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Legend - object IDs plus links to more info

Data compiled at 1909 UTC on 25 April 2017 for 24 known objects during a period of seven days from 22 to 28 April 2017. Orange is for objects with a new JPL orbit solution (usually from new observation).

Chart
ID

Full ID
Period
Closest
Passage
Uncertainty

Status
CS2017 CS60.79 LDapproaching
DC362017 DC36133.08 LD  departed
FO1012017 FO10163.65 LD  departed
FT1022017 FT1029.17 LD  departed
GK62017 GK640.85 LD  departed
GN62017 GN622.43 LD  departed
GX62017 GX619.46 LD  departed
HB12017 HB13.59 LDoutbound
HD2017 HD3.76 LDoutbound
HE2017 HE25.70 LD  departed
HF2017 HF19.38 LD+/- one minute  departed
HG2017 HG24.53 LD  departed
HG12017 HG17.86 LD  departed
HH12017 HH16.07 LDoutbound
HJ2017 HJ19.30 LD  departed intruder
HL12017 HL112.67 LD  departed
HU22017 HU23.33 LDoutbound
HV22017 HV20.33 LDoutbound intruder
HW2017 HW12.15 LD  departed
HW22017 HW29.18 LD+/- one minuteinbound
HY2017 HY3.24 LDoutbound
HZ2017 HZ16.06 LD  departed
JO252014 JO2519.29 LD  departed
UW158436724 2011 UW158201.0 LD  distant
DateTfc.Time
22 April '17Rept. Line
23 April '17Rept. Line
24 April '17Rept. Line
25 April '17Rept. Line
26 April '17Rept. Line
27 April '17 Line
28 April '17 Line

Object Details - Skychart objects presented in reverse designation order, newest first
  ("designation assigned to" indicates unofficial discovery credit)

2017 HW2   -   inbound
Approximate diameter17 meters (H=26.484)
Closest Earth approach9.18 LD at 2158 UT on 27 April 2017
Inside ten LD of Earth25 to 29 April 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 23 April 2017 UTC
based on 17 observations spanning one day
Optical observation  
Links  
2017 HV2   -   outbound intruder
Approximate diameter6 meters (H=28.894)
Closest Earth approach0.33 LD at 2202 UT on 23 April 2017
Inside Earth-Moon system1116 on 23 April until 0849 UT on 24 April 2017
Inside Earth SOI22 to 25 April 2017
Inside ten LD of Earth19 to 28 April 2017
Closest Moon approach0.90 LD at 0710 UT on 24 April 2017
Inside one LD of Moon0204-1214 UT on 24 April 2017
Data based onJPL SSD orbit solution #2 downloaded from JPL on 24 April 2017 UTC
based on 68 observations spanning one day
Optical observation  
  • reported from 11 observing codes during 1.6059 days: 104, 204, 926, 958, G96, H01, I52, I93, J95, T12, W25
  • designation assigned to Mt. Lemmon Survey observation at 0642 UT 22 April 2017
  • last observed at 2115 UT on 23 April 2017 by Great Shefford Obs.
Links  
2017 HU2   -   outbound
Approximate diameter23 meters (H=25.871)
Closest Earth approach3.17 LD at 2110 UT on 20 April 2017
Inside ten LD of Earth10 April until 1 May 2017
Data based onJPL SSD orbit solution #3 downloaded from JPL on 25 April 2017 UTC
based on 89 observations spanning 2 days
Optical observation  
  • reported from 16 observing codes during 2.1325 days: 104, 107, 204, 474, 703, 926, 958, E23, H01, H21, I52, J95, K38, K51, W25, Z80
  • designation assigned to Catalina Sky Survey observation at 0500 UT 22 April 2017
  • last observed at 0811 UT on 24 April 2017 by Mt. John Obs.
Links  
2017 HL1   -     departed
Approximate diameter15 meters (H=26.821)
Closest Earth approach5.88 LD at 1957 UT on 15 April 2017
Inside ten LD of Earth11 to 20 April 2017
Data based onJPL SSD orbit solution #4 downloaded from JPL on 24 April 2017 UTC
based on 30 observations spanning 3 days
Optical observation  
  • reported from 7 observing codes during 3.2093 days: 474, 691, 807, 926, F51, I52, I93
  • first observed at 1026 UT on 20 April 2017 by Pan-STARRS 1
  • designation assigned to Pan-STARRS 1 observation at 1058 UT 20 April 2017
  • last observed at 1528 UT on 23 April 2017 by Mt. John Obs.
Links  
2017 HH1   -   outbound
Approximate diameter26 meters (H=25.559)
Closest Earth approach6.07 LD at 1454 UT on 23 April 2017
Inside ten LD of Earth21 to 25 April 2017
Data based onJPL SSD orbit solution #4 downloaded from JPL on 24 April 2017 UTC
based on 44 observations spanning 4 days
Optical observation  
  • reported from 11 observing codes during 3.9305 days: 104, 926, 958, F51, G96, H21, I52, I93, J95, K51, W25
  • designation assigned to Mt. Lemmon Survey observation at 0608 UT 19 April 2017
  • last observed at 0428 UT on 23 April 2017 by Tenagra II Obs.
Links  
2017 HG1   -     departed
Approximate diameter12 meters (H=27.282)
Closest Earth approach2.81 LD at 2158 UT on 16 April 2017
Inside ten LD of Earth10 to 23 April 2017
Data based onJPL SSD orbit solution #2 downloaded from JPL on 22 April 2017 UTC
based on 34 observations spanning 3 days
Optical observation  
  • reported from 7 observing codes during 3.0166 days: 104, 691, F51, G96, I52, I93, K51
  • designation assigned to Mt. Lemmon Survey observation at 0307 UT 19 April 2017
  • last observed at 0331 UT on 22 April 2017 by Steward Obs. Mt. Lemmon Station
Links  
2017 HB1   -   outbound
Approximate diameter19 meters (H=26.206)
Closest Earth approach3.59 LD at 0906 UT on 24 April 2017
Inside ten LD of Earth18 to 30 April 2017
Data based onJPL SSD orbit solution #6 downloaded from JPL on 25 April 2017 UTC
based on 84 observations spanning 31 days
Optical observation  
  • reported from 16 observing codes during 30.7001 days: 160, 203, 204, 470, 474, 703, 926, 958, C77, E10, E23, F51, G96, I93, J95, W25
  • first observed at 1008 UT on 25 March 2017 by Pan-STARRS 1
  • designation assigned to Mt. Lemmon Survey observation at 0610 UT 18 April 2017
  • last observed at 0256 UT on 25 April 2017 by Great Shefford Obs.
Links  
2017 HZ   -     departed
Approximate diameter13 meters (H=27.015)
Closest Earth approach9.28 LD at 2343 UT on 12 April 2017
Inside ten LD of Earth10 to 15 April 2017
Data based onJPL SSD orbit solution #3 downloaded from JPL on 23 April 2017 UTC
based on 32 observations spanning 5 days
Optical observation  
  • reported from 5 observing codes during 5.0148 days: 474, 705, 926, G96, I93
  • designation assigned to Mt. Lemmon Survey observation at 0852 UT 17 April 2017
  • last observed at 0914 UT on 22 April 2017 by Mt. John Obs.
Links  
2017 HY   -   outbound
Approximate diameter11 meters (H=27.476)
Closest Earth approach3.24 LD at 0955 UT on 24 April 2017
Inside ten LD of Earth18 to 30 April 2017
Data based onJPL SSD orbit solution #4 downloaded from JPL on 24 April 2017 UTC
based on 71 observations spanning 20 days
Optical observation  
  • reported from 11 observing codes during 19.9305 days: 204, 474, 703, 926, 958, F51, G96, I93, J95, K92, W25
  • first observed at 1152 UT on 3 April 2017 by Pan-STARRS 1
  • designation assigned to Mt. Lemmon Survey observation at 0852 UT 17 April 2017
  • last observed at 1012 UT on 23 April 2017 by Tenagra II Obs.
Links  
2017 HW   -     departed
Approximate diameter12 meters (H=27.31)
Closest Earth approach9.54 LD at 1146 UT on 18 April 2017
Inside ten LD of Earth17 to 19 April 2017
Data based onJPL SSD orbit solution #2 downloaded from JPL on 22 April 2017 UTC
based on 22 observations spanning 4 days
Optical observation  
  • reported from 3 observing codes during 4.3284 days: 474, G96, J95
  • first observed at 0619 UT on 17 April 2017 by the Mt. Lemmon Survey
  • designation assigned to Mt. Lemmon Survey observation at 0659 UT 17 April 2017
  • last observed at 1412 UT on 21 April 2017 by Mt. John Obs.
Links  
2017 HJ   -     departed intruder
Approximate diameter11 meters (H=27.433)
Closest Earth approach0.35 LD at 0542 UT on 16 April 2017
Inside Earth-Moon system2300 on 15 April until 1224 UT on 16 April 2017
Inside Earth SOI15 to 16 April 2017
Inside ten LD of Earth13 to 19 April 2017
Closest Moon approach1.14 LD at 0918 UT on 16 April 2017
Data based onJPL SSD orbit solution #7 downloaded from JPL on 25 April 2017 UTC
based on 56 observations spanning 7 days
Optical observation  
  • reported from 14 observing codes during 7.5571 days: 291, 807, 926, 958, E10, G96, I93, J04, J22, J95, K63, K92, Q63, T12
  • designation assigned to Mt. Lemmon Survey observation at 1012 UT 17 April 2017
  • last observed at 2335 UT on 24 April 2017 by ESA Optical Ground Station
Notesrisk
Links  
2017 HG   -     departed
Approximate diameter20 meters (H=26.132)
Closest Earth approach4.30 LD at 0912 UT on 13 April 2017
Inside ten LD of Earth10 to 16 April 2017
Data based onJPL SSD orbit solution #3 downloaded from JPL on 24 April 2017 UTC
based on 31 observations spanning 5 days
Optical observation  
  • reported from 6 observing codes during 5.1225 days: 691, 705, 926, G96, I93, J95
  • designation assigned to Mt. Lemmon Survey observation at 0719 UT 17 April 2017
  • last observed at 1015 UT on 22 April 2017 by the Spacewatch 0.9m telescope
Links  
2017 HF   -     departed
Approximate diameter16 meters (H=26.691)
Closest Earth approach2.92 LD at 2004 UT on 9 April 2017
Inside ten LD of Earth3 to 15 April 2017
Data based onJPL SSD orbit solution #5 downloaded from JPL on 24 April 2017 UTC
based on 49 observations spanning 7 days
Optical observation  
  • reported from 10 observing codes during 7.0801 days: 203, 291, 474, 705, 958, B74, G96, I52, I93, K88
  • designation assigned to Mt. Lemmon Survey observation at 0843 UT 16 April 2017
  • last observed at 1038 UT on 23 April 2017 by the Spacewatch 1.8m telescope
Links  
2017 HE   -     departed
Approximate diameter16 meters (H=26.682)
Closest Earth approach2.92 LD at 0417 UT on 10 April 2017
Inside ten LD of Earth5 to 14 April 2017
Data based onJPL SSD orbit solution #4 downloaded from JPL on 23 April 2017 UTC
based on 30 observations spanning 7 days
Optical observation  
  • reported from 6 observing codes during 7.0197 days: 474, 691, 807, G96, I52, K88
  • designation assigned to Mt. Lemmon Survey observation at 0823 UT 16 April 2017
  • last observed at 0851 UT on 23 April 2017 by the Spacewatch 0.9m telescope
Links  
2017 HD   -   outbound
Approximate diameter15 meters (H=26.761)
Closest Earth approach3.76 LD at 1703 UT on 22 April 2017
Inside ten LD of Earth19 to 26 April 2017
Data based onJPL SSD orbit solution #5 downloaded from JPL on 24 April 2017 UTC
based on 33 observations spanning 6 days
Optical observation  
  • reported from 5 observing codes during 6.1480 days: 204, 705, 926, G96, I52
  • designation assigned to Mt. Lemmon Survey observation at 0810 UT 16 April 2017
  • last observed at 1143 UT on 22 April 2017 by Tenagra II Obs.
Links  
2017 GX6   -     departed
Approximate diameter12 meters (H=27.209)
Closest Earth approach4.36 LD at 1934 UT on 6 April 2017
Inside ten LD of Earth30 March until 13 April 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 11 April 2017 UTC
based on 16 observations spanning one day
Optical observation  
  • reported from 3 observing codes during 1.0429 days: 926, G96, J95
  • designation assigned to Mt. Lemmon Survey observation at 0952 UT 8 April 2017
  • last observed at 1054 UT on 9 April 2017 by Tenagra II Obs.
Links  
2017 GN6   -     departed
Approximate diameter9 meters (H=27.995)
Closest Earth approach4.06 LD at 0517 UT on 4 April 2017
Inside ten LD of Earth27 March until 11 April 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 11 April 2017 UTC
based on 41 observations spanning 4 days
Optical observation  
  • reported from 5 observing codes during 4.0602 days: 926, G96, H21, I52, J95
  • designation assigned to Mt. Lemmon Survey observation at 0946 UT 5 April 2017
  • last observed at 1113 UT on 9 April 2017 by Tenagra II Obs.
Links  
2017 GK6   -     departed
Approximate diameter24 meters (H=25.739)
Closest Earth approach2.73 LD at 1435 UT on 4 April 2017
Inside ten LD of Earth31 March until 8 April 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 11 April 2017 UTC
based on 46 observations spanning 4 days
Optical observation  
  • reported from 5 observing codes during 3.9326 days: 807, 926, E23, I52, Y00
  • designation assigned to SONEAR observation at 0636 UT 5 April 2017
  • last observed at 0459 UT on 9 April 2017 by Robert Holmes via Cerro Tololo Inter-American Obs.
Links  
2017 FT102   -     departed
Approximate diameter4 meters (H=29.471)
Closest Earth approach1.05 LD at 1716 UT on 3 April 2017
Inside Earth SOI30 March until 7 April 2017
Inside ten LD of Earth14 March until 23 April 2017
Closest Moon approach1.04 LD at 1822 UT on 3 April 2017
Data based onJPL SSD orbit solution #7 downloaded from JPL on 5 April 2017 UTC
based on 73 observations spanning 5 days
Optical observation  
  • reported from 10 observing codes during 4.9359 days: 104, 151, 474, 926, 958, G96, I52, I93, J95, T12
  • designation assigned to Mt. Lemmon Survey observation at 0635 UT 29 March 2017
  • last observed at 0503 UT on 3 April 2017 by Steward Obs. Mt. Lemmon Station
NotesNHATS target
Links  
2017 FO101   -     departed
Approximate diameter31 meters (H=25.226)
Closest Earth approach3.61 LD at 2316 UT on 21 March 2017
Inside ten LD of Earth17 to 26 March 2017
Data based onJPL SSD orbit solution #5 downloaded from JPL on 23 April 2017 UTC
based on 69 observations spanning 27 days
Optical observation  
  • reported from 13 observing codes during 26.8046 days: 104, 204, 691, 703, 807, 926, G96, I52, I93, J04, J95, K61, K65
  • designation assigned to Catalina Sky Survey observation at 1109 UT 26 March 2017
  • last observed at 0627 UT on 22 April 2017 by Robert Holmes via Cerro Tololo Inter-American Obs.
Links  
2017 DC36   -     departed
Approximate diameter129 meters (H=22.1)
Closest Earth approach4.23 LD at 1205 UT on 18 Feb. 2017
Inside ten LD of Earth13 to 23 Feb. 2017
Data based onJPL SSD orbit solution #27 downloaded from JPL on 24 April 2017 UTC
based on 335 observations spanning 60 days
Optical observation  
  • reported from 39 observing codes during 59.5962 days: 104, 107, 160, 204, 215, 300, 474, 703, 807, 900, 926, 958, C23, C27, C43, D29, G34, G40, G45, G96, H01, H21, H45, I52, J22, J95, K30, K61, K83, K92, L04, O75, Q62, T05, T08, W25, W88, Y00, Z45
  • first observed at 1229 UT on 22 Feb. 2017 by ATLAS Mauna Loa
  • designation assigned to ATLAS Haleakala observation at 1147 UT 23 Feb. 2017
  • last observed at 0247 UT on 23 April 2017 by ARO Westfield
NotesNHATS target
Links  
2017 CS   -   approaching
Approximate diameter446 meters (H=19.4)
Closest Earth approach7.93 LD at 1543 UT on 29 May 2017
Inside ten LD of Earth26 May until 1 June 2017
Data based onJPL SSD orbit solution #40 downloaded from JPL on 23 April 2017 UTC
based on 225 observations spanning 92 days
Optical observation  
  • reported from 22 observing codes during 92.2450 days: 107, 151, 204, 291, 691, 695, 703, 807, B67, F51, G45, G48, G96, H21, H45, K65, K91, Q62, T05, W25, W85, W88
  • first observed at 1339 UT on 20 Jan. 2017 by Pan-STARRS 1
  • designation assigned to Pan-STARRS 1 observation at 1205 UT 2 Feb. 2017
  • last observed at 1932 UT on 22 April 2017 by Cavezzo Obs.
Notesradar target
Links  
2014 JO25   -     departed
Approximate diameter812 meters (H=18.1)
Closest Earth approach4.57 LD at 1223 UT on 19 April 2017
Inside ten LD of Earth18 to 20 April 2017
Data based onJPL SSD orbit solution #30 downloaded from JPL on 25 April 2017 UTC
based on 887 observations spanning 2011-2017
Optical observation  
  • reported from 52 observing codes during 7.7445 days: 006, 104, 151, 160, 204, 213, 510, 595, 619, 703, 926, 970, A77, A81, B49, B74, B92, C23, C47, C77, C97, G27, G34, G96, H06, H32, H45, I39, I52, J22, J38, J69, J95, K17, K40, K42, K63, K74, K85, L04, Q62, T08, T12, V37, V78, V83, W25, W34, W63, Y00, Z73, Z80
  • first observed at 1143 UT on 17 April 2017 by Tenagra II Obs.
  • last observed at 0535 UT on 25 April 2017 by Petit Jean Mtn. South Obs.
Notesradar target
previous observation May 2011, observation May-June 2014, and observation Sept. 2016
Links  
436724 2011 UW158   -     distant
Approximate diameter355 meters (H=19.9)
Distance from Earth202.9 LD during the observation period
Data based onJPL SSD orbit solution #136 downloaded from JPL on 22 April 2017 UTC
based on 940 observations spanning 2011-2017 including radar
Optical observation  
  • reported from one observing code during 0.310 hours: G96
  • first observed at 0519 UT on 19 April 2017 by the Mt. Lemmon Survey
  • last observed at 0537 UT on 19 April 2017 by the Mt. Lemmon Survey
NotesNHATS target
previous observation Oct.-Dec. 2011, observation March-Dec. 2013, and passage July 2015 at 6.40 LD
Links  

Footnotes

Illustration of ten lunar distances.

1. Ten lunar distances:  A "lunar distance" (LD) is the average distance between Earth and Moon (about 384,400 km., the same as 238,855 miles or nearly ten [9.59] times around Earth's equator). Ten lunar distances has no special astronomical importance but is a useful arbitrary "bubble" within which to organize this reporting. An approach by a small Solar-System body starts to become interesting at less than four LD out from Earth as it encounters our planet's "Hill sphere" (distance indicated by the blue line in this illustration at about 3.9 LD). This is a region within which Earth's gravitational influence can change the orbits of passing objects. The Moon also has a Hill sphere, outlined here as a gray circle. (Earth and Moon are not shown to scale.) The "Earth-Moon system" is generally defined as that region of space within a radius of one lunar distance from Earth, so an object can pass very close to the Moon yet not be described as coming "inside" the E-M system.

2. Data credit:  All data on this page derived from orbit solutions comes from the NASA JPL Solar System Dynamics (SSD) Group through its Horizons system. All information about optical observations comes from the IAU Minor Planet Center (MPC) and info about radar observations comes from JPL SSD. The MPC, NASA, and JPL are not associated with this page or A/CC, and responsibility for the interpretation of this information and its use here rests entirely with A/CC. Important note: Approach times presented here as to-the-minute may have unstated uncertainties of a few minutes, or many minutes or even hours for objects with old or very short observation spans, which is significant because the Earth moves through its own diameter in about seven minutes. Thus actual encounter distances may vary, occasionally by as much as ten lunar distances. See JPL's Close Approach Tables for nominal vs. minimum possible passage distances and times and for their note about uncertainties.

3. Size estimates:  Object diameters are rough approximations derived by standard formula from H, an object's "absolute magnitude" (brightness), where higher numbers represent dimmer (thus usually smaller) objects.