IOTA/IOTA-ES occultation update for 2013 GJ137 / UCAC4 331-077708 event on 2023 Aug 09, 21:37 UT Visible from Summary ------- On 2023 Aug 09 UT, the 66.1 km diameter asteroid 2013 GJ137 will occult a 13.9 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 9.59 mag to 23.50 mag (the magnitude of the asteroid) for at most 52.540 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 0 * date and approx. time of event: 2023 Aug 09, 19:23 - 2023 Aug 09, 22:04 * geocentric midpoint of event [JD]: 2460166.36435846 * magnitude of target star: 13.91 * magnitude drop [mag]: 9.59 * estimated maximum duration [s]: 52.540 * Moon: 35 % sunlit, 172° distance * Sun: 100° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 2046.05 * 1 sigma uncertainty interval [seconds]: +/- 86287.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 6.678, +/- 4.281) * 1 sigma uncertainty ellipse (major, minor, PA): (7.855", 1.103", 122°) * approx speed of asteroid's shadow [km/s]: 1.2575 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 331-077708 by 0 2013 GJ137 on 2023 Aug 9 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -105 0 0 1 14 18 19 25 38.9 1 114 75 0 54 6 1 34 33 .. .. .. .. .. .. .... -104 0 0 0 47 43 19 25 41.1 2 114 74 0 27 32 1 7 56 .. .. .. .. .. .. -0.09 -103 0 0 0 21 28 19 25 45.5 3 114 73 0 1 19 0 41 39 .. .. .. .. .. .. -0.16 -102 0 0 - 0 4 26 19 25 51.9 4 114 72 - 0 24 33 0 15 43 .. .. .. .. .. .. -0.19 -101 0 0 - 0 29 57 19 26 0.5 5 114 71 - 0 50 2 - 0 9 51 .. .. .. .. .. .. -0.21 -100 0 0 - 0 55 5 19 26 11.3 6 114 71 - 1 15 8 - 0 35 1 .. .. .. .. .. .. -0.22 - 99 0 0 - 1 19 48 19 26 24.3 7 114 70 - 1 39 49 - 0 59 46 .. .. .. .. .. .. -0.23 - 98 0 0 - 1 44 6 19 26 39.6 8 114 69 - 2 4 4 - 1 24 6 .. .. .. .. .. .. -0.24 - 97 0 0 - 2 7 57 19 26 57.2 10 114 68 - 2 27 53 - 1 47 59 .. .. .. .. .. .. -0.24 - 96 0 0 - 2 31 20 19 27 17.0 11 114 67 - 2 51 14 - 2 11 25 .. .. .. .. .. .. -0.25 - 95 0 0 - 2 54 15 19 27 39.2 12 114 66 - 3 14 6 - 2 34 21 .. .. .. .. .. .. -0.25 - 94 0 0 - 3 16 39 19 28 3.7 13 114 65 - 3 36 28 - 2 56 47 .. .. .. .. .. .. -0.26 - 93 0 0 - 3 38 32 19 28 30.6 14 114 64 - 3 58 19 - 3 18 42 .. .. .. .. .. .. -0.26 - 92 0 0 - 3 59 52 19 29 0.0 15 114 63 - 4 19 37 - 3 40 5 .. .. .. .. .. .. -0.27 - 91 0 0 - 4 20 39 19 29 31.7 17 114 62 - 4 40 22 - 4 0 54 .. .. .. .. .. .. -0.28 - 90 0 0 - 4 40 51 19 30 5.9 18 114 61 - 5 0 31 - 4 21 8 .. .. .. .. .. .. -0.28 - 89 0 0 - 5 0 26 19 30 42.6 19 114 60 - 5 20 5 - 4 40 46 .. .. .. .. .. .. -0.29 - 88 0 0 - 5 19 25 19 31 21.7 20 114 59 - 5 39 1 - 4 59 46 .. .. .. .. .. .. -0.29 - 87 0 0 - 5 37 45 19 32 3.4 21 114 58 - 5 57 19 - 5 18 8 .. .. .. .. .. .. -0.30 - 86 0 0 - 5 55 25 19 32 47.6 22 114 57 - 6 14 57 - 5 35 51 .. .. .. .. .. .. -0.30 - 85 0 0 - 6 12 24 19 33 34.4 24 114 55 - 6 31 55 - 5 52 52 .. .. .. .. .. .. -0.31 - 84 0 0 - 6 28 41 19 34 23.7 25 114 54 - 6 48 10 - 6 9 10 .. .. .. .. .. .. -0.31 - 83 0 0 - 6 44 14 19 35 15.6 26 114 53 - 7 3 41 - 6 24 45 .. .. .. .. .. .. -0.32 - 82 0 0 - 6 59 2 19 36 10.1 27 114 52 - 7 18 28 - 6 39 35 .. .. .. .. .. .. -0.32 - 81 0 0 - 7 13 4 19 37 7.2 29 114 51 - 7 32 28 - 6 53 39 .. .. .. .. .. .. -0.33 - 80 0 0 - 7 26 19 19 38 7.0 30 114 50 - 7 45 41 - 7 6 54 .. .. .. .. .. .. -0.33 - 79 0 0 - 7 38 44 19 39 9.4 31 114 49 - 7 58 5 - 7 19 21 .. .. .. .. .. .. -0.34 - 78 0 0 - 7 50 20 19 40 14.5 32 114 48 - 8 9 39 - 7 30 57 .. .. .. .. .. .. -0.35 - 77 0 0 - 8 1 3 19 41 22.3 33 114 46 - 8 20 22 - 7 41 42 .. .. .. .. .. .. -0.35 - 76 0 0 - 8 10 53 19 42 32.7 35 114 45 - 8 30 11 - 7 51 33 .. .. .. .. .. .. -0.36 - 75 0 0 - 8 19 49 19 43 45.9 36 114 44 - 8 39 7 - 8 0 29 .. .. .. .. .. .. -0.36 - 74 0 0 - 8 27 49 19 45 1.8 37 114 43 - 8 47 6 - 8 8 30 .. .. .. .. .. .. -0.37 - 73 0 0 - 8 34 52 19 46 20.4 38 114 42 - 8 54 9 - 8 15 32 .. .. .. .. .. .. -0.37 - 72 0 0 - 8 40 55 19 47 41.8 40 114 41 - 9 0 13 - 8 21 36 .. .. .. .. .. .. -0.38 - 71 0 0 - 8 45 59 19 49 5.9 41 114 39 - 9 5 16 - 8 26 39 .. .. .. .. .. .. -0.39 - 70 0 0 - 8 50 0 19 50 32.8 42 115 38 - 9 9 18 - 8 30 39 .. .. .. .. .. .. -0.39 - 69 0 0 - 8 52 58 19 52 2.5 43 115 37 - 9 12 17 - 8 33 36 .. .. .. .. .. .. -0.40 - 68 0 0 - 8 54 50 19 53 34.9 45 115 36 - 9 14 11 - 8 35 27 .. .. .. .. .. .. -0.40 - 67 0 0 - 8 55 36 19 55 10.2 46 116 34 - 9 14 58 - 8 36 12 .. .. .. .. .. .. -0.41 - 66 0 0 - 8 55 14 19 56 48.3 47 116 33 - 9 14 38 - 8 35 47 .. .. .. .. .. .. -0.41 - 65 0 0 - 8 53 42 19 58 29.1 48 116 32 - 9 13 8 - 8 34 13 .. .. .. .. .. .. -0.42 - 64 0 0 - 8 50 58 20 0 12.8 50 117 31 - 9 10 27 - 8 31 26 .. .. .. .. .. .. -0.42 - 63 0 0 - 8 47 1 20 1 59.3 51 118 29 - 9 6 33 - 8 27 25 .. .. .. .. .. .. -0.43 - 62 0 0 - 8 41 48 20 3 48.6 52 118 28 - 9 1 24 - 8 22 9 .. .. .. .. .. .. -0.43 - 61 0 0 - 8 35 19 20 5 40.7 53 119 27 - 8 54 59 - 8 15 36 .. .. .. .. .. .. -0.43 - 60 0 0 - 8 27 31 20 7 35.6 55 120 25 - 8 47 16 - 8 7 44 .. .. .. .. .. .. -0.44 - 59 0 0 - 8 18 23 20 9 33.2 56 121 24 - 8 38 13 - 7 58 31 .. .. .. .. .. .. -0.44 - 58 0 0 - 8 7 53 20 11 33.7 57 122 23 - 8 27 48 - 7 47 55 .. .. .. .. .. .. -0.44 - 57 0 0 - 7 55 59 20 13 36.8 58 124 21 - 8 16 0 - 7 35 55 .. .. .. .. .. .. -0.44 - 56 0 0 - 7 42 40 20 15 42.7 59 125 20 - 8 2 47 - 7 22 29 .. .. .. .. .. .. -0.44 - 55 0 0 - 7 27 53 20 17 51.2 60 127 19 - 7 48 7 - 7 7 36 .. .. .. .. .. .. -0.44 - 54 0 0 - 7 11 38 20 20 2.4 61 129 17 - 7 31 59 - 6 51 13 .. .. .. .. .. .. -0.44 - 53 0 0 - 6 53 52 20 22 16.1 62 131 16 - 7 14 22 - 6 33 19 .. .. .. .. .. .. -0.44 - 52 0 0 - 6 34 35 20 24 32.3 63 133 15 - 6 55 13 - 6 13 53 .. .. .. .. .. .. -0.44 - 51 0 0 - 6 13 44 20 26 50.9 64 136 13 - 6 34 31 - 5 52 54 .. .. .. .. .. .. -0.44 - 50 0 0 - 5 51 19 20 29 11.9 65 139 12 - 6 12 15 - 5 30 19 .. .. .. .. .. .. -0.44 - 49 0 0 - 5 27 19 20 31 35.0 66 142 10 - 5 48 25 - 5 6 9 .. .. .. .. .. .. -0.43 - 48 0 0 - 5 1 43 20 34 0.2 66 145 9 - 5 22 59 - 4 40 23 .. .. .. .. .. .. -0.43 - 47 0 0 - 4 34 30 20 36 27.4 67 149 8 - 4 55 56 - 4 12 59 .. .. .. .. .. .. -0.42 - 46 0 0 - 4 5 40 20 38 56.3 67 152 6 - 4 27 17 - 3 43 58 .. .. .. .. .. .. -0.42 - 45 0 0 - 3 35 13 20 41 26.9 67 156 5 - 3 57 2 - 3 13 20 .. .. .. .. .. .. -0.41 - 44 0 0 - 3 3 9 20 43 58.8 68 160 3 - 3 25 9 - 2 41 5 .. .. .. .. .. .. -0.41 - 43 0 0 - 2 29 30 20 46 31.9 68 164 2 - 2 51 42 - 2 7 14 .. .. .. .. .. .. -0.40 - 42 0 0 - 1 54 16 20 49 6.0 67 168 1 - 2 16 39 - 1 31 48 .. .. .. .. .. .. -0.39 - 41 0 0 - 1 17 29 20 51 40.7 67 173 -1 - 1 40 4 - 0 54 49 .. .. .. .. .. .. -0.39 - 40 0 0 - 0 39 11 20 54 15.8 67 176 -2 - 1 1 58 - 0 16 20 .. .. .. .. .. .. -0.38 - 39 0 0 0 0 35 20 56 51.0 66 180 -4 - 0 22 23 0 23 38 .. .. .. .. .. .. -0.37 - 38 0 0 0 41 47 20 59 26.1 65 184 -5 0 18 37 1 5 0 .. .. .. .. .. .. -0.36 - 37 0 0 1 24 19 21 2 0.6 64 187 -6 1 0 59 1 47 43 .. .. .. .. .. .. -0.35 - 36 0 0 2 8 9 21 4 34.2 63 190 -8 1 44 39 2 31 43 .. .. .. .. .. .. -0.35 - 35 0 0 2 53 12 21 7 6.7 62 193 -9 2 29 31 3 16 56 .. .. .. .. .. .. -0.34 - 34 0 0 3 39 21 21 9 37.6 61 196 -11 3 15 32 4 3 15 .. .. .. .. .. .. -0.33 - 33 0 0 4 26 34 21 12 6.6 60 198 -12 4 2 36 4 50 35 .. .. .. .. .. .. -0.32 - 32 0 0 5 14 42 21 14 33.5 59 201 -13 4 50 37 5 38 51 .. .. .. .. .. .. -0.31 - 31 0 0 6 3 40 21 16 57.8 57 203 -14 5 39 28 6 27 56 .. .. .. .. .. .. -0.30 - 30 0 0 6 53 22 21 19 19.3 56 205 -16 6 29 4 7 17 43 .. .. .. .. .. .. -0.29 - 29 0 0 7 43 41 21 21 37.7 55 206 -17 7 19 19 8 8 8 .. .. .. .. .. .. -0.29 - 28 0 0 8 34 32 21 23 52.7 53 208 -18 8 10 5 8 59 2 .. .. .. .. .. .. -0.28 - 27 0 0 9 25 46 21 26 4.2 52 209 -19 9 1 16 9 50 19 .. .. .. .. .. .. -0.27 - 26 0 0 10 17 19 21 28 11.8 50 211 -20 9 52 46 10 41 54 .. .. .. .. .. .. -0.26 - 25 0 0 11 9 3 21 30 15.4 49 212 -21 10 44 29 11 33 39 .. .. .. .. .. .. -0.26 - 24 0 0 12 0 53 21 32 15.0 47 213 -22 11 36 19 12 25 30 .. .. .. .. .. .. -0.25 - 23 0 0 12 52 43 21 34 10.2 46 214 -23 12 28 9 13 17 20 .. .. .. .. .. .. -0.25 - 22 0 0 13 44 28 21 36 1.1 44 215 -24 13 19 55 14 9 4 .. .. .. .. .. .. -0.24 - 21 0 0 14 36 3 21 37 47.7 43 216 -25 14 11 32 15 0 37 .. .. .. .. .. .. -0.24 - 20 0 0 15 27 23 21 39 29.7 41 217 -26 15 2 54 15 51 54 .. .. .. .. .. .. -0.23 - 19 0 0 16 18 24 21 41 7.3 40 218 -27 15 53 58 16 42 52 .. .. .. .. .. .. -0.23 - 18 0 0 17 9 1 21 42 40.5 38 219 -28 16 44 39 17 33 26 .. .. .. .. .. .. -0.22 - 17 0 0 17 59 12 21 44 9.2 37 219 -28 17 34 54 18 23 33 .. .. .. .. .. .. -0.22 - 16 0 0 18 48 54 21 45 33.6 35 220 -29 18 24 39 19 13 10 .. .. .. .. .. .. -0.22 - 15 0 0 19 38 3 21 46 53.7 34 221 -30 19 13 53 20 2 15 .. .. .. .. .. .. -0.22 - 14 0 0 20 26 37 21 48 9.5 32 222 -30 20 2 32 20 50 44 .. .. .. .. .. .. -0.21 - 13 0 0 21 14 34 21 49 21.2 31 222 -31 20 50 35 21 38 36 .. .. .. .. .. .. -0.21 - 12 0 0 22 1 53 21 50 28.9 29 223 -31 21 37 59 22 25 49 .. .. .. .. .. .. -0.21 - 11 0 0 22 48 31 21 51 32.6 28 224 -32 22 24 43 23 12 22 .. .. .. .. .. .. -0.21 - 10 0 0 23 34 28 21 52 32.5 27 224 -32 23 10 45 23 58 13 .. .. .. .. .. .. -0.21 - 9 0 0 24 19 42 21 53 28.6 25 225 -33 23 56 5 24 43 21 .. .. .. .. .. .. -0.21 - 8 0 0 25 4 13 21 54 21.2 24 226 -33 24 40 42 25 27 46 .. .. .. .. .. .. -0.21 - 7 0 0 25 48 0 21 55 10.3 23 226 -33 25 24 35 26 11 27 .. .. .. .. .. .. -0.21 - 6 0 0 26 31 2 21 55 56.0 22 227 -34 26 7 43 26 54 24 .. .. .. .. .. .. -0.21 - 5 0 0 27 13 20 21 56 38.5 20 227 -34 26 50 7 27 36 36 .. .. .. .. .. .. -0.21 - 4 0 0 27 54 53 21 57 17.8 19 228 -34 27 31 46 28 18 3 .. .. .. .. .. .. -0.21 - 3 0 0 28 35 41 21 57 54.2 18 229 -34 28 12 39 28 58 45 .. .. .. .. .. .. -0.21 - 2 0 0 29 15 44 21 58 27.6 17 229 -35 28 52 48 29 38 42 .. .. .. .. .. .. -0.21 - 1 0 0 29 55 2 21 58 58.3 16 230 -35 29 32 12 30 17 55 .. .. .. .. .. .. -0.22 0 0 0 30 33 36 21 59 26.3 14 230 -35 30 10 52 30 56 23 .. .. .. .. .. .. -0.22 1 0 0 31 11 25 21 59 51.8 13 231 -35 30 48 47 31 34 7 .. .. .. .. .. .. -0.22 2 0 0 31 48 31 22 0 14.8 12 232 -35 31 25 58 32 11 7 .. .. .. .. .. .. -0.22 3 0 0 32 24 53 22 0 35.5 11 232 -35 32 2 25 32 47 23 .. .. .. .. .. .. -0.22 4 0 0 33 0 32 22 0 53.9 10 233 -35 32 38 9 33 22 57 .. .. .. .. .. .. -0.22 5 0 0 33 35 28 22 1 10.1 9 233 -35 33 13 11 33 57 48 .. .. .. .. .. .. -0.23 6 0 0 34 9 42 22 1 24.3 8 234 -35 33 47 30 34 31 57 .. .. .. .. .. .. -0.23 7 0 0 34 43 15 22 1 36.5 7 235 -35 34 21 8 35 5 24 .. .. .. .. .. .. -0.23 8 0 0 35 16 6 22 1 46.9 6 235 -35 34 54 4 35 38 11 .. .. .. .. .. .. -0.23 9 0 0 35 48 17 22 1 55.4 5 236 -35 35 26 20 36 10 17 .. .. .. .. .. .. -0.23 10 0 0 36 19 48 22 2 2.1 4 236 -34 35 57 56 36 41 43 .. .. .. .. .. .. -0.23 11 0 0 36 50 40 22 2 7.3 3 237 -34 36 28 52 37 12 30 .. .. .. .. .. .. -0.23 12 0 0 37 20 52 22 2 10.8 2 238 -34 36 59 10 37 42 38 .. .. .. .. .. .. -0.23 13 0 0 37 50 27 22 2 12.8 1 238 -34 37 28 49 38 12 8 .. .. .. .. .. .. -0.20 14 0 0 38 19 24 22 2 13.4 0 239 -34 37 57 50 .. .. .. .. .. .. .. .. .. 7.51 Uncertainty in time = +/- 133224 secs Prediction of 2022 Jun 15.2 Data for the target star ------------------------ * name: UCAC4 331-077708 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 31 23.2565 DE: -23 57 05.645 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 31 23.2563 DE: -23 57 05.644 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 13.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: 2013 GJ137 asteroid class: TNO approx. diameter [km]: 66 approx. diameter ["]: 0.003 distance from Earth [AU]: 29.87940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#8 date of fit: 2021 Apr 15 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 7.855", 1.103", 122.127° remarks: * orbital elements for 2013 GJ137 : Mean anomaly = 339.7839531272 deg Arg. of pericenter = 231.5473078993 deg Long. of node = 42.5366123745 deg Inclination = 16.9103815101 deg Eccentricity = 0.2647862195 Semimajor axis = 39.3384575215 AU Perihelion dist = 28.9221760723 AU Mag: H = 8.50, G = 0.15 Epoch of elements : MJD 60165.90090278 TDT (2023 Aug 09.9009) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#82021Apr15,52.54,2023,8,9,20.744603,-0.133258,0.357174,0.665117,0.247844,0.005634,-0.001302,0.000000,0.000000 -36.0588,-24.0326,-129.79,15.74,False UCAC4 331-077708,15.52312675,-23.9515679,0.00,13.91,0.00,0.0,0,,15.54628225,-24.0325903,9.59,0.00,0,0,0 0,2013 GJ137,23.50,66.1,29.8794,0,0,0.014,0.07,,6.6 0,339.7804,2023,8,9,231.5473,42.5366,16.9104,0.26479,39.33846,28.92218,8.50,5.0,0.15 2047.050,7.8553,1.1033,122,6.2409,Known errors,-1.00,-1,-1,-1 20230809_077708,59745.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 15, 04:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org