Contents  on 17 April '19

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 17 April '19

Seven objects reported inside ten LD

Seven transient natural objects are reported to be less than ten lunar distances (LD) from Earth today. Nearest is risk-listed 2019 GC6, which enters the Earth-Moon system as it comes in from 1.66 to 0.66 LD, passing the Moon by 0.72 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
0.57 LD tomorrow 2019 GC6 17 m  0.66 from 1.66 LD April 10 - 26 intruder today, NHATS target, Moon
closest 0.72 LD at 1322 UTC, risk
1.70 LD April 11 2019 GV5 5 m  4.86 to 5.66 LD March 31 - April 23 NHATS target
3.39 LD yesterday 2019 GW20 11 m  3.80 to 5.85 LD April 13 - 19
3.86 LD April 11 2019 GE1 12 m  8.42 to 9.75 LD April 5 - 18 NHATS target
4.04 LD tomorrow 2019 FN2 62 m  4.23 from 5.03 LD April 13 - 24 NHATS target
4.69 LD April 27 2019 GF1 10 m  6.16 from 6.45 LD April 7 - May 19 NHATS target
5.48 LD April 11 2019 GP19 16 m  7.65 to 8.32 LD April 1 - 20 NHATS target

This report was generated at 1942 UTC with follow-up in today's DOU MPEC for departed objects 2019 GW1 and risk-listed 2019 GS19, and for distant 68216 2001 CV26.

Approaching - sorted by 10-LD bubble entry date
9.09 LD April 23 2019 GM4 68 m  13.73 from 15.21 LD April 21 - 25
7.2   LD April 28* 2019 GX5 24 m  25.9 from 28.3 LD April 25 - May 1 EPU +/- 15 mins.*
6.1   LD May 17* 2019 GT1 35 m  25.9 from 26.6 LD May 8 - 26 EPU +/- 43 mins.*, NHATS target
* EPU = Earth passage uncertainty



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. "Distant" is used here to describe an object that has approached Earth within ten LD since A/CC began these traffic reports twelve years ago but is not currently coming so close. Object temporal 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 17 April '19

The MPC's NEO Confirmation Page has 42 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 42 objects listed. Of these, nineteen were "one nighters."

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 17 April '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.


<< DOU on 17 Apr. '19 >>  MPEC 2019-H13 - "12:07 UT" - Daily Orbit Update


MPEC 2019-H12 - "03:15 UT" - 2007 TS68


MPEC 2019-H11 - "03:10 UT" - 2007 DX60


MPEC 2019-H10 - "02:21 UT" - 97 New Distant Objects


MPEC 2019-H09 - "00:52 UT" - 2016 SE56


MPEC 2019-H08 - "00:48 UT" - 2015 XW379


MPEC 2019-H07 - "00:43 UT" - 2015 KK178 = 2015 MA150


MPEC 2019-H06 - "00:40 UT" - 2015 KG178


MPEC 2019-H05 - "00:35 UT" - 2011 GZ61

Observers  on 17 April '19

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 9 in MPEC 2019-H13 -- 2019 CH, 68216, 6178, 5693, 3199, 1685, 1620, 1036, 433
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2019-H13 -- 2019 GL, 2019 GD, 2019 FY, 2019 FG1, 2019 EC2, 2019 CH, 2019 AP3, 523603, 138095, 5332, 4581
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPEC 2019-H13 -- 2019 GW1, 2018 XV
W84!program code "!" (10) via DECam in Chile, 2 in MPEC 2019-H10 -- 2013 PD84, 2010 PC88
W845Lori Allen via DECam in Chile, 1 in MPEC 2019-H10 -- 2010 NG146
595Farra d'Isonzo Obs. in Italy, 2 in MPEC 2019-H13 -- 2019 FP2, 2014 HD177
238Grorudalen Obs. in Norway, 1 in MPEC 2019-H13 -- 5131
240Herrenberg Obs. in Germany, 4 in MPEC 2019-H13 -- 453778, 387733, 18736, 144898
246KLENOT in the Czech Republic, 2 in MPEC 2019-H13 -- 2014 LJ21, 2002 GA
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2019-H12 -- 2007 TS68
C653program code 3 via Montsec Obs. in Spain, 1 in MPEC 2019-H13 -- 2019 GD1
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2019-H11, 2019-H12 & 2019-H13 -- 2018 JS2, 2007 TS68, 2007 DX60
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2019-H13 -- 2016 GW221
F51Pan-STARRS 1 (PS1) in Hawaii, 105 in MPECs 2019-H05, 2019-H06, 2019-H07, 2019-H08, 2019-H09, 2019-H10, 2019-H11, 2019-H12 & 2019-H13 -- 2018 JS2, 2016 SE56, 2016 NZ90, 2016 AN278, 2015 XW379, 2015 KK178, 2015 KG178, 2015 DZ250, 2015 BG568, 2015 BF568, 2015 BE568, 2015 AR293, 2015 AQ293, 2014 WZ535, 2014 WY535, 2014 WX535, 2014 WW535, 2014 WV535, 2014 WC536, 2014 WB536, 2014 WA536, 2014 SA365, 2014 PM82, 2014 OX415, 2014 KF113, 2014 KE113, 2014 JR92, 2014 JQ92, 2014 HO211, 2014 GK65, 2014 GJ65, 2014 BF70, 2014 BE70, 2014 BD70, 2014 AF61, 2013 PE84, 2013 PD84, 2013 NU33, 2013 NT33, 2013 ME14, 2013 LZ36, 2013 GW141, 2013 CF229, 2012 YG12, 2012 YF12, 2012 XW159, 2012 WD37, 2012 VB116, 2012 UE185, 2012 UD185, 2012 PV45, 2012 PU45, 2012 LB27, 2012 JD68, 2012 HX87, 2012 HW87, 2012 GT41, 2012 FN87, 2012 FM87, 2012 DQ106, 2012 BZ159, 2012 AZ25, 2011 VZ24, 2011 SW281, 2011 QY100, 2011 OC61, 2011 MV11, 2011 LJ29, 2011 HN104, 2011 GZ61, 2011 EZ90, 2011 EY90, 2011 BQ170, 2011 BP170, 2011 BO170, 2011 BN170, 2011 BM170, 2010 WN75, 2010 WM75, 2010 UU110, 2010 TT195, 2010 TS195, 2010 TR195, 2010 RK190, 2010 RJ190, 2010 QQ7, 2010 PC88, 2010 OE153, 2010 NG146, 2010 NF146, 2010 JJ210, 2010 JH210, 2010 JG210, 2010 JF210, 2010 DF106, 2010 CD270, 2010 BP153, 2010 AW153, 2010 AV153, 2009 YT26, 2009 YS26, 2009 YR26, 2009 XM26, 2007 TS68, 2007 DX60
C95SATINO-1 in France, 1 in MPEC 2019-H13 -- 2019 CH
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2019-H13 -- 2019 GS19
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2019-H13 -- 2019 GM
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-H13 -- 1999 NW2
I41Zwicky Transient Facility in southern California, 1 in MPEC 2019-H13 -- 455736
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 April '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 GS19JPL Sentry17302102-210211.512e-07-7.27-7.270JPL: Computed at 08:10 today Pacific time based on 50 observations spanning 4.8914 days (2019-Apr-11.38728 to 2019-Apr-16.27868). Diameter approximately 0.026 km. from weighted mean H=25.60.
NEODyS17302069-210221.35e-07-7.27-7.330NEODyS: "Based on 52 optical observations (of which 4 are rejected as outliers) from 2019-04-11.388 to 2019-04-16.279."
2019 GC6JPL Sentry23042113-211311.104e-07-8.15-8.150JPL: Computed at 16:03 today Pacific time based on 90 observations spanning 17.397 days (2019-Mar-31.33428 to 2019-Apr-17.731084). Diameter approximately 0.017 km. from weighted mean H=26.52.
2019 GD1JPL Sentry17302115-211511.566e-06-3.43-3.430JPL: Computed at 08:08 today Pacific time based on 53 observations spanning 12.845 days (2019-Apr-02.47647 to 2019-Apr-15.32175). Diameter approximately 0.310 km. from weighted mean H=20.18.
NEODyS1730211511.76e-06-3.38-3.380NEODyS: "Based on 53 optical observations (of which 0 are rejected as outliers) from 2019-04-02.477 to 2019-04-15.323."
2017 GF8JPL Sentry1832R E M O V E DJPL: Risk listing removed at 1828 UTC today
2017 AR20JPL Sentry1832R E M O V E DJPL: Risk listing removed at 1810 UTC today
2014 NJ65JPL Sentry1832R E M O V E DJPL: Risk listing removed at 1824 UTC today

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 17 April '19

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

2304Noted that JPL Sentry has updated its 2019 GC6 risk assessment - see above
1942Generated Traffic Report
1832Noted that JPL Sentry has removed 2014 NJ65 as an impact risk - see above
Noted that JPL Sentry has removed 2017 AR20 as an impact risk - see above
Noted that JPL Sentry has removed 2017 GF8 as an impact risk - see above
1730Noted that JPL Sentry has updated its 2019 GD1 risk assessment - see above
Noted that NEODyS has updated its 2019 GD1 risk assessment - see above
Noted that JPL Sentry has updated its 2019 GS19 risk assessment - see above
Noted that NEODyS has updated its 2019 GS19 risk assessment - see above
Grabbed MPEC 2019-H13 - Daily Orbit Update - see above
0440Grabbed MPEC 2019-H10 - 97 New Distant Objects - see above
Grabbed MPEC 2019-H11 - 2007 DX60 - see above
Grabbed MPEC 2019-H12 - 2007 TS68 - see above
0214Grabbed MPEC 2019-H05 - 2011 GZ61 - see above
Grabbed MPEC 2019-H06 - 2015 KG178 - see above
Grabbed MPEC 2019-H07 - 2015 KK178 = 2015 MA150 - see above
Grabbed MPEC 2019-H08 - 2015 XW379 - see above
Grabbed MPEC 2019-H09 - 2016 SE56 - see above