Thanks for the email. I'd not noticed anything but April. Looks like there are three different years in which October encounters are projected. Wish now that I'd archived the page. Maybe Google or the Wayback Machine has older versions.
http://neo.jpl.nasa.gov/risk/2004mn4.html
couldn't get this one to do anything. Probably I have disabled Java in the browser.
http://neo.jpl.nasa.gov/cgi-bin/db_shm?des=2004%20MN4
Object range of possible size (m) Date Nominal Dist (km) Min possible distance (km) Max possible distance (km) 2000 EH26 138-314 2190-04-17 897600 2000 SG344 31-69 2069-05-02 1196800 23936000 2002 VX91 38-87 2133-11-02 1331421 2001 BA16 17-37 2191-01-16 1196800 2000 UK11 22-54 2153-11-04 792880 2002 AJ129 530-1200 2172-02-08 1376300 10247454 2001 FR85 29-51 2185-03-19 1196800 2003 YN107 12-27 2065-12-13 1421180 2002 FD6 95-210 2172-04-07 1496000 2002 CU11 508-940 2143-09-02 1077120 1998 KM3 302-680 2149-12-07 1496000 1998 KY26 27-33 2185-06-09 1496000 2001 AV43 27-63 2117-11-23 1300005 2002 AJ129 530-1200 2180-02-08 1346380 2002 GR 59-138 2102-03-22 1481040 2001 AV43 27-63 2029-11-23 1525898 10247453 2004 FU4 530-1200 2189-10-26 284240 2002 PN 29-66 2146-01-29 296203 2003 DW10 16-36 2050-03-02 299195 2004 FU4 530-1200 2122-10-26 762960 26135120 2004 MN4 330-740 2029-04-13 62831 34407 88263 2000 EH26 138-314 2106-04-21 1047200 149600 2393600 (2135) Aristaeus 670-1500 2240-04-02 1196782 224396 7046059 2004 FH 19-45 2070-01-11 373994 239356 3365952 2001 WN5 558-1260 2028-06-26 249828 245340 254316 2000 WO107 330-740 2140-12-01 273764 255812 291715 (85604) 1998 OX4 170-370 2148-01-22 296196 295937 296455 1999 AN10 736-1600 2027-08-07 388960 385968 1998 MZ 366-820 2116-11-26 429645 390450 803340 (7753) 1998 XB 508-1148 2311-12-04 404301 401242 407504 2001 GQ2 250-566 2100-04-27 558008 442816 689656 (2340) Hathor 384-860 2194-10-23 897600 448800 6732000 1998 SC15 348-780 2095-04-09 1196800 448800 3141600 2002 CU11 508-940 2080-08-31 628311 568471 688150 2003 YT1 1000-3000 2148-04-29 682166 589415 2377110 1999 RQ36 178-390 2060-09-22 718080 658240 777920 2003 SR84 25-60 2081-09-28 911051 703109 4241698 2002 LV 1000-3000 2076-08-04 1286541 733029 2468364 1999 VP11 530-1200 2086-10-22 897600 733040 1988 TA 186-410 2053-10-01 1346400 748000 6881600 2002 NN4 260-590 2130-06-07 1047185 762949 2932118 (54509) 2000 PH5 77-174 2104-01-02 787362 787335 787389 1999 FA 210-470 2143-03-07 1136960 807840 1899920 (4660) Nereus 614-1380 2166-02-11 942480 807840 7076080 1999 MN 130-300 2137-06-04 819796 812316 828772 (2340) Hathor 384-860 2086-10-22 861696 837760 911064 2000 LF3 126-288 2046-06-13 1047200 897600 4936800 (35396) 1997 XF11 1000-3000 2028-10-26 930349 929002 931695 1999 DB7 220-494 2048-02-28 976126 974106 978145 (2340) Hathor 384-860 2069-10-21 984368 982872 985864 2002 NY40 348-780 2038-02-11 1090119 1006015 1176736 1999 MN 130-300 2110-06-04 1018761 1011281 1027737 2001 AV43 27-63 2013-11-18 1117346 1019808 1209947 2000 YA 48-115 2011-12-26 1102552 1099560 1614184 2001 AD2 288-650 2133-04-05 1304493 1124975 1539362 1998 HH49 130-300 2023-10-17 1172864 1135464 1211760 2002 PN 29-66 2052-01-30 1331421 1166863 1481018 2004 BL86 420-940 2015-01-26 1346380 1196783 3156515 (4660) Nereus 614-1380 2060-02-14 1198296 1197698 1198894 2000 WO107 330-740 2093-11-30 1288037 1213238 1361134 2003 RM10 230-518 2141-09-04 1219222 1214585 1223860 2002 SY50 1000-2000 2071-10-30 1346380 1241662 1481019 2002 TZ66 18-40 2074-10-05 1510938 1301501 1735335 2001 BF10 81-182 2085-04-28 1458579 1316461 1585737 2002 NN4 260-590 2070-06-06 1522906 1326933 1738327 2003 RU11 20-50 2034-09-17 1455587 1421030 1492388 2000 LB16 420-940 2163-12-14 1585760 1470568 1736856 1999 JU3 316-710 2076-12-06 1561816 1557463 1565990
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2004 MN4
http://neo.jpl.nasa.gov/risk/2004mn4.html
Here are two more; the Near-Earth Objects (United Kingdom) website shows both as needing more observation, and the latter as having been "lost" after its 1997 discovery.
2004 VD17
http://neo.jpl.nasa.gov/risk/2004vd17.html
1997 XR2
http://neo.jpl.nasa.gov/risk/1997xr2.html
Biggest Threat So Far In Most Ways
Posted by Mark Eby on 12/24/2004 7:43:40 AM
http://www.habitablezone.com/space/messages/362407.html
"1997 XR2 is a practically permanent list member because it has not been tracked since 1997 after only 44 days of tracking. 2004 VD17's more specific Palermo scale ranking has been stable for several weeks after a similar period of observation with about 4 times as many individual observations and will probably take long term observation to eliminate from the list."