Larger comets and asteroids

http://www.minorplanetcenter.net/iau/lists/Dangerous.html
http://impact.arc.nasa.gov/


http://donsnotes.com/science/astronomy/asteroids.html

25143 Itokawa (1998 SF36)
12/22/09 oes
01/05/07
08/01/04 oes/w
06/25/04 neo/w
01/26/04 oes/w
09/11/01 oes
05/24/01 neo
0/9/29/98 oes


10 Largest Asteroids

Name	Diameter (mi.)	Comments
Ceres	621.86
Pallas	376.96
Vesta	333.56
Hygeria	279
Euphrosyne	229.4
Interamnia	217
Davida	200.26
Cybele	191.58
Europa (3)	179.18
Patienta	171.12
Chiron (2)	100-150

(2) Chiron is categorized as both an Asteroid and Comet. 
(3) Not to be confused with a moon of Jupiter with the same name.

See: Potentially Hazardous Asteroids (PHAs) at the Asteroids page.

2P/Encke
09/16/00
http://en.wikipedia.org/wiki/Tropical_Storm_Norman_(2000)
http://www.hpc.ncep.noaa.gov/tropical/rain/helene2000.html
http://adsabs.harvard.edu/abs/2006cosp...36.2359S
http://www.volcanolive.com/komaga-take.html
Volcano: Ulawun
Location: Papua New Guinea
Eruption: September 29, 2000 (VEI-4)


01/03/04

01/03/04	Earthquake	7.1	Southeast of the Loyalty Islands

08/07/10 nso

8/12/10	Earthquake	7.1	Pastaza, Ecuador
08/10/10	Earthquake	7.3	Vanuatu
08/01/10	Solar storm		Solar storm

04/21/07 nso

04/21/07

Earthquake

6.2

Aisén Fjord, Chile

Name	Last	Next (Perihelion)	Magnitude
2P/Encke	2000	2003 December 29	4
C/2002 T7 (LINEAR)		2004 April 23	1-2
C/2003 T3 (Tabur)		2004 April 28	8
C/2001 q4 (NEAT)		2004 May 15	1-2
C/2003 K4 (LINEAR)		2004 October 13	5-6
Halley	1986	2061
Chiron (2)	1996	2046
C/1996 B2 (Hyakutake)	1996	10-18,000 (3)
Hale-Bopp	1997	5500
Tempel-Tuttle	1998	2031
Swift-Tuttle	1992	2122
Thatcher	1861	2276

29P/Schwassmann-Wachmann 1
Perihelion: 2004 July 10
Normally extremely faint, it occasionally experiences large outbursts in brightness
02/25/96 - alignment
a stronger than normal brightness outburst during 1996 February

C/2011 C1 (McNaught)
Perihelion: 2011 April 17
Maximum magnitude about 12

C/2010 X1 (Elenin)
Perihelion: 2011 September 10
Maximum magnitude about 5

45P/Honda-Mrkos-Pajdusakova
Perihelion: 2011 September 28
Maximum magnitude about 7

73P/Schwassmann-Wachmann 3
Perihelion: 2011 October 16
Maximum magnitude about 12

C/2009 P1 (Garradd)
Perihelion: 2011 December 23
Maximum magnitude about 7

As of 2004 there were 26 known asteroids larger than 200 km in diameter.
Ceres is the largest by far at 933 km in diameter. Most are in the asteroid belt, but some are closer in or farther out.

Chiron was discovered in 1977. It lies between Saturn and Uranus and occasionally passes within the orbit of Saturn. At first thought to be a comet or asteroid it is now considered a "planetoid" or small planet-like body. It is 170 km in diameter.

No.   Name   Distance (km) Radius (km) Mass   Discoverer   Date
----  --------    ------    ------  -----  ----------  -----
2062 Aten         144514       0.5   ?      Helin       1976
3554 Amun         145710       ?     ?      Shoemaker   1986
1566 Icarus       161269       0.7   ?      Baade       1949
 433 Eros         172800      33x13x13      Witt        1898
1862 Apollo       220061       0.7   ?      Reinmuth    1932
2212 Hephaistos   323884       4.4   ?      Chernykh    1978
 951 Gaspra       330000       8     ?      Neujmin     1916
   4 Vesta        353400     265  3.0e20    Olbers      1807
   3 Juno         399400     123     ?      Harding     1804
  15 Eunomia      395500     136  8.3e18    De Gasparis 1851
   1 Ceres        413900     466  8.7e20    Piazzi      1801
   2 Pallas       414500     261  3.18e20   Olbers      1802
 243 Ida          428000      35     ?      ?           1880?
  52 Europa       463300     156     ?      Goldschmidt 1858
  10 Hygiea       470300     215  9.3e19    De Gasparis 1849
 511 Davida       475400     168     ?      Dugan       1903
 911 Agamemnon    778100      88     ?      Reinmuth    1919
2060 Chiron      2051900      85     ?      Kowal       1977

During the past decade, there were several volcanoes that had eruptions measuring VEI-4 on the Volcanic Explosivity Index.

Volcano: Ulawun
Location: Papua New Guinea
Eruption: September 29, 2000 (VEI-4)
Ulawun is considered one of the world's most dangerous volcanoes due to its structural instability and close location to population centers.

Volcano: Shiveluch
Location: Russia (Kamchatka Peninsula)
Eruption: May 22, 2001 (VEI-4) (Eruption has been ongoing since 1999)
Shiveluch is one of Kamchatka's largest and most active volcanoes. Fortunately, the closest settlement is 50km away and can be quickly evacuated.

Volcano: Ruang
Location: Indonesia (Sangihe Islands)
Eruption: September 25, 2002 (VEI-4)
Ruang is not to be confused with the volcano Raung on Java, Indonesia.

Volcano: Reventador
Location: Ecuador
Eruption: November 3, 2002 (VEI-4)
Reventador is one of Ecuador's most active volcanoes.

Volcano: Manam
Location: Papua New Guinea
Eruption: January 27, 2005 (VEI-4) (Eruption was ongoing since 2004)
The eruption of Manam killed 5 people and forced 9,000 to evacuate the island. The island is no longer inhabited. Manam is one of Papua New Guinea's most active volcanoes.

Volcano: Rabaul caldera (Volcano involved was Tavurvur)
Location: Papua New Guinea
Eruption: October 7, 2006 (VEI-4)
The initial blast from the eruption shattered windows 12km away and sent up an ash plume 18km high.
The Rabaul caldera is considered one of PNG's most dangerous volcanoes due to settlements on the edge of the caldera. When Tavurvur and Vulcan erupted simultaneously without warning in 1994, the city of Rabaul had to be abandoned.

Volcano: Chaiten
Location: Chile
Eruption: May 2, 2008 (VEI-4)
This was Chaiten's first eruption in over 9,400 years. The eruption forced the evacuation and relocation of the town of Chaiten.

Volcano: Okmok
Location: USA (Aleutian Islands, Alaska)
Eruption: July 12, 2008 (VEI-4)
Okmok explosively erupted without any warning. Seismic activity began only 5 hours prior to eruption. Fort Glenn, a nearby ranch, had to be evacuated.

Volcano: Kasatochi
Location: USA (Aleutian Islands, Alaska)
Eruption: August 7, 2008 (VEI-4)
The large crater lake in Kasatochi vanished due to the eruption. It has since filled back up.

Volcano: Redoubt
Location: USA (Alaska)
Eruption: March 22, 2009 (VEI-4)

Volcano: Sarychev Peak
Location: Russia (Kuril Islands)
Eruption: June 11, 2009 (VEI-4)
Sarychev erupted just as the International Space Station was passing overhead. This allowed the space station to photograph and observe the eruption. Sarychev Peak is one of the most active volcanoes of the Kuril Islands.

Volcano: Eyjafjallajokull (pronounced "AYA-feeyapla-yurkul".......I think.)
Location: Iceland
Eruption: April 14, 2010 (VEI-4)
In the past, eruptions of Eyjaffawhatchamacallit were followed by eruptions of nearby Kalta. For the time being, Kalta shows no signs of an impending eruption.