Contents  on 15 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 15 April '19

Twelve objects reported inside ten LD

There are twelve objects known to be less than ten lunar distances (LD) from Earth today. Nearest is risk-listed 2019 GC6, which moves in from 4.00 to 2.82 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 April 18 2019 GC6 16 m  2.82 from 4.00 LD April 10 - 26 intruder, NHATS target, risk
0.98 LD April 12 2019 GN20 17 m  9.03 to 12.34 LD April 9 - 15 NEW, intruder, exits ten LD - MPEC
1.70 LD April 11 2019 GV5 5 m  3.32 to 4.07 LD March 31 - April 23 NHATS target
1.72 LD April 13 2019 GN 14 m  5.38 to 7.95 LD April 9 - 16
2.09 LD April 11 2019 GT19 11 m  9.51 to 11.86 LD April 7 - 15 NEW, exits ten LD - MPEC
3.39 LD tomorrow 2019 GW20 11 m  3.64 from 5.53 LD April 13 - 19 NEW - MPEC
3.86 LD April 11 2019 GE1 12 m  5.97 to 7.15 LD April 5 - 18 NHATS target
4.04 LD April 18 2019 FN2 63 m  6.23 from 7.63 LD April 13 - 24 NHATS target
4.69 LD April 27 2019 GF1 10 m  6.75 from 7.08 LD April 7 - May 19 NHATS target
5.17 LD April 10 2019 GQ 16 m  9.35 to 10.98 LD April 6 - 15 exits ten LD
5.49 LD April 11 2019 GP19 16 m  6.50 to 7.04 LD April 1 - 20 NEW, NHATS target - MPEC
7.33 LD April 13 2019 GN4 38 m  8.56 to 11.25 LD April 12 - 15 exits ten LD

This report was generated at 1940 UTC with three discoveries announced late yesterday, two of which appear in the active traffic table above, and with three more announced early today, again with two listed in that table. The other two objects have already departed. Risk-listed 2019 GS19 (MPEC) flew by at 5.49 LD on April 11th and 2019 GU20 (MPEC) at 6.18 LD the following day. Today's DOU MPEC has follow-up for departed 2019 GJ4.

Approaching - sorted by 10-LD bubble entry date
9.09 LD April 23 2019 GM4 68 m  16.78 from 18.41 LD April 21 - 25
7.2   LD April 28* 2019 GX5 24 m  30.7 from 33.2 LD April 25 - May 1 EPU +/- 15 mins.*
6.1   LD May 17* 2019 GT1 35 m  27.4 from 28.2 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. 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 15 April '19

The MPC's NEO Confirmation Page has 37 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 37 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 64 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 15 April '19

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been 27 MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 15 Apr. '19 >>  MPEC 2019-G205 - "12:06 UT" - Daily Orbit Update


MPEC 2019-G204 - "04:20 UT" - 2019 GW20


MPEC 2019-G203 - "04:14 UT" - 2019 GV20


MPEC 2019-G202 - "04:08 UT" - 2019 GU20


MPEC 2019-G201 - "04:02 UT" - 2019 GT20


MPEC 2019-G200 - "03:56 UT" - 2019 GS20


MPEC 2019-G199 - "03:50 UT" - 2019 GR20


MPEC 2019-G198 - "03:44 UT" - 2019 GQ20


MPEC 2019-G197 - "03:38 UT" - 2019 GP20


MPEC 2019-G196 - "03:32 UT" - 2019 GO20


MPEC 2019-G195 - "03:26 UT" - 2019 GN20


MPEC 2019-G194 - "03:20 UT" - 2019 GM20


MPEC 2019-G193 - "03:14 UT" - 2019 GL20


MPEC 2019-G192 - "03:09 UT" - 2019 GK20


MPEC 2019-G191 - "03:03 UT" - 2019 GJ20


MPEC 2019-G190 - "02:57 UT" - 2019 GH20


MPEC 2019-G189 - "02:51 UT" - 2019 GG20


MPEC 2019-G188 - "02:45 UT" - 2019 GF20


MPEC 2019-G187 - "02:40 UT" - 2019 GE20


MPEC 2019-G186 - "02:34 UT" - 2019 GD20


MPEC 2019-G185 - "02:28 UT" - 2019 GC20


MPEC 2019-G184 - "02:22 UT" - 2019 GB20


MPEC 2019-G183 - "02:17 UT" - 2019 GA20


MPEC 2019-G182 - "02:11 UT" - 2019 GZ19


MPEC 2019-G181 - "02:05 UT" - 2019 GY19


MPEC 2019-G180 - "02:00 UT" - 2019 GX19


MPEC 2019-G179 - "01:54 UT" - 2019 GW19

Observers  on 15 April '19

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPECs 2019-G179, 2019-G180, 2019-G184, 2019-G185, 2019-G186, 2019-G187, 2019-G188, 2019-G192, 2019-G193, 2019-G197, 2019-G198, 2019-G199, 2019-G200, 2019-G202 & 2019-G204 -- 2019 GX19, 2019 GW20, 2019 GW19, 2019 GU20, 2019 GS20, 2019 GR20, 2019 GQ20, 2019 GP20, 2019 GL20, 2019 GK20, 2019 GF20, 2019 GE20, 2019 GD20, 2019 GC20, 2019 GB20
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2019-G195 -- 2019 GN20
I47Auger Obs. in Argentina, 1 in MPEC 2019-G195 -- 2019 GN20
160Castelmartini Obs. in Italy, 2 in MPECs 2019-G194 & 2019-G195 -- 2019 GN20, 2019 GM20
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2019-G188, 2019-G194, 2019-G195, 2019-G200 & 2019-G202 -- 2019 GU20, 2019 GS20, 2019 GN20, 2019 GM20, 2019 GF20
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 3 in MPECs 2019-G198, 2019-G201 & 2019-G205 -- 2019 GT20, 2019 GQ20, 2018 TT1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2019-G179, 2019-G180, 2019-G184, 2019-G185, 2019-G190, 2019-G191, 2019-G193, 2019-G197, 2019-G198, 2019-G201 & 2019-G205 -- 2019 GX19, 2019 GW19, 2019 GV19, 2019 GT20, 2019 GQ20, 2019 GP20, 2019 GL20, 2019 GJ20, 2019 GH20, 2019 GC20, 2019 GB20
Z99Clixby Obs. in England, 2 in MPECs 2019-G194 & 2019-G195 -- 2019 GN20, 2019 GM20
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2019-G195 -- 2019 GN20
822Cordoba Obs. in Argentina, 1 in MPEC 2019-G195 -- 2019 GN20
958Dax Obs. in France, 1 in MPEC 2019-G195 -- 2019 GN20
K87Dettelbach Vineyard Obs. in Germany, 2 in MPECs 2019-G194 & 2019-G195 -- 2019 GN20, 2019 GM20
L29Drebach-South Obs., 2 in MPECs 2019-G194 & 2019-G195 -- 2019 GN20, 2019 GM20
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2019-G195 -- 2019 GN20
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2019-G187, 2019-G189 & 2019-G192 -- 2019 GK20, 2019 GG20, 2019 GE20
L34Galhassin Robotic Telescope, 1 in MPEC 2019-G195 -- 2019 GN20
X31Galilei Obs., 2 in MPECs 2019-G200 & 2019-G202 -- 2019 GU20, 2019 GS20
K88GINOP-KHK in Hungary, 2 in MPECs 2019-G194 & 2019-G195 -- 2019 GN20, 2019 GM20
A17Guidestar Obs. in Germany, 1 in MPEC 2019-G200 -- 2019 GS20
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPECs 2019-G194 & 2019-G195 -- 2019 GN20, 2019 GM20
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPECs 2019-G179 & 2019-G205 -- 2019 GW19, 2019 GV19
K30Luscherz Obs. in Switzerland, 1 in MPEC 2019-G195 -- 2019 GN20
H01Magdalena Ridge Obs. (MRO) in New Mexico, 9 in MPECs 2019-G182, 2019-G189, 2019-G191, 2019-G194, 2019-G195, 2019-G196, 2019-G197, 2019-G203 & 2019-G204 -- 2019 GZ19, 2019 GW20, 2019 GV20, 2019 GP20, 2019 GO20, 2019 GN20, 2019 GM20, 2019 GJ20, 2019 GG20
711McDonald Obs. in Texas, 11 in MPECs 2019-G180, 2019-G181, 2019-G184, 2019-G186, 2019-G188, 2019-G189, 2019-G191, 2019-G192, 2019-G194, 2019-G196 & 2019-G202 -- 2019 GY19, 2019 GX19, 2019 GU20, 2019 GO20, 2019 GM20, 2019 GK20, 2019 GJ20, 2019 GG20, 2019 GF20, 2019 GD20, 2019 GB20
474Mt. John Obs. in New Zealand, 5 in MPECs 2019-G181, 2019-G182, 2019-G183, 2019-G187 & 2019-G196 -- 2019 GZ19, 2019 GY19, 2019 GO20, 2019 GE20, 2019 GA20
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2019-G183, 2019-G196, 2019-G197, 2019-G199, 2019-G200, 2019-G201, 2019-G202, 2019-G203, 2019-G204 & 2019-G205 -- 2019 GW20, 2019 GV20, 2019 GU20, 2019 GT20, 2019 GS20, 2019 GR20, 2019 GP20, 2019 GO20, 2019 GJ4, 2019 GA20
J69North Obs. in England, 4 in MPECs 2019-G194, 2019-G195, 2019-G202 & 2019-G205 -- 2019 GU20, 2019 GN20, 2019 GM20, 2016 GW221
Z80Northolt Branch Obs. in England, 4 in MPECs 2019-G194, 2019-G195, 2019-G200 & 2019-G202 -- 2019 GU20, 2019 GS20, 2019 GN20, 2019 GM20
F51Pan-STARRS 1 (PS1) in Hawaii, 21 in MPECs 2019-G179, 2019-G180, 2019-G181, 2019-G182, 2019-G183, 2019-G184, 2019-G185, 2019-G186, 2019-G187, 2019-G188, 2019-G189, 2019-G190, 2019-G191, 2019-G192, 2019-G193, 2019-G195, 2019-G197, 2019-G198, 2019-G199, 2019-G201 & 2019-G205 -- 2019 GZ19, 2019 GY19, 2019 GX19, 2019 GW19, 2019 GV19, 2019 GT20, 2019 GR20, 2019 GQ20, 2019 GP20, 2019 GN20, 2019 GL20, 2019 GK20, 2019 GJ20, 2019 GH20, 2019 GG20, 2019 GF20, 2019 GE20, 2019 GD20, 2019 GC20, 2019 GB20, 2019 GA20
K63Pascoli Obs. in Italy, 2 in MPECs 2019-G194 & 2019-G195 -- 2019 GN20, 2019 GM20
033Schwarzschild Obs. in Germany, 5 in MPECs 2019-G186, 2019-G188, 2019-G192, 2019-G194 & 2019-G195 -- 2019 GN20, 2019 GM20, 2019 GK20, 2019 GF20, 2019 GD20
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2019-G180, 2019-G182, 2019-G183, 2019-G185, 2019-G189 & 2019-G196 -- 2019 GZ19, 2019 GX19, 2019 GO20, 2019 GG20, 2019 GC20, 2019 GA20
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2019-G180, 2019-G181, 2019-G185, 2019-G186, 2019-G187, 2019-G188, 2019-G191, 2019-G193 & 2019-G205 -- 2019 GY19, 2019 GX19, 2019 GV19, 2019 GL20, 2019 GJ20, 2019 GF20, 2019 GE20, 2019 GD20, 2019 GC20
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2019-G194 & 2019-G195 -- 2019 GN20, 2019 GM20
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2019-G186, 2019-G194 & 2019-G195 -- 2019 GN20, 2019 GM20, 2019 GD20
I52Steward Obs. Mt. Lemmon Station in Arizona, 20 in MPECs 2019-G180, 2019-G181, 2019-G182, 2019-G186, 2019-G188, 2019-G189, 2019-G192, 2019-G194, 2019-G195, 2019-G196, 2019-G197, 2019-G198, 2019-G199, 2019-G200, 2019-G201, 2019-G202, 2019-G203, 2019-G204 & 2019-G205 -- 2019 GZ19, 2019 GY19, 2019 GX19, 2019 GW20, 2019 GV20, 2019 GU20, 2019 GT20, 2019 GS20, 2019 GR20, 2019 GQ20, 2019 GP20, 2019 GO20, 2019 GN20, 2019 GM20, 2019 GK20, 2019 GJ4, 2019 GG20, 2019 GF20, 2019 GD20, 2019 DN
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-G205 -- 2018 WR1
L01Visnjan Obs., 8 in MPECs 2019-G186, 2019-G188, 2019-G194, 2019-G195, 2019-G200, 2019-G202, 2019-G203 & 2019-G204 -- 2019 GW20, 2019 GV20, 2019 GU20, 2019 GS20, 2019 GN20, 2019 GM20, 2019 GF20, 2019 GD20
I41Zwicky Transient Facility in southern California, 1 in MPEC 2019-G202 -- 2019 GU20
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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 GU19NEODyS07162065-209151.2e-06-6.17-6.450NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2019-04-13.218 to 2019-04-14.488."
2019 GS19NEODyS0716210217.34e-08-7.55-7.550NEODyS: "Based on 49 optical observations (of which 4 are rejected as outliers) from 2019-04-11.388 to 2019-04-14.563."
JPL Sentry01022102-210211.324e-07-7.31-7.310JPL: Computed at 17:29 April 14th Pacific time based on 47 observations spanning 3.1753 days (2019-Apr-11.38728 to 2019-Apr-14.56259). Diameter approximately 0.026 km. from weighted mean H=25.58.
2019 GG19NEODyS0716211411.68e-09-8.65-8.650NEODyS: "Based on 73 optical observations (of which 0 are rejected as outliers) from 2019-04-08.263 to 2019-04-14.164."
2019 GK3JPL Sentry22362103-211638.21166e-06-7.71-7.710JPL: Computed at 15:25 today Pacific time based on 35 observations spanning 9.9878 days (2019-Apr-04.349765 to 2019-Apr-14.33752). Diameter approximately 0.004 km. from weighted mean H=29.50.
2019 FEJPL Sentry22362106-210611.679e-06-5.67-5.670JPL: Computed at 15:05 today Pacific time based on 191 observations spanning 27.904 days (2019-Mar-17.563057 to 2019-Apr-14.46718). Diameter approximately 0.050 km. from weighted mean H=24.16.

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 15 April '19

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

2236Noted that JPL Sentry has reposted 2019 FE as an impact risk - see above
Noted that JPL Sentry has updated its 2019 GK3 risk assessment - see above
1940Generated Traffic Report
1422Grabbed MPEC 2019-G205 - Daily Orbit Update - see above
0716Noted that NEODyS has posted 2019 GG19 as an impact risk - see above
Noted that NEODyS has posted 2019 GS19 as an impact risk - see above
Noted that NEODyS has posted 2019 GU19 as an impact risk - see above
0431Grabbed MPEC 2019-G179 - 2019 GW19 - see above
Grabbed MPEC 2019-G180 - 2019 GX19 - see above
Grabbed MPEC 2019-G181 - 2019 GY19 - see above
Grabbed MPEC 2019-G182 - 2019 GZ19 - see above
Grabbed MPEC 2019-G183 - 2019 GA20 - see above
Grabbed MPEC 2019-G184 - 2019 GB20 - see above
Grabbed MPEC 2019-G185 - 2019 GC20 - see above
Grabbed MPEC 2019-G186 - 2019 GD20 - see above
Grabbed MPEC 2019-G187 - 2019 GE20 - see above
Grabbed MPEC 2019-G188 - 2019 GF20 - see above
Grabbed MPEC 2019-G189 - 2019 GG20 - see above
Grabbed MPEC 2019-G190 - 2019 GH20 - see above
Grabbed MPEC 2019-G191 - 2019 GJ20 - see above
Grabbed MPEC 2019-G192 - 2019 GK20 - see above
Grabbed MPEC 2019-G193 - 2019 GL20 - see above
Grabbed MPEC 2019-G194 - 2019 GM20 - see above
Grabbed MPEC 2019-G195 - 2019 GN20 - see above
Grabbed MPEC 2019-G196 - 2019 GO20 - see above
Grabbed MPEC 2019-G197 - 2019 GP20 - see above
Grabbed MPEC 2019-G198 - 2019 GQ20 - see above
Grabbed MPEC 2019-G199 - 2019 GR20 - see above
Grabbed MPEC 2019-G200 - 2019 GS20 - see above
Grabbed MPEC 2019-G201 - 2019 GT20 - see above
Grabbed MPEC 2019-G202 - 2019 GU20 - see above
Grabbed MPEC 2019-G203 - 2019 GV20 - see above
Grabbed MPEC 2019-G204 - 2019 GW20 - see above
0102Noted that JPL Sentry has posted 2019 GS19 as an impact risk - see above