IOTA/IOTA-ES occultation update for (117) Lomia / UCAC4 667-032641 event on 2023 Jan 16, 02:43 UT Visible from Europe, Canada, USA, Mexico Summary ------- On 2023 Jan 16 UT, the 158.1 km diameter asteroid (117) Lomia will occult a 11.4 mag star in the constellation Auriga for observers along a path across Europe, Canada, USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.68 mag to 12.84 mag (the magnitude of the asteroid) for at most 16.990 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: 99 * date and approx. time of event: 2023 Jan 16, 02:31 - 2023 Jan 16, 02:55 * geocentric midpoint of event [JD]: 2459960.61350725 * magnitude of target star: 11.42 * magnitude drop [mag]: 1.68 * estimated maximum duration [s]: 16.990 * Moon: 39 % sunlit, 136° distance * Sun: 139° distance * rough path description: Europe, Canada, USA, Mexico The occultation path -------------------- * approximate projected width [km]: 160 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.029, +/- 0.021) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.021", 82°) * approx speed of asteroid's shadow [km/s]: 9.3050 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 667-032641 by 117 Lomia on 2023 Jan 16 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 ' " Longitude Longitude Longitude Longitude -144 47 39 -27 0 0 2 54 46.0 0 40 21 ... .. .. -143 45 26 ... .. .. -143 16 17 .... -143 52 38 -26 0 0 2 54 45.8 1 39 20 -144 54 22 -142 51 25 -145 23 41 -142 22 43 -0.17 -142 59 6 -25 0 0 2 54 45.3 3 39 19 -143 59 52 -141 58 49 -144 28 43 -141 30 32 -0.14 -142 6 56 -24 0 0 2 54 44.5 4 39 18 -143 6 48 -141 7 30 -143 35 13 -140 39 38 -0.12 -141 16 2 -23 0 0 2 54 43.3 5 38 17 -142 15 5 -140 17 25 -142 43 5 -139 49 54 -0.12 -140 26 19 -22 0 0 2 54 41.9 6 38 16 -141 24 35 -139 28 27 -141 52 12 -139 1 17 -0.11 -139 37 42 -21 0 0 2 54 40.1 8 38 15 -140 35 15 -138 40 32 -141 2 31 -138 13 41 -0.11 -138 50 7 -20 0 0 2 54 38.0 9 37 14 -139 46 59 -137 53 35 -140 13 56 -137 27 2 -0.11 -138 3 29 -19 0 0 2 54 35.5 10 37 13 -138 59 43 -137 7 33 -139 26 22 -136 41 17 -0.11 -137 17 44 -18 0 0 2 54 32.8 11 37 12 -138 13 24 -136 22 22 -138 39 45 -135 56 22 -0.11 -136 32 49 -17 0 0 2 54 29.8 13 37 11 -137 27 56 -135 37 59 -137 54 2 -135 12 13 -0.10 -135 48 41 -16 0 0 2 54 26.5 14 37 10 -136 43 17 -134 54 20 -137 9 8 -134 28 47 -0.10 -135 5 15 -15 0 0 2 54 22.9 15 36 9 -135 59 24 -134 11 21 -136 25 1 -133 46 1 -0.10 -134 22 30 -14 0 0 2 54 19.1 16 36 8 -135 16 13 -133 29 1 -135 41 38 -133 3 52 -0.10 -133 40 22 -13 0 0 2 54 14.9 17 36 7 -134 33 41 -132 47 17 -134 58 54 -132 22 19 -0.10 -132 58 50 -12 0 0 2 54 10.5 19 36 6 -133 51 46 -132 6 5 -134 16 48 -131 41 17 -0.10 -132 17 49 -11 0 0 2 54 5.8 20 36 5 -133 10 25 -131 25 25 -133 35 17 -131 0 45 -0.10 -131 37 18 -10 0 0 2 54 0.9 21 36 4 -132 29 36 -130 45 12 -132 54 19 -130 20 41 -0.10 -130 57 16 - 9 0 0 2 53 55.7 22 36 3 -131 49 16 -130 5 26 -132 13 51 -129 41 2 -0.10 -130 17 38 - 8 0 0 2 53 50.2 23 36 2 -131 9 23 -129 26 3 -131 33 51 -129 1 47 -0.10 -129 38 25 - 7 0 0 2 53 44.5 24 36 1 -130 29 55 -128 47 3 -130 54 16 -128 22 52 -0.10 -128 59 33 - 6 0 0 2 53 38.6 26 35 0 -129 50 51 -128 8 23 -130 15 5 -127 44 18 -0.10 -128 21 0 - 5 0 0 2 53 32.4 27 35 -1 -129 12 7 -127 30 1 -129 36 16 -127 6 1 -0.10 -127 42 46 - 4 0 0 2 53 25.9 28 35 -2 -128 33 43 -126 51 56 -128 57 47 -126 27 59 -0.10 -127 4 48 - 3 0 0 2 53 19.2 29 35 -3 -127 55 36 -126 14 5 -128 19 37 -125 50 13 -0.10 -126 27 4 - 2 0 0 2 53 12.3 30 35 -3 -127 17 46 -125 36 28 -127 41 42 -125 12 38 -0.10 -125 49 33 - 1 0 0 2 53 5.1 31 36 -4 -126 40 9 -124 59 2 -127 4 3 -124 35 15 -0.10 -125 12 13 0 0 0 2 52 57.8 33 36 -5 -126 2 45 -124 21 47 -126 26 37 -123 58 1 -0.10 -124 35 3 1 0 0 2 52 50.2 34 36 -6 -125 25 32 -123 44 40 -125 49 22 -123 20 55 -0.10 Latitude Latitude Latitude Latitude -124 0 0 1 56 48 2 52 42.7 35 36 -7 3 18 48 0 35 11 3 57 37 - 0 3 12 -0.10 -123 0 0 3 34 23 2 52 29.6 37 36 -9 4 56 43 2 12 26 5 35 42 1 33 54 -0.10 -122 0 0 5 12 17 2 52 15.8 38 36 -10 6 34 55 3 50 4 7 14 2 3 11 24 -0.10 -121 0 0 6 50 21 2 52 1.4 40 36 -11 8 13 12 5 27 54 8 52 26 4 49 8 -0.10 -120 0 0 8 28 23 2 51 46.5 42 37 -13 9 51 25 7 5 46 10 30 45 6 26 56 -0.10 -119 0 0 10 6 14 2 51 31.1 44 37 -14 11 29 24 8 43 30 12 8 47 8 4 37 -0.10 -118 0 0 11 43 44 2 51 15.2 46 38 -16 13 6 58 10 20 57 13 46 24 9 42 2 -0.11 -117 0 0 13 20 43 2 50 59.0 48 38 -17 14 43 59 11 57 55 15 23 25 11 19 0 -0.11 -116 0 0 14 57 2 2 50 42.3 50 39 -18 16 20 15 13 34 17 16 59 41 12 55 23 -0.11 -115 0 0 16 32 31 2 50 25.4 51 39 -20 17 55 39 15 9 51 18 35 3 14 31 1 -0.11 -114 0 0 18 7 2 2 50 8.2 53 40 -21 19 30 1 16 44 31 20 9 21 16 5 45 -0.11 -113 0 0 19 40 25 2 49 50.8 55 41 -22 21 3 14 18 18 7 21 42 28 17 39 26 -0.11 -112 0 0 21 12 34 2 49 33.3 57 41 -23 22 35 8 19 50 31 23 14 16 19 11 58 -0.11 -111 0 0 22 43 22 2 49 15.6 58 42 -25 24 5 38 21 21 36 24 44 38 20 43 11 -0.11 -110 0 0 24 12 41 2 48 57.9 60 43 -26 25 34 37 22 51 15 26 13 27 22 13 0 -0.12 -109 0 0 25 40 25 2 48 40.2 62 44 -27 27 1 58 24 19 22 27 40 38 23 41 19 -0.12 -108 0 0 27 6 29 2 48 22.5 63 46 -28 28 27 37 25 45 52 29 6 4 25 8 1 -0.12 -107 0 0 28 30 49 2 48 4.9 65 47 -29 29 51 28 27 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45 54 14 25 -0.12 34 0 0 55 8 49 2 33 8.6 24 312 -28 56 9 54 54 7 56 56 38 48 53 39 17 -0.12 35 0 0 54 33 25 2 33 4.7 23 313 -28 55 35 16 53 31 46 56 4 31 53 2 46 -0.12 36 0 0 53 56 36 2 33 0.7 22 314 -27 54 59 15 52 54 11 55 28 52 52 24 48 -0.12 37 0 0 53 18 20 2 32 56.8 21 315 -27 54 21 47 52 15 6 54 51 47 51 45 21 -0.12 38 0 0 52 38 32 2 32 52.9 20 316 -26 53 42 49 51 34 30 54 13 13 51 4 22 -0.12 39 0 0 51 57 10 2 32 49.1 20 316 -26 53 2 17 50 52 17 53 33 5 50 21 45 -0.12 40 0 0 51 14 9 2 32 45.4 19 317 -25 52 20 8 50 8 25 52 51 21 49 37 29 -0.12 41 0 0 50 29 26 2 32 41.7 18 318 -24 51 36 18 49 22 49 52 7 56 48 51 29 -0.12 42 0 0 49 42 57 2 32 38.1 17 319 -24 50 50 43 48 35 27 51 22 47 48 3 41 -0.12 43 0 0 48 54 38 2 32 34.6 16 319 -23 50 3 19 47 46 13 50 35 49 47 14 2 -0.12 44 0 0 48 4 25 2 32 31.2 15 320 -22 49 14 2 46 55 5 49 46 59 46 22 28 -0.12 45 0 0 47 12 14 2 32 28.0 13 321 -21 48 22 48 46 1 57 48 56 12 45 28 54 -0.12 46 0 0 46 18 2 2 32 24.9 12 322 -21 47 29 33 45 6 47 48 3 24 44 33 17 -0.13 47 0 0 45 21 43 2 32 22.0 11 322 -20 46 34 13 44 9 30 47 8 32 43 35 32 -0.13 48 0 0 44 23 14 2 32 19.3 10 323 -19 45 36 43 43 10 3 46 11 30 42 35 37 -0.13 49 0 0 43 22 31 2 32 16.8 9 324 -18 44 37 0 42 8 21 45 12 16 41 33 27 -0.13 50 0 0 42 19 31 2 32 14.6 7 324 -17 43 35 0 41 4 21 44 10 44 40 28 59 -0.13 51 0 0 41 14 9 2 32 12.6 6 325 -16 42 30 39 39 57 59 43 6 52 39 22 9 -0.14 52 0 0 40 6 23 2 32 11.0 5 326 -15 41 23 54 38 49 13 42 0 35 38 12 55 -0.15 53 0 0 38 56 9 2 32 9.8 3 326 -14 40 14 40 37 37 59 40 51 50 37 1 12 -0.17 54 0 0 37 43 25 2 32 8.9 2 327 -13 39 2 56 36 24 15 39 40 35 35 47 0 -0.22 55 0 0 36 28 8 2 32 8.5 0 328 -12 37 48 39 .. .. .. 38 26 46 .. .. .. -0.57 56 0 0 .. .. .... .. .. .. .. .. .. 36 31 47 .. .. .. 37 10 22 .. .. .. .... Uncertainty in time = +/- 5 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4 667-032641 * constellation : Auriga * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 01 10.8679 DE: +43 15 16.083 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 01 10.8679 DE: +43 15 16.083 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (117) Lomia asteroid class: approx. diameter [km]: 158 approx. diameter ["]: 0.102 distance from Earth [AU]: 2.13190 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#119 date of fit: 2022 Nov 22 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): 0.029", 0.021", 81.647° remarks: * orbital elements for (117)Lomia : Mean anomaly = 47.9998724909 deg Arg. of pericenter = 51.4858924695 deg Long. of node = 348.6330490898 deg Inclination = 14.9272613605 deg Eccentricity = 0.0235074284 Semimajor axis = 2.9894003158 AU Perihelion dist = 2.9191272018 AU Mag: H = 8.09, G = 0.15 Epoch of elements : MJD 59960.11347222 TDT (2023 Jan 16.1135) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1192022Nov22,16.99,2023,1,16,2.724174,-0.095482,0.092226,-3.649990,-3.776358,0.003720,-0.001301,0.000001,0.000000 -80.4384,43.2898,141.52,-21.01,False UCAC4 667-032641,5.01968554,43.2544675,0.00,11.42,0.00,0.0,0,,5.04730530,43.2898104,1.68,0.00,0,0,0 117,Lomia,12.84,158.1,2.1319,0,0,-1.378,-15.58,,7.8,0 0,47.9782,2023,1,16,51.4859,348.6330,14.9273,0.02351,2.98940,2.91913,8.10,5.0,0.15 1.236,0.0290,0.0207,82,0.0241,Known errors,-1.00,-1,-1,-1 20230116_032641,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org