Contents  on 11 July '19

NOTE:  These A/CC news pages will update less often for an extended period. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP objects, and there may be some days without a traffic report for Earth's Busy Neighborhood.

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed 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 11 July '19

Ten objects reported inside ten LD

Ten asteroidal objects are reported inside ten lunar distances (LD) of Earth today. The two closest both leave our planet's SOI. Intruder 2019 NN3 moves outward from 1.04 to 2.72 LD and 2019 NM5 from 2.25 to 3.43 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
0.82 LD July 9 2019 MB4 21 m  2.81 to 4.35 LD July 2 - 15 intruder - DOU
0.83 LD yesterday 2019 NN3 39 m  1.04 to 2.72 LD July 5 - 15 intruder, exits Earth SOI
1.58 LD July 5 2019 NX1 10 m  9.89 to 11.81 LD June 30 - today exits ten LD
2.12 LD yesterday 2019 NM5 13 m  2.25 to 3.43 LD July 5 - 15 exits Earth SOI - DOU
2.6   LD July 9* 2019 NX5 5 m  2.7 to 2.8 LD June 13 - Aug. 4 NEW, EPU +/- 21 mins.*, risk - MPEC
4.35 LD July 8 2019 MT2 18 m  7.47 to 9.60 LD July 4 - 12 risk
5.57 LD July 9 2019 NP5 10 m  5.67 to 5.98 LD July 2 - 17 risk
7.82 LD July 13 2019 MW1 43 m  8.13 from 8.84 LD July 9 - 16
8.01 LD July 9 2016 NO56 24 m  8.80 to 10.13 LD July 7 - 11 exits ten LD
8.97 LD yesterday 2019 NM4 56 m  9.11 to 9.59 LD July 7 - 12
Approaching
6.6   LD July 29* 2019 NN4 26 m  15.7 from 16.4 LD July 20 - Aug. 6 EPU +/- 13 mins.*, NHATS target
* EPU = Earth passage uncertainty

This report was generated at 2010 UTC with the discovery of outbound risk-listed 2019 NX5 (MPEC) and with follow-up in today's DOU MPEC for outbound objects 2019 NM5 and intruder 2019 MB4, departed objects 2019 NQ, 2019 MT, 441987 2010 NY65, and risk-listed 2019 NL4, and distant 2016 OF, plus observations from their discovery years for fourteen other objects.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's 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 temporal distances are derived by A/CC from JPL Horizons data. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 11 July '19

The MPC's NEO Confirmation Page has 31 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 31 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 51 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 11 July '19

Minor Planet Electronic Circulars

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


MPEC 2019-N146 - "23:09 UT" - 2019 NJ6


MPEC 2019-N145 - "22:07 UT" - 2019 NH6


MPEC 2019-N144 - "16:28 UT" - 2019 NG6


MPEC 2019-N143 - "16:27 UT" - 2019 NF6


MPEC 2019-N142 - "14:29 UT" - 2018 PY31


MPEC 2019-N141 - "12:35 UT" - 2019 NY5


MPEC 2019-N140 - "12:30 UT" - 2019 NX5


MPEC 2019-N139 - "12:25 UT" - 2019 NW5


<< DOU on 11 July '19 >>  MPEC 2019-N138 - "12:03 UT" - Daily Orbit Update

Observers  on 11 July '19

A total of 35 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPECs 2019-N138, 2019-N139 & 2019-N144 -- 2019 NW5, 2019 NQ, 2019 NG6, 2019 MV1, 2019 MT, 2019 LY5, 2019 HC, 2017 XD62, 2004 RO111, 2002 LE31, 368790
160Castelmartini Obs. in Italy, 1 in MPEC 2019-N139 -- 2019 NW5
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2019-N143 -- 2019 NF6
W84!program code "!" (10) via DECam in Chile, 2 in MPEC 2019-N138 -- 2005 NE21, 468540
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2019-N138 -- 2016 GS134
J27El Guijo Obs. in Spain, 2 in MPEC 2019-N138 -- 68950, 12538
734Farpoint Obs. in Kansas, 1 in MPEC 2019-N139 -- 2019 NW5
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-N139 -- 2019 NW5
K88GINOP-KHK in Hungary, 2 in MPECs 2019-N139 & 2019-N140 -- 2019 NX5, 2019 NW5
J95Great Shefford Obs. in England, 1 in MPEC 2019-N138 -- 2019 ML3
W93Korea Microlensing Telescope Network CTIO in Chile, 1 in MPEC 2019-N142 -- 2018 PY31
L32Korea Microlensing Telescope Network SAAO in South Africa, 1 in MPEC 2019-N142 -- 2018 PY31
Z43Landehen Obs., 1 in MPEC 2019-N138 -- 2019 MB4
K91LCO Sutherland A in South Africa, 1 in MPEC 2019-N138 -- 2019 MA2
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2019-N139, 2019-N140, 2019-N141 & 2019-N144 -- 2019 NY5, 2019 NX5, 2019 NW5, 2019 NG6
568^R. Wainscoat on Mauna Kea in Hawaii, 3 in MPECs 2019-N143, 2019-N145 & 2019-N146 -- 2019 NJ6, 2019 NH6, 2019 NF6
V01Mountainville Obs. in Utah, 2 in MPECs 2019-N138 & 2019-N139 -- 2019 NW5, 2019 NE2
474Mt. John Obs. in New Zealand, 1 in MPEC 2019-N143 -- 2019 NF6
G96Mt. Lemmon Survey (MLS) in Arizona, 46 in MPECs 2019-N138 & 2019-N141 -- 2019 NY5, 2019 MV1, 2019 MF1, 2019 JX6, 2018 YU, 2018 NJ4, 2018 MR8, 2018 LM4, 2017 XD62, 2016 OF, 2014 QO296, 2012 QH8, 2012 PW, 2012 PG6, 2005 UC, 2005 LW39, 87025, 85709, 68950, 514597, 470951, 467475, 455322, 441987, 409934, 408869, 370307, 367525, 366733, 357022, 355256, 341816, 334412, 326777, 277142, 243025, 228502, 183548, 162181, 162162, 159609, 159454, 143527, 139211, 108906, 5879
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 1 in MPEC 2019-N138 -- 381677
J69North Obs. in England, 1 in MPEC 2019-N138 -- 2019 NM5
F51Pan-STARRS 1 (PS1) in Hawaii, 43 in MPECs 2019-N138, 2019-N142, 2019-N143, 2019-N144, 2019-N145 & 2019-N146 -- 2019 NJ6, 2019 NH6, 2019 NG6, 2019 NF6, 2018 PY31, 2016 NL15, 2015 MO11, 2015 HG182, 2015 FT344, 2015 DO224, 2015 BT516, 2015 BB, 2014 XG32, 2014 WS7, 2014 WN69, 2014 TN, 2014 OV299, 2014 OR392, 2014 KO2, 2014 HP197, 2014 GU34, 2014 GS1, 2014 CB13, 2013 XT21, 2013 UO5, 2013 TQ4, 2013 JR7, 2013 GW38, 2013 GT66, 2013 EB, 2013 BQ27, 2012 CP2, 2010 MS1, 2007 YB2, 1996 AE2, 65733, 482650, 401857, 331471, 31669, 152754, 8037, 4197
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2019-N142 -- 2018 PY31
K63Pascoli Obs. in Italy, 1 in MPEC 2019-N139 -- 2019 NW5
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2019-N144 -- 2019 NG6
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2019-N138 -- 481984, 12538, 5626, 887
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2019-N138, 2019-N139 & 2019-N141 -- 2019 NY5, 2019 NW5, 2016 NJ33
C95SATINO-1 in France, 1 in MPEC 2019-N138 -- 2019 MT
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2019-N138 -- 2019 NL4
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2019-N146 -- 2019 NJ6
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2019-N139 -- 2019 NW5
I52Steward Obs. Mt. Lemmon Station in Arizona, 6 in MPECs 2019-N138, 2019-N139, 2019-N140, 2019-N141 & 2019-N144 -- 2019 NY5, 2019 NX5, 2019 NW5, 2019 NG6, 2019 JY4, 2019 HC
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-N138 -- 2019 DZ1
L01Visnjan Obs., 3 in MPECs 2019-N139, 2019-N141 & 2019-N144 -- 2019 NY5, 2019 NW5, 2019 NG6
C51WISE in Earth polar orbit, 2 in MPEC 2019-N138 -- 2015 AP43, 12538
I41Zwicky Transient Facility (ZTF) in southern California, 7 in MPECs 2019-N138, 2019-N139 & 2019-N140 -- 2019 NX5, 2019 NW5, 2019 MW, 468741, 442177, 244670, 101873
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 July '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS 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 and NEODyS listings is 100 years, and both post impact solutions beyond that for some special objects.
For the latest official risk assessments, and for explanations of the terminology, see the NASA/JPL 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
2019 NX5NEODyS22312070-210777.23e-06-7.51-7.560NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2019-07-10.362 to 2019-07-11.352."
JPL Sentry15352069-2115113.39755e-05-6.87-7.060JPL: Computed at 08:09 today Pacific time based on 20 observations spanning .98977 days (2019-Jul-10.361415 to 2019-Jul-11.351181). Diameter approximately 0.005 km. from weighted mean H=29.28.
2019 NL4NEODyS2231R E M O V E D-
JPL Sentry14402074-207418.044e-08-7.58-7.580JPL: Computed at 06:51 today Pacific time based on 17 observations spanning 5.7993 days (2019-Jul-04.568095 to 2019-Jul-10.36744). Diameter approximately 0.021 km. from weighted mean H=26.07.
2016 GS134NEODyS2231R E M O V E D-
JPL Sentry14402054-207022.7352e-07-7.87-8.010JPL: Computed at 06:51 today Pacific time based on 27 observations spanning 28.795 days (2016-Apr-02.42225 to 2016-May-01.21745). Diameter approximately 0.010 km. from weighted mean H=27.75.
2013 GW38NEODyS22312061-210448.37e-07-7.85-8.220NEODyS: "Based on 20 optical observations (of which 2 are rejected as outliers) from 2013-04-08.425 to 2013-04-12.537."
JPL Sentry14402070-2118102.133562e-06-7.48-7.720JPL: Computed at 06:32 today Pacific time based on 19 observations spanning 2.3696 days (2013-Apr-08.423767 to 2013-Apr-10.79339). Diameter approximately 0.007 km. from weighted mean H=28.44.

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 11 July '19

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

2331Grabbed MPEC 2019-N146 - 2019 NJ6 - see above
2231Noted that NEODyS has updated its 2013 GW38 risk assessment - see above
Noted that NEODyS has removed 2016 GS134 as an impact risk - see above
Noted that NEODyS has removed 2019 NL4 as an impact risk - see above
Noted that NEODyS has posted 2019 NX5 as an impact risk - see above
Grabbed MPEC 2019-N145 - 2019 NH6 - see above
2010Generated Traffic Report
1639Grabbed MPEC 2019-N143 - 2019 NF6 - see above
Grabbed MPEC 2019-N144 - 2019 NG6 - see above
1535Noted that JPL Sentry has posted 2019 NX5 as an impact risk - see above
1440Noted that JPL Sentry has updated its 2013 GW38 risk assessment - see above
Noted that JPL Sentry has updated its 2016 GS134 risk assessment - see above
Noted that JPL Sentry has updated its 2019 NL4 risk assessment - see above
Grabbed MPEC 2019-N138 - Daily Orbit Update - see above
Grabbed MPEC 2019-N139 - 2019 NW5 - see above
Grabbed MPEC 2019-N140 - 2019 NX5 - see above
Grabbed MPEC 2019-N141 - 2019 NY5 - see above
Grabbed MPEC 2019-N142 - 2018 PY31 - see above