Asteroid 2000 PH5 - Astronomy News

Blobrana

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Posts: 131433

Date: Aug 14 16:58 2014

Asteroid 54509 YORP (2000 PH5)

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Asteroid 54509 YORP (2000 PH5) makes its closest approach to the Earth (0.490 AU) on the 15th August 2014

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     Mag
2014 08 14    14 01 16.3 -11 31 19   0.4906  0.9736    71.3    80.2    23.9
2014 08 15    14 06 57.6 -11 57 55   0.4904  0.9776    71.8    79.8    23.9
2014 08 16    14 12 39.4 -12 24 01   0.4904  0.9817    72.3    79.3    23.9
2014 08 17    14 18 21.4 -12 49 37   0.4905  0.9857    72.8    78.8    23.9
2014 08 18    14 24 03.6 -13 14 40   0.4909  0.9897    73.3    78.4    23.9
2014 08 19    14 29 45.9 -13 39 09   0.4914  0.9937    73.7    77.9    23.9
2014 08 20    14 35 28.2 -14 03 04   0.4920  0.9977    74.2    77.4    23.9
2014 08 21    14 41 10.2 -14 26 23   0.4929  1.0016    74.7    77.0    23.9
2014 08 22    14 46 52.0 -14 49 05   0.4939  1.0056    75.2    76.5    23.9
2014 08 23    14 52 33.3 -15 11 09   0.4951  1.0095    75.6    76.0    23.8
2014 08 24    14 58 14.1 -15 32 35   0.4964  1.0135    76.1    75.5    23.8
2014 08 25    15 03 54.2 -15 53 21   0.4979  1.0174    76.5    75.1    23.8
2014 08 26    15 09 33.5 -16 13 27   0.4995  1.0212    76.9    74.6    23.8
2014 08 27    15 15 11.8 -16 32 52   0.5013  1.0251    77.4    74.1    23.8
2014 08 28    15 20 49.1 -16 51 36   0.5033  1.0290    77.8    73.7    23.8
2014 08 29    15 26 25.3 -17 09 38   0.5054  1.0328    78.2    73.2    23.8
2014 08 30    15 32 00.1 -17 26 58   0.5076  1.0366    78.6    72.7    23.9
2014 08 31    15 37 33.6 -17 43 37   0.5100  1.0404    79.0    72.3    23.9

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Blobrana

L

Posts: 131433

Date: May 18 21:55 2013

Asteroid 54509 YORP	Permalink

54509 YORP (2000 PH5) is an Apollo Near-Earth Object (NEO) discovered on August 3, 2000 by the Lincoln Laboratory Near-Earth Asteroid Research (LINEAR) Team at Socorro. Measurements of the rotation rate of this object provided the first observational evidence of the YORP effect, hence the name of the asteroid. The asteroid is an Earth coorbital object, or quasi-satellite. Source See more __________________

Blobrana

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Posts: 131433

Date: May 18 21:53 2013

Asteroid 54509 YORP (2000 PH5)

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Orbital Elements at Epoch 2454800.5 (2008-Nov-30.0) TDB
Reference: JPL 77 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.2300647942384214	9.8342e-08
a	1.005603853697793	1.5341e-09	AU
q	.7742498100114464	1.0004e-07	AU
i	1.600259806900129	3.8891e-06	deg
node	278.3814992241002	6.6121e-05	deg
peri	278.6560954614718	6.3311e-05	deg
M	193.9262558266046	4.7192e-06	deg
t_p	2454970.417181907189 (2009-May-18.91718191)	4.5336e-06	JED
period	368.3314649829354 1.01	8.4286e-07 2.308e-09	d yr
n	.9773805233193386	2.2365e-09	deg/d
Q	1.236957897384139	1.887e-09	AU

Orbit Determination Parameters

# obs. used (total)	543
# delay obs. used	4
# Doppler obs. used	1
data-arc span	1826 days (5.00 yr)
first obs. used	2000-08-03
last obs. used	2005-08-03
planetary ephem.	DE405
SB-pert. ephem.	SB405-CPV-2
quality code	0
fit RMS	.55774
data source	ORB
producer	Otto Matic
solution date	2005-Aug-10 11:32:29

Additional Information

Earth MOID = .000343171 AU

T_jup = 6.030

Source

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Blobrana

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Posts: 131433

Date: May 18 21:52 2013

Asteroid 2000 PH5	Permalink

Observing the Spin-Up of an Asteroid For the very first time, astronomers have witnessed the speeding up of an asteroid's rotation, and have shown that it is due to a theoretical effect predicted but never seen before. The international team of scientists used an armada of telescopes to discover that the asteroid's rotation period currently decreases by 1 millisecond every year, as a consequence of the heating of the asteroid's surface by the Sun. Eventually it may spin faster than any known asteroid in the solar system and even break apart. Read more The minor planet 2000 PH5 is a very interesting object for the study of peculiar dynamical phenomena. We have shown that 2000 PH5 is in a Sun-Earth horseshoe orbit with orbital parameters that may suggest an origin in the Earth-Moon system. D. Vokrouhlický has suggested that 2000 PH5 may be an excellent candidate for detecting the evolution of asteroid spin states due to thermal reemission of sunlight (YORP effect) Read more __________________

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