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View Full Version : Near-Earth-Asteroid 2015 TB145 Passes Nearby on 2015 OCT 31



Centaur
2015-Oct-20, 07:14 PM
Near-Earth-Asteroid (NEO) 2015 TB145 is about 0.5 km in diameter and expected to pass 1.27 lunar distances from Earth on 2015 OCT 31 at 15:14 UT (10:14 CDT).

Wikipedia Article: https://en.wikipedia.org/wiki/2015_TB145

Iíve created a view from north of the solar system, an equatorial chart and a geocentric ephemeris. They can be viewed at www.CurtRenz.com/asteroids.html

Photos and descriptions of the asteroid would be welcome additions to this thread.

tony873004
2015-Oct-21, 02:31 AM
Thanks Curt! I like your Equatorial Chart image. It really shows just how quickly this asteroid moves across our sky.

I made a couple YouTubes. I hope you don't mind me sharing these in your thread.

This is a view from Earth looking at the asteroid as it passes by. (Asteroid and Moon sizes exaggerated!)
https://www.youtube.com/watch?v=gtxKw4-Y3Pk

And in this one, you get to view Earth / Moon from the asteroid. (Earth and Moon sizes not exaggerated)
https://www.youtube.com/watch?v=3_qcK9Dv9TI

Superluminal
2015-Oct-21, 08:43 PM
Coinciding with the Orionid meteor shower, I wonder if it is a piece of Halley's Comet?

Centaur
2015-Oct-21, 09:13 PM
Coinciding with the Orionid meteor shower, I wonder if it is a piece of Halley's Comet?

Thatís an astute conjecture, but appears to have arisen from a coincidence. The asteroid has an orbital period of a little more than 3 years and an aphelion of slightly less than 4 Astronomical Units, which is in the asteroid belt between Mars and Jupiter. Comet Halley has an orbital period of about 75 years and an aphelion of about 35 AU, which is beyond the orbit of Neptune. The asteroid and comet orbit the Sun in essentially opposite directions, while in significantly different planes.

George
2015-Oct-22, 03:22 PM
Based on my unproven calculations, it looks like its apparent mag. would be somewhere within the range from about 7 to 11.5 at closest approach. [I'm using a phase angle of 90 deg, albedo range of 0.02 to .25, diameter range of 0.28km to 0.31km.]

[Added: Of course, the size used is very likely already tied to the albedo, thus the 7 is highly unlikely]

Centaur
2015-Oct-25, 04:53 PM
I've added an hourly ephemeris for the asteroid in addition to the daily ephemeris that was already there: www.CurtRenz.com/asteroids.html

publiusr
2015-Oct-31, 07:53 PM
Even looks like a skull
http://earthsky.org/space/big-asteroid-will-safely-pass-earth-on-halloween-october-31-2015?utm_source=EarthSky+News&utm_campaign=5feb18399d-EarthSky_News&utm_medium=email&utm_term=0_c643945d79-5feb18399d-394080473#big

Buttercup
2015-Oct-31, 07:55 PM
Even looks like a skull
http://earthsky.org/space/big-asteroid-will-safely-pass-earth-on-halloween-october-31-2015?utm_source=EarthSky+News&utm_campaign=5feb18399d-EarthSky_News&utm_medium=email&utm_term=0_c643945d79-5feb18399d-394080473#big

Yes!! I noticed that yesterday (Twitter) and made that comment; looks like a skull.

And today is Halloween, as we all know.

Centaur
2015-Nov-01, 04:05 PM
Here's a link to an animated sequence of photos of the asteroid that I found posted at the Tesla Motors Club: 2015 TB145 (https://plus.google.com/102864255013905949025/photos/photo/6212070216723936530?pid=6212070216723936530&oid=107316294793809570474)

They were made by Thad Szabo who is a professor of physics and astronomy living in in Long Beach, California.