<10=less than 10 LD from Earth

EBN Timeline for February 2012

<HS=inside Earth's Hill sphere
M<1=less than 1 LD from the Moon
E<1=less than 1 LD from Earth (intruder)
LD = lunar distance = distance between Earth & Moon

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29 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
21392012 EA enters Earth's Hill sphere840023362012 DS32 closest lunar approach = 2.84 LD
04352012 EZ1 enters Earth's Hill sphere830020352012 DR32 last observed optically, by Eschenberg Obs. at 10.98 LD inbound, V=18.3 reported
1848discovery MPEC issued for 2012 DJ54
1846discovery MPEC issued for 2012 DH54
11512012 DW60 observed first, by Spacewatch 1.8m at 15.51 LD, R=20.2 reported, elon. 149.3°
06542012 DU60 observed first, by LINEAR at 10.87 LD, mag 19.3 reported, elon. 161.1°
28 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
09202012 DS32 enters Earth's Hill sphere82002030discovery MPEC issued for 2012 DW43
00392012 FN enters 10-LD bubble810006212012 DS32 last observed optically, by ARO Westfield at 4.12 LD inbound, V=17.7 reported
01442012 DM32 last observed optically, by ARO Westfield at 11.49 LD outbound, V=19.9 reported
27 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
15522012 CS46 exits Earth's Hill sphere710017212011 CP4 last observed by radar, from Arecibo at 29.81 LD outbound, V=nil
09592012 DN31 enters 10-LD bubble720016462012 DX13 last observed by radar, from Arecibo at 12.32 LD outbound, V=nil
05302012 DX13 exits 10-LD bubble620011132012 DJ54 observed first, by PS1 at 5.96 LD, V=21.9 reported, elon. 153.7°
04412012 EZ1 enters 10-LD bubble720011112012 DH54 observed first, by PS1 at 13.31 LD, w=21.9 reported, elon. 153.8°
01352012 DM32 exits 10-LD bubble620009332012 DW43 last observed optically, by Tholen team/Mauna Kea at 22.00 LD outbound, R=20.1 reported
0119discovery MPEC issued for 2012 DS32
0116discovery MPEC issued for 2012 DR32
0105discovery MPEC issued for 2012 DM32
26 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
04412012 DY exits 10-LD bubble72002112discovery MPEC issued for 2012 DN31
16492012 DX13 first observed by radar, from Arecibo at 7.59 LD outbound, V=nil
10232012 DW43 observed first, by PS1 at 20.24 LD, w=21.8 reported, elon. 162.7°
25 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
21212012 DX exits 10-LD bubble820023052012 CS46 closest Earth approach = 2.75 LD - Note: JPL reports an approach uncertainty of +/- 16 hours and 51 minutes.
19092012 EP10 enters Earth's Hill sphere920019392012 DX13 last observed optically, by Great Shefford Obs. at 4.96 LD outbound, R=18.0 reported, elon. 81.6°
16052012 DJ54 exits Earth's Hill sphere910015182012 DX13 closest Earth approach = 4.86 LD
13522012 DZ exits 10-LD bubble920009592012 DS32 observed first, by CSS at 9.81 LD, V=19.3 reported, elon. 156.6°
07462012 DS32 enters 10-LD bubble1020009552012 DR32 observed first, by CSS at 24.59 LD, V=19.7 reported, elon. 154.4°
05522012 DM32 observed first, by MLS at 7.79 LD, V=19.4 reported, elon. 144.1°
04382012 DY13 last observed optically, by Spacewatch 1.8m at 16.27 LD outbound, V=21.70 calculated
03542012 DN31 observed first, by LINEAR at 12.69 LD, mag 18.1 reported, elon. 123.1°
24 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
06192012 CS46 enters Earth's Hill sphere92002005discovery MPEC issued for 2012 DJ14
04292011 CP4 exits 10-LD bubble910008162012 DY closest Earth approach = 9.21 LD
01072012 DX13 enters 10-LD bubble101000159discovery MPEC issued for 2012 DA14
23 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
22582012 EA enters 10-LD bubble91002057discovery MPEC issued for 2012 DY13
21192012 DF4 exits 10-LD bubble81002054discovery MPEC issued for 2012 DX13
18172012 DZ exits Earth's Hill sphere910014012011 CP4 closest Earth approach = 9.11 LD
13232012 DY13 exits 10-LD bubble920011252012 DJ14 last observed optically, by CSS at 13.07 LD outbound, V=19.2 reported
04182012 DX exits Earth's Hill sphere1020003172012 DM32 closest Earth approach = 6.70 LD
00402012 DA14 observed first, by La Sagra Obs. at 11.24 LD, V=18.9 reported, elon. 114.4°
22 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
23332011 CP4 enters 10-LD bubble1030023022012 DZ closest Earth approach = 2.52 LD
12042012 DY enters 10-LD bubble930018372011 CP4 last observed optically, by SSS at 10.66 LD inbound, V=16.3 reported
04582012 DJ14 exits 10-LD bubble830016352012 DJ54 closest Earth approach = 1.48 LD
03482012 DZ enters Earth's Hill sphere930008532012 DJ14 observed first, by CSS at 10.36 LD, V=19.1 reported, elon. 165.4°
07252012 DY last observed optically, by ARO Westfield at 10.17 LD inbound, V=19.2 reported
06052012 DY13 observed first, by CSS at 5.01 LD, V=19.1 reported, elon. 171.6°
01272012 DX closest lunar approach = 2.08 LD
21 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
23022012 DY13 exits Earth's Hill sphere920019072012 DJ54 closest lunar approach = 1.25 LD
20062012 DF4 exits Earth's Hill sphere930018192012 DX closest Earth approach = 1.96 LD
19212012 DA14 exits 10-LD bubble940012322012 DX last observed optically, by MLS at 2.04 LD inbound, V=18.2 reported
04422012 DY13 exits Earth-Moon system1040010512012 DZ last observed optically, by Mt. John Obs. at 6.12 LD inbound, R=17.6 reported
10002012 DX first observed by radar, from Arecibo at 2.12 LD inbound, V=18.02 calculated
09152012 BA102 last observed optically, by MRO at 45.60 LD outbound, R=22.5 reported
07182011 CP4 first observed by radar, from Arecibo at 18.07 LD inbound, V=16.49 calculated
07032012 DF4 closest Earth approach = 3.35 LD
06142012 DF4 last observed optically, by Great Shefford Obs. at 3.36 LD inbound, R=17.8 reported
06042012 CU last observed optically, by MRO at 51.07 LD outbound, R=21.8 reported
20 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
22112012 DY13 more than one LD from Moon1040122432012 DY13 closest Earth approach = 0.29 LD
18002012 DF4 enters Earth's Hill sphere104112232discovery MPEC issued for 2012 DF4
16432012 DY13 enters Earth-Moon system1031116492012 DY13 closest lunar approach = 0.49 LD
11282012 DY13 within one LD of Moon1031007422011 YW15 last observed optically, by ARO Westfield at 75.23 LD outbound, V=22.6 reported
08212012 DX enters Earth's Hill sphere10300
08172012 DZ enters 10-LD bubble10200
01192012 CS46 enters 10-LD bubble9200
19 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
22232012 DY13 enters Earth's Hill sphere820023212012 DJ14 closest Earth approach = 7.18 LD
17022012 DJ54 enters Earth's Hill sphere81001540discovery MPEC issued for 2012 DZ
04222012 DM32 enters 10-LD bubble80001538discovery MPEC issued for 2012 DY
01532012 DW43 exits 10-LD bubble70001536discovery MPEC issued for 2012 DX
09562012 DZ observed first, by CSS at 13.37 LD, V=18.6 reported, elon. 178.2°
07182012 DY observed first, by CSS at 14.12 LD, V=19.57 calculated, elon. 179.4°
06272012 DX observed first, by CSS at 6.25 LD, V=19.4 reported, elon. 152.4°
18 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
16512012 DF4 enters 10-LD bubble80002140discovery MPEC issued for 2012 CS46
08012012 DY13 enters 10-LD bubble70002135discovery MPEC issued for 2012 CQ46
17 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
17352012 DJ14 enters 10-LD bubble600012072012 DW43 closest Earth approach = 9.50 LD - Note: JPL reports an approach uncertainty of +/- 5 hours and 46 minutes.
15242012 DX enters 10-LD bubble5000
16 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
13242012 EP10 enters 10-LD bubble400012222012 DX13 observed first, by PS1 at 50.75 LD, w=20.7 reported, elon. 169.3°
12212012 DF4 observed first, by PS1 at 17.72 LD, w=20.4 reported, elon. 172.5°
06092012 DA14 closest Earth approach = 6.78 LD - Note: JPL reports an approach to 0.09 LD at 1925 UTC .
15 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
22152012 DW43 enters 10-LD bubble300008562012 CQ46 last observed optically, by Tholen team/Mauna Kea at 27.93 LD outbound, R=21.7 reported
08452012 CS46 last observed optically, by Tholen team/Mauna Kea at 17.59 LD inbound, R=21.2 reported
14 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
12092012 DJ54 enters 10-LD bubble200008402012 CS46 observed first, by PS1 at 19.26 LD, w=21.8 reported, elon. 168.6°
13 Feb. 2012
UTEvents
07282012 CQ46 observed first, by PS1 at 21.88 LD, w=22.2 reported, elon. 166.5°
03442011 YT62 last observed optically, by ARO Westfield at 141.02 LD outbound, V=22.2 reported
11 Feb. 2012
UTEvents
1325discovery MPEC issued for 2012 CL17
09162012 CL17 last observed optically, by Lister/Faulkes North at 26.78 LD outbound, R=20.6 reported
10 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
16422012 DA14 enters 10-LD bubble100007352012 CL17 observed first, by MLS at 21.60 LD, V=19.9 reported, elon. 162.1°
9 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1
03102012 CQ46 exits 10-LD bubble0000
7 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1
19552012 CL17 exits 10-LD bubble1000
6 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
10212012 CQ46 exits Earth's Hill sphere200000142012 CL17 closest Earth approach = 4.53 LD - Note: JPL reports an approach uncertainty of +/- 11 minutes.
5 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
10212012 CQ46 enters Earth's Hill sphere210022212012 CQ46 closest Earth approach = 3.61 LD - Note: JPL reports an approach uncertainty of +/- one hour and 37 minutes.
4 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1
23402012 BD14 exits 10-LD bubble2000
21572012 CU exits 10-LD bubble3000
04342012 CL17 enters 10-LD bubble4000
3 Feb. 2012
UTEvents
2002discovery MPEC issued for 2012 CU
10382012 BO11 last observed optically, by Spacewatch 1.8m at 37.57 LD outbound, V=21.42 calculated
2 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1Events
17362012 CQ46 enters 10-LD bubble300009412012 CU observed first, by LINEAR at 4.33 LD, mag 17.5 reported, elon. 126.7°
04232012 CU exits Earth's Hill sphere2000
1 Feb. 2012
UTBoundary Transitions<10<HSM<1E<1
10212012 BA102 exits 10-LD bubble2100
08582012 BX34 exits 10-LD bubble3100

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