2017-02-06 Tracking News

Contents on 6 February '17

Traffic Report -- eleven objects
IAU Minor Planet Center
- NEOCP Activity -- 79 listings
- New MPECs -- five MPECs
Observers -- 22 observers
Impact Risk Monitoring -- six objects
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page
Of 760 risk-listed objects, 47 have had news in the last 31 days. Updated at 1730 UTC on 6 Feb.
Ephemerides for risk-rated, nearby objects & NHATS targets
News archive (old) & news image catalog (discontinued)
Object Links - mainly for radar targets & close passers (mostly discontinued)
Observing Campaigns (revised 8 April)

The latest A/CC news is available via framed access, RSS news feed, or redirection.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. To keep track of what's new each day, watch the Chronology section.

Traffic Report on 6 February '17

Eleven objects reported inside ten LD

Eleven asteroids are reported within ten lunar distances (LD) of our planet today. Closest is NHATS target 2017 BG30, which is outbound from 2.50 to 2.69 LD. Newly announced 2017 CX1 moves out from 3.80 to 4.23 LD and 2017 CR comes its closest to Earth this time around -- 4.27 LD at 0348 UTC. Further away, two objects depart from our traffic reporting zone: intruder 2017 BS32 flies off from 8.08 to 10.64 LD and NHATS target 2017 BB7 from 8.94 to 10.47 LD.

Earth passage	I D	~Size	Distance Today	Notes

0.42 LD Feb. 2	2017 BS32	11 m	8.08 to 10.64 LD	exits ten LD, intruder

1.03 LD Jan. 31	2017 BJ30	16 m	7.71 to 9.00 LD	NHATS target

2.48 LD yesterday	2017 BG30	4 m	2.50 to 2.69 LD	NHATS target
2.97 LD Jan. 31	2017 BB7	9 m	8.94 to 10.47 LD	exits ten LD, NHATS target
3.36 LD Feb. 8	2017 BM93	16 m	5.57 from 7.62 LD	DOU
3.56 LD Feb. 4	2017 CX1	8 m	3.80 to 4.23 LD	NEW - MPEC
4.27 LD today	2017 CR	17 m	4.27 LD	Earth closest at 0348 UTC
4.84 LD Feb. 1	2017 BN92	25 m	7.86 to 9.02 LD	DOU

6.56 LD tomorrow	2017 BQ6	178 m	6.60 from 7.30 LD	DOU
7.10 LD yesterday	2013 FK	78 m	7.12 to 7.52 LD
8.64 LD yesterday	2017 BK30	12 m	8.64 to 9.01 LD	risk

This report was generated at 2112 UTC with new discovery 2017 CX1 (MPEC) and with first follow-up for outbound 2017 BN92 in today's DOU MPEC along with continuing follow-up for inbound 2017 BM93 and 2017 BQ6, approaching risk-listed 2017 CS and radar/NHATS target 2017 BW, and departed 2017 BQ30 and NHATS target 2017 BY.

Approaching (sorted by 10-LD bubble entry date)
4.64 LD Feb. 17	2017 BW	70 m	< 10 LD Feb. 9, radar/NHATS target - DOU
3.6 LD Feb. 24	2017 CP1	41 m	< 10 LD Feb. 15, uncertainty +/- 2.7833 hours
2.4 LD Feb. 23	2017 BY93	81 m	< 10 LD Feb. 21, uncertainty +/- 1.8167 hours, risk
2.7 LD March 2	2012 DR32	41 m	< 10 LD Feb. 28, uncertainty +/- 4.1333 hours
8.34 LD March 16	1998 SL36	309 m	< 10 LD March 14
7.63 LD March 26	2015 TC25	4 m	< 10 LD March 17, radar/NHATS target, risk
4.57 LD April 19	2014 JO25	812 m	< 10 LD April 18
8.1 LD May 29	2017 CS	447 m	< 10 LD May 26, uncertainty +/- 2.6167 hours, risk - DOU

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center. This puts a focus on some of the most important and very best NEO observation work, representative of the much larger NEO discovery and tracking effort. Object distances are derived by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity on 6 February '17

The MPC's NEO Confirmation Page has 79 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 79 objects listed. Of these, 42 were "one nighters." So far The Tracking News has counted a total of 91 listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs on 6 February '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2017-C65 time-stamped "03:33 UT" - 2015 EN7 - see below
MPEC 2017-C66 time-stamped "11:32 UT" - 2005 QB5 - see below
MPEC 2017-C67 time-stamped "13:05 UT" - Daily Orbit Update - see below
MPEC 2017-C68 time-stamped "18:53 UT" - 2017 CW1 - see below
MPEC 2017-C69 time-stamped "18:57 UT" - 2017 CX1

MPEC 2017-C69 - "18:57 UT" - 2017 CX1

K17C01X 2017 CX1 (Earth MOID=3.6 LD, H=28.2 ~8m) was picked up at 0741 UT on 5 Feb. by the Mt. Lemmon Survey (MLS), observing it at Feb. 5.32-33p4, 5.38-44p12, and 6.42p3. This detection was confirmed by Magdalena Ridge Obs. (MRO) (Feb. 5.36-38p4), Sergio Foglia via iTelescope Obs. Siding Spring (Feb. 5.60-62p3), Great Shefford Obs. (Feb. 5.88-90p3), and Sandlot Obs. (Feb. 6.25-27p3).

MPEC 2017-C68 - "18:53 UT" - 2017 CW1

K17C01W 2017 CW1 (H=21.1 ~204m) was picked up at 0512 UT on 2 Feb. by MLS, observing it at Feb. 2.22-33p14 at V=20.1-22.2 and 3.14-15p3 at V=20.7-9. This detection was confirmed by Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Feb. 3.04-05p3, 5.07-08p3 & 6.08-09p3), Steward Obs. Mt. Lemmon Station (Feb. 3.19-20p3), and the Spacewatch 1.8m telescope (Feb. 5.13-14p2).

<< DOU on 6 Feb. '17 >> MPEC 2017-C67 - "13:05 UT" - Daily Orbit Update

Observations of risk-listed objects
K17C00S 2017 CS (Q=4.183 AU, arc=16 days, H=19.3 ~467m, close passer) from the Spacewatch 0.9m telescope (Feb. 5.32-36p3) and Foglia/iTelObs-SSO (Feb. 5.57-63p3)
K17B30W 2017 BW30 (small asteroid, arc=9 days, H=23.8 ~59m) from Holmes/CTIO (Feb. 6.16-17p3)
K17B30L 2017 BL30 (small asteroid, arc=9 days, H=23.3 ~74m, NHATS target) from Steven M. Tilley via iTelescope Obs. Nerpio (Feb. 1.14-16p2), Astronomical Research Obs. Westfield (Feb. 4.31p3), M. Kumrucu-Lohmiller via Slooh.com Canary Islands Obs. (Feb. 5.08-09p3), Spacewatch 0.9m (Feb. 5.17-18p3), iTelescope Obs. Mayhill (Feb. 5.21-23p2), Foglia/iTelObs-SSO (Feb. 5.55-58p2), and Great Shefford Obs. (Feb. 5.93-94p3)
Observations of recently (no longer) risk-listed objects
K17B31P 2017 BP31 (arc=8 days, H=19.7 ~389m) from ARO Westfield (Feb. 4.45p3)
K17B03L 2017 BL3 (arc=44 days, H=20.4 ~282m) from RMS Obs. (Feb. 2.43-45p2 & 4.08-13p3) and ARO Westfield (Feb. 4.32p3)
Observations of close-passing objects
K17B93M 2017 BM93 (arc=7 days, H=26.5 ~17m) from ARO Westfield (Feb. 4.18p3)
K17B92N 2017 BN92 (arc=4 days, H=25.7 ~25m) from RMS Obs. (Feb. 4.17-18p2 & 4.22p1)
K17B30Q 2017 BQ30 (arc=9 days, H=25.4 ~28m) from Holmes/CTIO (Feb. 6.18-19p3)
K17B06Q 2017 BQ6 (arc=10 days, H=21.4 ~178m) from RMS Obs. (Feb. 4.13-14p11), Great Shefford Obs. (Feb. 5.79p4), and North Obs. (Feb. 5.92p3)
K17B00Y 2017 BY (arc=17 days, H=25.5 ~27m, NHATS target) from Holmes/CTIO (Feb. 6.14-15p3)
K17B00W 2017 BW (arc=17 days, H=23.4 ~71m, NHATS target, radar support) from ARO Westfield (Feb. 4.33p4) and Foglia/iTelObs-SSO (Feb. 5.56-59p2)
Observation campaigns (NHATS targets, radar support)
K17B93V 2017 BV93 (arc=4 days, H=24.9 ~35m, NHATS) from ARO Westfield (Feb. 4.43p3)
K17B32N 2017 BN32 (arc=6 days, H=24.8 ~37m, NHATS) from ARO Westfield (Feb. 4.42p4)
K17B30P 2017 BP30 (arc=7 days, H=26.0 ~21m, NHATS) from ARO Westfield (Feb. 4.23-24p3)
K17B29F 2017 BF29 (arc=11 days, H=25.6 ~26m, NHATS) from Holmes/CTIO (Feb. 6.21p3)
K17B06L 2017 BL6 (arc=10 days, H=21.1 ~204m, NHATS) from ARO Westfield (Feb. 4.14-15p3)
K17B03M 2017 BM3 (arc=21 days, H=23.0 ~85m, NHATS) from RMS Obs. (Jan. 28.41p1, Feb. 4.05p2 & 4.11-14p2)
K15Bo9N 2015 BN509 (arc=4 opp, H=20.7 ~245m, radar) from Castelmartini Obs. (Jan. 27.15p3)
K15B04G 2015 BG4 (arc=2 opp, H=26.3 ~19m, NHATS) from MLS (Feb. 5.30-31p4)
Q5482 265482 2005 EE (NHATS, radar) from ATLAS Haleakala (Feb. 5.46-52p4)
96590 96590 1998 XB (radar) from ARO Westfield (Feb. 4.01p5)
85990 85990 1999 JV6 (NHATS, radar) from RMS Obs. (Feb. 3.03-04p2, 4.03p1 & 4.09-12p2)
11398 11398 1998 YP11 (radar) from Castelmartini Obs. (Jan. 27.11p3)
04179 4179 Toutatis (1989 AC) (radar) from ATLAS Haleakala (Feb. 5.29-33p4)
04055 4055 Magellan (1985 DO2) (radar) from Castelmartini Obs. (Jan. 27.14p2)
01864 1864 Daedalus (1971 FA) (radar) from Castelmartini Obs. (Jan. 27.22p3)
-- NHATS target table & ephemerides -- Planetary radar schedules: Arecibo & Goldstone
Observations of small asteroids (H>22.0)
K17C01M 2017 CM1 (arc=3 days, H=25.8 ~23m) from Holmes/CTIO (Feb. 5.30-31p3)
K17BC3M 2017 BM123 (arc=5 days, H=23.6 ~65m) from Spacewatch 0.9m (Feb. 5.32-36p3)
K17B93U 2017 BU93 (arc=8 days, H=23.1 ~81m) from Holmes/CTIO (Feb. 6.13-14p3)
K17B92M 2017 BM92 (arc=7 days, H=23.8 ~59m) from Holmes/CTIO (Feb. 6.18-19p3)
K17B32X 2017 BX32 (arc=7 days, H=23.8 ~59m) from Holmes/CTIO (Feb. 5.25-26p3)
K17B32T 2017 BT32 (arc=9 days, H=23.7 ~62m) from Holmes/CTIO (Feb. 5.24-25p3)
K17B06X 2017 BX6 (arc=9 days, H=24.2 ~49m) from ARO Westfield (Feb. 4.39-40p5)
K17B06V 2017 BV6 (arc=11 days, H=22.6 ~102m) from Holmes/CTIO (Feb. 6.16-17p3)
K17B05Z 2017 BZ5 (arc=10 days, H=22.3 ~117m) from ARO Westfield (Feb. 4.25-26p4)
K16Y08Q 2016 YQ8 (arc=43 days, H=22.8 ~93m) from MLS (Feb. 5.28-30p4)
Observations of other objects
K17C00Q 2017 CQ (arc=4 days, H=20.8 ~234m) from MLS (Feb. 5.35-36p3)
K17B92K 2017 BK92 (arc=5 days, H=20.6 ~257m) from ARO Westfield (Feb. 4.27-28p3)
K17B32L 2017 BL32 (arc=8 days, H=20.4 ~282m) from Holmes/CTIO (Feb. 6.12-13p3)
K17B31U 2017 BU31 (arc=9 days, H=20.5 ~269m) from Holmes/CTIO (Feb. 6.15-16p3)
K17B31R 2017 BR31 (arc=9 days, H=21.3 ~186m) from Holmes/CTIO (Feb. 6.05-06p3)
K17B31Q 2017 BQ31 (arc=7 days, H=20.6 ~257m) from ARO Westfield (Feb. 4.20-21p5)
K17B30D 2017 BD30 (q=0.372 AU, arc=10 days, H=21.7 ~155m) from Holmes/CTIO (Feb. 6.11-12p3)
K17B30C 2017 BC30 (arc=11 days, H=21.2 ~195m) from Holmes/CTIO (Feb. 6.21p3)
K17B03O 2017 BO3 (arc=12 days, H=21.2 ~195m) from ARO Westfield (Feb. 4.44p3)
K17A20P 2017 AP20 (Q=4.997 AU, arc=22 days, H=17.8 ~933m) from ARO Westfield (Feb. 4.46p3)
K17A13H 2017 AH13 (arc=32 days, H=21.1 ~204m) from ARO Westfield (Feb. 4.34-35p3) and MLS (Feb. 5.32p4)
K17A05F 2017 AF5 (q=0.125 AU, Q=4.834 AU, arc=31 days, H=17.8 ~933m) from Castelmartini Obs. (Jan. 27.06p3) and ARO Westfield (Feb. 4.30p3)
K16Y04N 2016 YN4 (Q=4.203 AU, arc=43 days, H=19.7 ~389m) from MLS (Feb. 5.23-24p4)
K16Y00N 2016 YN (i=45.0°, arc=2 opp, H=18.3 ~741m) from ARO Westfield (Feb. 4.03-04p3)
K16U80U 2016 UU80 (arc=98 days, H=20.8 ~234m) from ARO Westfield (Feb. 4.19-20p5)
K16P66Z 2016 PZ66 (arc=175 days, H=19.3 ~467m) from ARO Westfield (Feb. 4.11-12p3)
K16N00V 2016 NV (arc=216 days, H=19.8 ~371m) from ARO Westfield (Feb. 4.05-07p3)
K14K76U 2014 KU76 (arc=2 opp, H=20.5 ~269m) from MLS (Feb. 5.34-35p4)
K13A60W 2013 AW60 (arc=3 opp, H=18.8 ~589m) from Ovidiu Vaduvescu via La Palma (2014 May 27.16-17p5)
K08S00D 2008 SD (arc=2 opp, H=19.5 ~426m) from Great Shefford Obs. (Feb. 5.91-92p3)
K07VI4M 2007 VM184 (arc=2 opp, H=20.9 ~224m) from Castelmartini Obs. (Dec. 6.73-74p3)
K03U22F 2003 UF22 (arc=3 opp, H=20.1 ~323m) from MLS (Feb. 5.28-30p4)
K03C01R 2003 CR1 (arc=4 opp, H=20.1 ~323m) from Castelmartini Obs. (Jan. 27.19-20p3)
K01Q34B 2001 QB34 (arc=2 opp, H=19.5 ~426m) from Vaduvescu/La Palma (2014 May 27.19-20p5)
m1904 481904 2009 BB11 from Castelmartini Obs. (Jan. 27.08p3) and ATLAS Haleakala (Feb. 5.41-45p4)
m1543 481543 2007 RN7 from MLS (Feb. 5.32p4)
l5665 475665 2006 VY13 from Castelmartini Obs. (Jan. 27.21-22p3)
h8955 438955 2010 LN14 from Castelmartini Obs. (Jan. 27.09-10p3), Squirrel Valley Obs. (Feb. 5.15-18p4), and ATLAS Haleakala (Feb. 5.39-43p4)
b0307 370307 2002 RH52 from Castelmartini Obs. (Jan. 27.23p3)
V0842 310842 2003 AK18 from Castelmartini Obs. (Jan. 27.12p2)
F3951 153951 2002 AC3 from Castelmartini Obs. (Jan. 27.11-12p3)
F2667 152667 1998 FR11 from Pan-STARRS 1 (PS1) (Feb. 5.65-66p4)
E3947 143947 2003 YQ117 from MLS (Feb. 5.31-36p4)
36017 36017 1999 ND43 from MLS (Feb. 5.30-31p3)
25916 25916 2001 CP44 from Castelmartini Obs. (Jan. 27.07p2)
13651 13651 1997 BR from ATLAS Haleakala (Feb. 5.35-38p4)
10165 10165 1995 BL2 from MLS (Feb. 5.32p4)
05693 5693 1993 EA from ATLAS Haleakala (Feb. 5.37-42p4)
03103 3103 Eger (1982 BB) from Castelmartini Obs. (Jan. 27.12p3), ATLAS Haleakala (Feb. 5.44-49p4), and ISON New Mexico Obs. (Feb. 6.29-30p3)
01627 1627 Ivar (1929 SH) from ATLAS Haleakala (Feb. 5.31-35p5)
00887 887 Alinda (1918 DB) from ATLAS Haleakala (Feb. 4.23-26p4)
00433 433 Eros (1898 DQ) from RMS Obs. (Feb. 4.01-02p2)

MPEC 2017-C66 - "11:32 UT" - 2005 QB5

K05Q05B 2005 QB5 (small asteroid, Earth MOID=6.4 LD, H=23.7 ~62m) from PS1 (Feb. 4.57-61p3) and Holmes/CTIO (Feb. 6.27-28p3)

MPEC 2017-C65 - "03:33 UT" - 2015 EN7

K15E07N 2015 EN7 (i=45.0°, H=20.2 ~309m) from PS1 (Feb. 4.58-61p4 at w=21.9-22.4) and LCOGT Cerro Tololo B (Feb. 5.21-23p3)

Observers on 6 February '17

A total of 22 observers appear in today's MPECs.

Code	Observer / observatory
`H21`	Astronomical Research Obs. Westfield in Illinois, 22 in MPEC 2017-C67 -- 2017 BZ5, 2017 BX6, 2017 BW, 2017 BV93, 2017 BQ31, 2017 BP31, 2017 BP30, 2017 BO3, 2017 BN32, 2017 BM93, 2017 BL6, 2017 BL30, 2017 BL3, 2017 BK92, 2017 AP20, 2017 AH13, 2017 AF5, 2016 YN, 2016 UU80, 2016 PZ66, 2016 NV, 96590
`T05`	ATLAS Haleakala in Hawaii, 9 in MPEC 2017-C67 -- 481904, 438955, 265482, 13651, 5693, 4179, 3103, 1627, 887
`160`	Castelmartini Obs. in Italy, 15 in MPEC 2017-C67 -- 2017 AF5, 2015 BN509, 2007 VM184, 2003 CR1, 481904, 475665, 438955, 370307, 310842, 25916, 153951, 11398, 4055, 3103, 1864
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 17 in MPECs 2017-C66, 2017-C67 & 2017-C68 -- 2017 CW1, 2017 CM1, 2017 BY, 2017 BX32, 2017 BW30, 2017 BV6, 2017 BU93, 2017 BU31, 2017 BT32, 2017 BR31, 2017 BQ30, 2017 BM92, 2017 BL32, 2017 BF29, 2017 BD30, 2017 BC30, 2005 QB5
`J95`	Great Shefford Obs. in England, 4 in MPECs 2017-C67 & 2017-C69 -- 2017 CX1, 2017 BQ6, 2017 BL30, 2008 SD
`H15`	ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-C67 -- 3103
`H06`	iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-C67 -- 2017 BL30
`I89'`	Steven M. Tilley in Louisiana via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2017-C67 -- 2017 BL30
`Q62\|`	Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 4 in MPECs 2017-C67 & 2017-C69 -- 2017 CX1, 2017 CS, 2017 BW, 2017 BL30
`950.`	Ovidiu Vaduvescu via La Palma in the Canary Islands, 2 in MPEC 2017-C67 -- 2013 AW60, 2001 QB34
`W86`	LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-C65 -- 2015 EN7
`H01`	Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-C69 -- 2017 CX1
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 13 in MPECs 2017-C67, 2017-C68 & 2017-C69 -- 2017 CX1, 2017 CW1, 2017 CQ, 2017 AH13, 2016 YQ8, 2016 YN4, 2015 BG4, 2014 KU76, 2003 UF22, 481543, 36017, 143947, 10165
`J69`	North Obs. in England, 1 in MPEC 2017-C67 -- 2017 BQ6
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2017-C65, 2017-C66 & 2017-C67 -- 2015 EN7, 2005 QB5, 152667
`W25`	RMS Obs., 6 in MPEC 2017-C67 -- 2017 BQ6, 2017 BN92, 2017 BM3, 2017 BL3, 85990, 433
`H36`	Sandlot Obs. in Kansas, 1 in MPEC 2017-C69 -- 2017 CX1
`G40!`	M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-C67 -- 2017 BL30
`691`	Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2017-C67 -- 2017 CS, 2017 BM123, 2017 BL30
`291`	Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-C68 -- 2017 CW1
`W34`	Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-C67 -- 438955
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-C68 -- 2017 CW1

For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring on 6 February '17

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON2 risk pages.
0000NNN000 Object	Risk Monitor	When Noted UTC	0000T0000 Year Range	VI #	000NN00 Prob Cum	T0000 PS Cum	T0000 PS Max	T S	Notes for Today's Latest Risk Assessments

2017 CH1	NEODyS	1644	2037-2104	12	1.34e-06	-2.34	-2.77	0	NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2017-01-15.641 to 2017-02-05.437."

2017 CS	JPL Sentry	1730	R E M O V E D						JPL: Risk listing removed at 1700 UTC.
2017 CS	NEODyS	1644	2059	1	1.08e-10	-7.33	-7.33	0	NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2017-01-20.570 to 2017-02-05.630."

2017 BY93	NEODyS	1644	2046-2096	22	3.01e-06	-4.30	-4.69	0	NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2017-01-26.500 to 2017-02-05.366."

2017 BO32	NEODyS	1644	2030-2112	86	9.85e-06	-4.98	-5.65	0	NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2017-01-29.398 to 2017-02-05.104."

2017 BW30	NEODyS	1644	2074-2115	9	1.49e-08	-7.51	-7.95	0	NEODyS: "Based on 51 optical observations (of which 1 are rejected as outliers) from 2017-01-28.542 to 2017-02-06.173."

2017 BL30	JPL Sentry	1644	2029-2071	9	9.8e-04	-1.76	-1.76	1	JPL: "Analysis based on 103 observations spanning 8.5596 days (2017-Jan-28.37792 to 2017-Feb-05.93753)." Diameter approximately 0.072 km. from mean, weighted H=23.4.
2017 BL30	NEODyS	1644	2029-2115	29	1.03e-03	-1.73	-1.73	1	NEODyS: "Based on 103 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-05.938."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology on 6 February '17

Times are UTC for when items were noted or added by The Tracking News.

2112	Generated Traffic Report
1900	Grabbed MPEC 2017-C68 - 2017 CW1 - see above Grabbed MPEC 2017-C69 - 2017 CX1 - see above
1730	Noted that JPL Sentry has removed 2017 CS as an impact risk - see above
1644	Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above Noted that NEODyS has updated its 2017 BL30 risk assessment - see above Noted that NEODyS has updated its 2017 BO32 risk assessment - see above Noted that NEODyS has updated its 2017 BW30 risk assessment - see above Noted that NEODyS has updated its 2017 BY93 risk assessment - see above Noted that NEODyS has posted 2017 CH1 as an impact risk - see above Noted that NEODyS has updated its 2017 CS risk assessment - see above Grabbed MPEC 2017-C65 - 2015 EN7 - see above Grabbed MPEC 2017-C66 - 2005 QB5 - see above Grabbed MPEC 2017-C67 - Daily Orbit Update - see above

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