IOTA/IOTA-ES occultation update for (1254) Erfordia / UCAC4 581-030594 event on 2024 Sep 03, 03:53 UT Visible from Summary ------- On 2024 Sep 03 UT, the 48.393 km diameter asteroid (1254) Erfordia will occult a 11.8 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.89 mag to 16.71 mag (the magnitude of the asteroid) for at most 1.650 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: 2024 Sep 03, 03:50 - 2024 Sep 03, 03:56 * geocentric midpoint of event [JD]: 2460556.66225779 * magnitude of target star: 11.83 * magnitude drop [mag]: 4.89 * estimated maximum duration [s]: 1.650 * Moon: 0 % sunlit, 64° distance * Sun: 63° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 67 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 101°) * approx speed of asteroid's shadow [km/s]: 29.3054 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 581-030594 by 1254 Erfordia on 2024 Sep 3 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 - 58 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 43 23 28 .. .. .. 43 29 59 .... - 57 0 0 43 33 29 3 51 2.3 1 54 -39 43 10 44 43 56 26 43 4 19 44 2 58 .... - 56 0 0 44 6 19 3 51 2.4 2 55 -39 43 43 31 44 29 19 43 37 5 44 35 52 -0.86 - 55 0 0 44 39 4 3 51 2.6 3 55 -38 44 16 13 45 2 7 44 9 46 45 8 41 -0.90 - 54 0 0 45 11 43 3 51 2.8 4 56 -37 44 48 48 45 34 48 44 42 20 45 41 23 -0.92 - 53 0 0 45 44 13 3 51 3.2 4 57 -37 45 21 16 46 7 22 45 14 48 46 13 58 -0.93 - 52 0 0 46 16 35 3 51 3.6 5 58 -36 45 53 36 46 39 46 45 47 6 46 46 23 -0.94 - 51 0 0 46 48 47 3 51 4.1 6 58 -36 46 25 45 47 12 0 46 19 16 47 18 37 -0.94 - 50 0 0 47 20 48 3 51 4.6 7 59 -35 46 57 44 47 44 3 46 51 14 47 50 40 -0.95 - 49 0 0 47 52 36 3 51 5.2 8 60 -34 47 29 31 48 15 53 47 23 0 48 22 31 -0.95 - 48 0 0 48 24 11 3 51 5.9 9 61 -34 48 1 4 48 47 29 47 54 33 48 54 8 -0.95 - 47 0 0 48 55 32 3 51 6.6 10 61 -33 48 32 24 49 18 51 48 25 52 49 25 30 -0.95 - 46 0 0 49 26 37 3 51 7.4 10 62 -32 49 3 28 49 49 57 48 56 56 49 56 36 -0.96 - 45 0 0 49 57 25 3 51 8.2 11 63 -32 49 34 16 50 20 46 49 27 44 50 27 25 -0.96 - 44 0 0 50 27 56 3 51 9.1 12 64 -31 50 4 47 50 51 17 49 58 15 50 57 57 -0.96 - 43 0 0 50 58 9 3 51 10.0 13 65 -30 50 34 59 51 21 30 50 28 27 51 28 9 -0.96 - 42 0 0 51 28 2 3 51 11.0 14 65 -30 51 4 53 51 51 23 50 58 21 51 58 2 -0.96 - 41 0 0 51 57 36 3 51 12.0 14 66 -29 51 34 27 52 20 56 51 27 55 52 27 35 -0.96 - 40 0 0 52 26 48 3 51 13.1 15 67 -28 52 3 40 52 50 8 51 57 9 52 56 47 -0.96 - 39 0 0 52 55 39 3 51 14.2 16 68 -28 52 32 32 53 18 57 52 26 1 53 25 36 -0.96 - 38 0 0 53 24 8 3 51 15.3 17 69 -27 53 1 2 53 47 25 52 54 31 53 54 3 -0.96 - 37 0 0 53 52 13 3 51 16.5 17 70 -26 53 29 9 54 15 29 53 22 39 54 22 6 -0.96 - 36 0 0 54 19 55 3 51 17.7 18 70 -26 53 56 53 54 43 9 53 50 23 54 49 46 -0.96 - 35 0 0 54 47 14 3 51 18.9 19 71 -25 54 24 13 55 10 25 54 17 44 55 17 2 -0.96 - 34 0 0 55 14 7 3 51 20.2 19 72 -24 54 51 9 55 37 16 54 44 41 55 43 52 -0.96 - 33 0 0 55 40 36 3 51 21.5 20 73 -24 55 17 41 56 3 42 55 11 13 56 10 17 -0.96 - 32 0 0 56 6 39 3 51 22.8 21 74 -23 55 43 47 56 29 43 55 37 19 56 36 17 -0.96 - 31 0 0 56 32 16 3 51 24.2 21 75 -22 56 9 27 56 55 17 56 3 1 57 1 50 -0.96 - 30 0 0 56 57 28 3 51 25.5 22 76 -22 56 34 42 57 20 25 56 28 16 57 26 57 -0.96 - 29 0 0 57 22 13 3 51 26.9 23 77 -21 56 59 30 57 45 6 56 53 6 57 51 38 -0.96 - 28 0 0 57 46 31 3 51 28.3 23 78 -21 57 23 52 58 9 21 57 17 29 58 15 51 -0.96 - 27 0 0 58 10 23 3 51 29.7 24 79 -20 57 47 48 58 33 9 57 41 25 58 39 38 -0.97 - 26 0 0 58 33 48 3 51 31.2 25 80 -19 58 11 17 58 56 29 58 4 55 59 2 57 -0.97 - 25 0 0 58 56 46 3 51 32.6 25 81 -19 58 34 19 59 19 23 58 27 59 59 25 50 -0.97 - 24 0 0 59 19 16 3 51 34.1 26 82 -18 58 56 54 59 41 49 58 50 35 59 48 15 -0.97 - 23 0 0 59 41 20 3 51 35.5 26 83 -17 59 19 2 60 3 49 59 12 45 60 10 13 -0.97 - 22 0 0 60 2 57 3 51 37.0 27 84 -17 59 40 44 60 25 21 59 34 27 60 31 43 -0.97 - 21 0 0 60 24 7 3 51 38.5 27 85 -16 60 1 58 60 46 26 59 55 43 60 52 47 -0.97 - 20 0 0 60 44 50 3 51 40.0 28 86 -16 60 22 46 61 7 3 60 16 32 61 13 23 -0.97 - 19 0 0 61 5 6 3 51 41.4 28 87 -15 60 43 7 61 27 14 60 36 55 61 33 33 -0.97 - 18 0 0 61 24 55 3 51 42.9 29 88 -15 61 3 1 61 46 58 60 56 51 61 53 15 -0.97 - 17 0 0 61 44 18 3 51 44.4 29 89 -14 61 22 29 62 6 16 61 16 20 62 12 31 -0.97 - 16 0 0 62 3 14 3 51 45.9 30 90 -13 61 41 31 62 25 7 61 35 23 62 31 21 -0.97 - 15 0 0 62 21 44 3 51 47.4 30 91 -13 62 0 7 62 43 32 61 54 0 62 49 44 -0.97 - 14 0 0 62 39 49 3 51 48.9 31 92 -12 62 18 16 63 1 31 62 12 11 63 7 41 -0.97 - 13 0 0 62 57 27 3 51 50.4 31 93 -12 62 36 0 63 19 4 62 29 57 63 25 13 -0.97 - 12 0 0 63 14 41 3 51 51.9 32 94 -11 62 53 19 63 36 11 62 47 17 63 42 19 -0.97 - 11 0 0 63 31 29 3 51 53.4 32 96 -11 63 10 12 63 52 54 63 4 12 63 59 0 -0.97 - 10 0 0 63 47 52 3 51 54.8 32 97 -10 63 26 41 64 9 11 63 20 42 64 15 16 -0.97 - 9 0 0 64 3 50 3 51 56.3 33 98 -10 63 42 45 64 25 4 63 36 48 64 31 7 -0.97 - 8 0 0 64 19 24 3 51 57.8 33 99 -9 63 58 25 64 40 33 63 52 29 64 46 34 -0.97 - 7 0 0 64 34 34 3 51 59.3 34 100 -9 64 13 40 64 55 37 64 7 46 65 1 37 -0.97 - 6 0 0 64 49 21 3 52 0.7 34 101 -8 64 28 32 65 10 18 64 22 40 65 16 16 -0.97 - 5 0 0 65 3 44 3 52 2.2 34 102 -8 64 43 1 65 24 35 64 37 10 65 30 32 -0.97 - 4 0 0 65 17 44 3 52 3.6 35 103 -7 64 57 6 65 38 30 64 51 17 65 44 24 -0.97 - 3 0 0 65 31 21 3 52 5.1 35 105 -7 65 10 49 65 52 1 65 5 1 65 57 54 -0.97 - 2 0 0 65 44 36 3 52 6.5 35 106 -6 65 24 9 66 5 11 65 18 22 66 11 2 -0.97 - 1 0 0 65 57 28 3 52 7.9 36 107 -6 65 37 7 66 17 58 65 31 22 66 23 48 -0.97 0 0 0 66 9 59 3 52 9.4 36 108 -5 65 49 43 66 30 23 65 43 59 66 36 12 -0.97 1 0 0 66 22 9 3 52 10.8 36 109 -5 66 1 58 66 42 27 65 56 16 66 48 14 -0.97 2 0 0 66 33 57 3 52 12.2 37 110 -5 66 13 51 66 54 10 66 8 11 66 59 56 -0.97 3 0 0 66 45 24 3 52 13.6 37 111 -4 66 25 24 67 5 33 66 19 45 67 11 17 -0.97 4 0 0 66 56 32 3 52 15.0 37 113 -4 66 36 36 67 16 35 66 30 58 67 22 17 -0.97 5 0 0 67 7 18 3 52 16.4 38 114 -3 66 47 28 67 27 16 66 41 51 67 32 57 -0.97 6 0 0 67 17 45 3 52 17.8 38 115 -3 66 57 59 67 37 39 66 52 25 67 43 18 -0.97 7 0 0 67 27 53 3 52 19.2 38 116 -2 67 8 12 67 47 41 67 2 38 67 53 19 -0.97 8 0 0 67 37 41 3 52 20.5 38 117 -2 67 18 5 67 57 25 67 12 32 68 3 1 -0.97 9 0 0 67 47 10 3 52 21.9 39 119 -2 67 27 39 68 6 49 67 22 8 68 12 25 -0.97 10 0 0 67 56 21 3 52 23.3 39 120 -1 67 36 54 68 15 55 67 31 24 68 21 30 -0.97 11 0 0 68 5 13 3 52 24.6 39 121 -1 67 45 50 68 24 43 67 40 22 68 30 16 -0.97 12 0 0 68 13 48 3 52 26.0 39 122 0 67 54 29 68 33 13 67 49 2 68 38 45 -0.97 13 0 0 68 22 4 3 52 27.3 40 123 0 68 2 50 68 41 25 67 57 23 68 46 56 -0.97 14 0 0 68 30 3 3 52 28.6 40 124 0 68 10 53 68 49 20 68 5 28 68 54 49 -0.97 15 0 0 68 37 45 3 52 30.0 40 126 1 68 18 38 68 56 57 68 13 14 69 2 26 -0.97 16 0 0 68 45 9 3 52 31.3 40 127 1 68 26 7 69 4 18 68 20 44 69 9 45 -0.97 17 0 0 68 52 17 3 52 32.6 41 128 2 68 33 18 69 11 22 68 27 57 69 16 48 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3 52 50.6 43 145 7 69 46 23 70 23 6 69 41 13 70 28 20 -0.97 32 0 0 70 8 2 3 52 51.8 43 147 7 69 49 45 70 26 24 69 44 35 70 31 38 -0.97 33 0 0 70 11 8 3 52 53.1 43 148 7 69 52 53 70 29 28 69 47 43 70 34 41 -0.97 34 0 0 70 14 0 3 52 54.3 44 149 8 69 55 47 70 32 19 69 50 38 70 37 31 -0.97 35 0 0 70 16 38 3 52 55.6 44 150 8 69 58 27 70 34 56 69 53 18 70 40 8 -0.97 36 0 0 70 19 3 3 52 56.8 44 152 8 70 0 53 70 37 19 69 55 45 70 42 31 -0.97 37 0 0 70 21 14 3 52 58.1 44 153 9 70 3 5 70 39 29 69 57 57 70 44 40 -0.97 38 0 0 70 23 12 3 52 59.3 44 154 9 70 5 4 70 41 25 69 59 57 70 46 36 -0.97 39 0 0 70 24 56 3 53 0.6 44 155 9 70 6 49 70 43 9 70 1 42 70 48 19 -0.97 40 0 0 70 26 27 3 53 1.8 44 157 10 70 8 21 70 44 39 70 3 14 70 49 49 -0.97 41 0 0 70 27 45 3 53 3.1 44 158 10 70 9 40 70 45 56 70 4 33 70 51 6 -0.97 42 0 0 70 28 49 3 53 4.3 44 159 10 70 10 45 70 46 59 70 5 38 70 52 9 -0.97 43 0 0 70 29 40 3 53 5.6 45 160 11 70 11 36 70 47 50 70 6 30 70 53 0 -0.97 44 0 0 70 30 18 3 53 6.8 45 162 11 70 12 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55 13 70 41 59 -0.97 58 0 0 70 16 3 3 53 24.6 46 180 16 69 57 51 70 34 21 69 52 43 70 39 33 -0.97 59 0 0 70 13 22 3 53 25.9 46 181 16 69 55 8 70 31 41 69 49 59 70 36 53 -0.97 60 0 0 70 10 26 3 53 27.2 46 182 16 69 52 11 70 28 47 69 47 2 70 34 0 -0.97 61 0 0 70 7 17 3 53 28.5 46 184 17 69 49 0 70 25 40 69 43 50 70 30 53 -0.97 62 0 0 70 3 54 3 53 29.8 46 185 17 69 45 35 70 22 18 69 40 24 70 27 33 -0.97 63 0 0 70 0 16 3 53 31.2 46 186 17 69 41 55 70 18 43 69 36 44 70 23 58 -0.97 64 0 0 69 56 25 3 53 32.5 46 187 18 69 38 2 70 14 54 69 32 50 70 20 9 -0.97 65 0 0 69 52 19 3 53 33.8 46 189 18 69 33 53 70 10 50 69 28 41 70 16 6 -0.97 66 0 0 69 47 58 3 53 35.2 46 190 18 69 29 30 70 6 32 69 24 17 70 11 49 -0.97 67 0 0 69 43 23 3 53 36.5 46 191 19 69 24 53 70 2 0 69 19 39 70 7 17 -0.97 68 0 0 69 38 33 3 53 37.9 46 193 19 69 20 0 69 57 13 69 14 46 70 2 31 -0.97 69 0 0 69 33 28 3 53 39.3 46 194 19 69 14 52 69 52 10 69 9 37 69 57 30 -0.97 70 0 0 69 28 8 3 53 40.7 46 195 20 69 9 29 69 46 53 69 4 13 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47 31 -0.99 136 0 0 50 47 21 3 55 40.6 27 279 45 50 24 10 51 10 43 50 17 38 51 17 23 -0.99 137 0 0 50 16 54 3 55 42.5 26 280 45 49 53 43 50 40 16 49 47 11 50 46 56 -0.99 138 0 0 49 46 8 3 55 44.4 26 281 45 49 22 57 50 9 30 49 16 25 50 16 9 -0.99 139 0 0 49 15 5 3 55 46.3 25 282 46 48 51 55 49 38 26 48 45 23 49 45 6 -0.99 140 0 0 48 43 45 3 55 48.1 24 283 46 48 20 36 49 7 6 48 14 5 49 13 45 -0.99 141 0 0 48 12 10 3 55 49.9 23 284 46 47 49 3 48 35 30 47 42 31 48 42 8 -0.99 142 0 0 47 40 21 3 55 51.7 22 284 46 47 17 15 48 3 39 47 10 44 48 10 17 -1.00 143 0 0 47 8 18 3 55 53.4 22 285 46 46 45 14 47 31 34 46 38 43 47 38 12 -1.00 144 0 0 46 36 4 3 55 55.1 21 286 46 46 13 1 46 59 18 46 6 31 47 5 55 -1.00 145 0 0 46 3 38 3 55 56.8 20 287 46 45 40 37 46 26 50 45 34 8 46 33 26 -1.00 146 0 0 45 31 2 3 55 58.3 19 288 46 45 8 4 45 54 12 45 1 35 46 0 48 -1.00 147 0 0 44 58 18 3 55 59.9 18 289 46 44 35 23 45 21 25 44 28 55 45 28 0 -1.00 148 0 0 44 25 27 3 56 1.3 18 289 46 44 2 34 44 48 30 43 56 7 44 55 5 -1.01 149 0 0 43 52 30 3 56 2.8 17 290 46 43 29 40 44 15 30 43 23 14 44 22 4 -1.01 150 0 0 43 19 27 3 56 4.1 16 291 46 42 56 41 43 42 25 42 50 15 43 48 57 -1.01 151 0 0 42 46 21 3 56 5.4 15 292 46 42 23 38 43 9 14 42 17 14 43 15 46 -1.01 152 0 0 42 13 12 3 56 6.6 14 292 46 41 50 33 42 36 2 41 44 10 42 42 32 -1.02 153 0 0 41 40 3 3 56 7.8 13 293 45 41 17 28 42 2 49 41 11 6 42 9 18 -1.02 154 0 0 41 6 54 3 56 8.9 12 294 45 40 44 23 41 29 35 40 38 2 41 36 3 -1.03 155 0 0 40 33 46 3 56 9.9 11 295 45 40 11 20 40 56 23 40 5 0 41 2 50 -1.03 156 0 0 40 0 41 3 56 10.8 10 295 45 39 38 19 40 23 14 39 32 0 40 29 39 -1.04 157 0 0 39 27 41 3 56 11.7 9 296 44 39 5 23 39 50 9 38 59 5 39 56 33 -1.04 158 0 0 38 54 45 3 56 12.5 8 297 44 38 32 32 39 17 8 38 26 16 39 23 31 -1.05 159 0 0 38 21 56 3 56 13.2 8 297 44 37 59 48 38 44 14 37 53 33 38 50 36 -1.06 160 0 0 37 49 15 3 56 13.8 7 298 43 37 27 11 38 11 28 37 20 58 38 17 48 -1.08 161 0 0 37 16 43 3 56 14.4 6 298 43 36 54 44 37 38 51 36 48 32 37 45 9 -1.10 162 0 0 36 44 21 3 56 14.8 5 299 42 36 22 27 37 6 24 36 16 17 37 12 41 -1.12 163 0 0 36 12 10 3 56 15.2 4 300 42 35 50 22 36 34 8 35 44 13 36 40 23 -1.16 164 0 0 35 40 12 3 56 15.5 3 300 41 35 18 29 36 2 4 35 12 21 36 8 18 -1.23 165 0 0 35 8 27 3 56 15.7 2 301 41 34 46 50 35 30 14 34 40 44 35 36 27 -1.38 166 0 0 34 36 58 3 56 15.8 1 301 40 34 15 25 34 58 39 34 9 21 35 4 50 -1.89 167 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 34 33 29 .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: UCAC4 581-030594 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 36 13.5137 DE: +26 00 08.715 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 36 13.5138 DE: +26 00 08.715 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1254) Erfordia asteroid class: approx. diameter [km]: 48 approx. diameter ["]: 0.019 distance from Earth [AU]: 3.47100 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 date of fit: 2023 Feb 11 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): 0.016", 0.002", 100.528° remarks: * orbital elements for (1254)Erfordia : Mean anomaly = 273.3722057106 deg Arg. of pericenter = 243.4144806049 deg Long. of node = 287.5261322281 deg Inclination = 7.0841675545 deg Eccentricity = 0.0257684490 Semimajor axis = 3.1418027533 AU Perihelion dist = 3.0608433691 AU Mag: H = 10.64, G = 0.15 Epoch of elements : MJD 60556.16225688 TDT (2024 Sep 03.1623) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Feb11,1.65,2024,9,3,3.894187,0.064454,0.688467,16.469811,-1.530940,-0.005093,0.000462,-0.000001,0.000000 58.2412,25.9829,121.42,7.38,False UCAC4 581-030594,6.60375377,26.0024208,12.44,11.83,11.50,0.0,0,,6.62903096,25.9829100,4.90,4.78,0,0,0 1254,Erfordia,16.71,48.393,3.4710,0,0,3.095,-3.88,,2.4,0 0,273.3435,2024,9,3,243.4145,287.5261,7.0842,0.02577,3.14180,3.06084,10.64,5.0,0.15 1.142,0.0157,0.0023,101,0.0027,Known errors,1.01,0,-1,-1 20240903_030594,60140.54 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 12:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org