IOTA/IOTA-ES occultation update for (117) Lomia / UCAC4 656-027177 event on 2023 Feb 05, 03:41 UT Visible from Canada, W USA, Mexico Summary ------- On 2023 Feb 05 UT, the 158.1 km diameter asteroid (117) Lomia will occult a 12.4 mag star in the constellation Auriga for observers along a path across Canada, W USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.20 mag to 13.18 mag (the magnitude of the asteroid) for at most 20.540 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: 99 * date and approx. time of event: 2023 Feb 05, 03:27 - 2023 Feb 05, 03:55 * geocentric midpoint of event [JD]: 2459980.65372333 * magnitude of target star: 12.41 * magnitude drop [mag]: 1.20 * estimated maximum duration [s]: 20.540 * Moon: 99 % sunlit, 51° distance * Sun: 120° distance * rough path description: Canada, W USA, Mexico The occultation path -------------------- * approximate projected width [km]: 158 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.019) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.019", 81°) * approx speed of asteroid's shadow [km/s]: 7.6985 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 656-027177 by 117 Lomia on 2023 Feb 5 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 - 98 46 31 -47 0 0 3 55 7.9 0 345 -16 - 99 51 12 - 97 41 32 -100 27 25 ... .. .. .... - 99 9 53 -46 0 0 3 55 7.8 1 345 -17 -100 13 17 - 98 6 12 -100 48 48 - 97 30 16 -0.09 - 99 32 16 -45 0 0 3 55 7.4 2 345 -17 -100 34 28 - 98 29 48 -101 9 19 - 97 54 34 -0.09 - 99 53 43 -44 0 0 3 55 6.7 3 346 -18 -100 54 47 - 98 52 24 -101 29 0 - 98 17 50 -0.08 -100 14 19 -43 0 0 3 55 5.7 4 346 -18 -101 14 18 - 99 14 5 -101 47 55 - 98 40 8 -0.08 -100 34 5 -42 0 0 3 55 4.5 5 346 -19 -101 33 3 - 99 34 54 -102 6 6 - 99 1 31 -0.08 -100 53 6 -41 0 0 3 55 3.1 6 346 -19 -101 51 6 - 99 54 53 -102 23 37 - 99 22 4 -0.08 -101 11 24 -40 0 0 3 55 1.3 7 346 -20 -102 8 29 -100 14 7 -102 40 29 - 99 41 49 -0.08 -101 29 1 -39 0 0 3 54 59.3 8 347 -20 -102 25 14 -100 32 37 -102 56 45 -100 0 49 -0.08 -101 46 0 -38 0 0 3 54 57.1 9 347 -21 -102 41 24 -100 50 25 -103 12 27 -100 19 6 -0.08 -102 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14 59 -110 6 2 -107 50 36 -0.07 -109 4 20 9 0 0 3 48 52.4 57 348 -36 -109 47 46 -108 20 52 -110 12 10 -107 56 25 -0.07 -109 10 17 10 0 0 3 48 40.1 58 348 -36 -109 53 51 -108 26 42 -110 18 19 -108 2 11 -0.07 -109 16 13 11 0 0 3 48 27.7 59 348 -36 -109 59 55 -108 32 30 -110 24 28 -108 7 55 -0.07 -109 22 9 12 0 0 3 48 15.2 60 348 -36 -110 5 59 -108 38 16 -110 30 37 -108 13 36 -0.07 -109 28 3 13 0 0 3 48 2.5 61 348 -36 -110 12 4 -108 44 1 -110 36 48 -108 19 16 -0.07 -109 33 58 14 0 0 3 47 49.8 62 347 -36 -110 18 10 -108 49 46 -110 42 59 -108 24 54 -0.07 -109 39 54 15 0 0 3 47 36.9 63 347 -36 -110 24 17 -108 55 29 -110 49 13 -108 30 31 -0.06 -109 45 50 16 0 0 3 47 23.8 64 347 -36 -110 30 26 -109 1 13 -110 55 29 -108 36 8 -0.06 -109 51 47 17 0 0 3 47 10.7 65 347 -36 -110 36 37 -109 6 57 -111 1 48 -108 41 44 -0.06 -109 57 47 18 0 0 3 46 57.5 66 347 -36 -110 42 51 -109 12 42 -111 8 10 -108 47 21 -0.06 -110 3 48 19 0 0 3 46 44.1 67 346 -36 -110 49 8 -109 18 28 -111 14 36 -108 52 58 -0.06 -110 9 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34 -117 30 55 -113 41 25 -0.03 -115 54 7 55 0 0 3 38 8.2 76 177 -27 -117 9 34 -114 38 53 -117 52 5 -113 56 41 -0.03 -116 13 23 56 0 0 3 37 53.8 75 176 -27 -117 30 52 -114 56 9 -118 14 31 -114 12 50 -0.03 -116 33 50 57 0 0 3 37 39.5 74 175 -27 -117 53 28 -115 14 27 -118 38 22 -114 29 56 -0.03 -116 55 34 58 0 0 3 37 25.3 73 174 -26 -118 17 32 -115 33 53 -119 3 45 -114 48 6 -0.03 -117 18 43 59 0 0 3 37 11.1 72 174 -26 -118 43 11 -115 54 35 -119 30 49 -115 7 26 -0.03 -117 43 27 60 0 0 3 36 57.0 71 173 -25 -119 10 36 -116 16 40 -119 59 46 -115 28 3 -0.03 -118 9 55 61 0 0 3 36 42.9 70 172 -25 -119 39 58 -116 40 17 -120 30 47 -115 50 5 -0.03 -118 38 19 62 0 0 3 36 28.9 69 171 -24 -120 11 30 -117 5 37 -121 4 7 -116 13 41 -0.03 -119 8 53 63 0 0 3 36 15.0 68 170 -24 -120 45 29 -117 32 50 -121 40 2 -116 39 4 -0.03 Latitude Latitude Latitude Latitude -120 0 0 64 31 5 3 35 54.0 66 169 -23 61 38 37 67 21 14 60 0 28 68 56 3 -0.03 -121 0 0 66 5 23 3 35 32.4 65 168 -22 63 24 19 68 44 34 61 52 49 70 13 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33 49 60 26 55 -0.09 83 0 0 51 59 54 3 27 37.3 4 12 10 48 21 53 55 42 40 .. .. .. 57 50 9 -0.12 82 0 0 48 40 54 3 27 35.3 0 11 12 .. .. .. 52 35 19 .. .. .. 54 50 5 -0.46 81 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 49 2 28 .. .. .. 51 24 0 .... Uncertainty in time = +/- 6 secs Prediction of 2022 Dec 13.0 Data for the target star ------------------------ * name: UCAC4 656-027177 * constellation : Auriga * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 56 55.6348 DE: +41 04 54.892 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 56 55.6346 DE: +41 04 54.893 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (117) Lomia asteroid class: approx. diameter [km]: 158 approx. diameter ["]: 0.094 distance from Earth [AU]: 2.32750 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): 0.026", 0.019", 81.082° remarks: * orbital elements for (117)Lomia : Mean anomaly = 51.7811739102 deg Arg. of pericenter = 51.5274658134 deg Long. of node = 348.6332467646 deg Inclination = 14.9272490148 deg Eccentricity = 0.0235029268 Semimajor axis = 2.9894312944 AU Perihelion dist = 2.9191709097 AU Mag: H = 8.09, G = 0.15 Epoch of elements : MJD 59980.15375000 TDT (2023 Feb 05.1538) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1192022Nov22,20.54,2023,2,5,3.689360,0.037303,0.007554,0.874887,-4.256278,0.005126,-0.000419,0.000001,0.000000 -115.7426,41.1200,128.14,-16.02,False UCAC4 656-027177,4.94878747,41.0819146,0.00,12.41,0.00,0.0,0,,4.97573805,41.1199518,1.20,0.00,0,0,0 117,Lomia,13.18,158.1,2.3275,0,0,0.294,-16.08,,7.8,0 0,51.7519,2023,2,5,51.5275,348.6332,14.9272,0.02350,2.98943,2.91917,8.10,5.0,0.15 1.281,0.0263,0.0187,81,0.0263,Known errors,-1.00,-1,-1,-1 20230205_027177,59926.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 13, 00:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org