Plus.

Only my second YouTube video, so quality not the best!

http://www.youtube.com/watch?v=hUEfO...ature=youtu.be

mbyrr (Antony) · #38 10-01-2013, 10:34 AM

Quote:

Originally Posted by glenc

Yes Anthony. You can calulate its position here using your latitude and longitude (37.5S, 145 E). Add 11 hours to get DST.
http://ssd.jpl.nasa.gov/horizons.cgi#top

Thanks Glen, will check that out!

clueless · #39 10-01-2013, 10:43 AM

Thanks Glen...

Quote:

Originally Posted by glenc

The asteroid 2012 DA14 will be between the star cluster NGC 3532 and the nebula NGC 3372 at 5am DST on 16 Feb 2013. The attached SkyMapPro map shows the Southern Cross and these two objects. You will see the asteroid moving slowly towards the north (top right) if you use binoculars.

clueless · #40 10-01-2013, 10:47 AM

Quote:

Originally Posted by okiscopey

Here's a speeded-up view of 2012 DA14's varaible but rapid progress through the constellations in Sky Safari Plus.

Only my second YouTube video, so quality not the best!

http://www.youtube.com/watch?v=hUEfO...ature=youtu.be

Good job mate...
Andrew