IOTA/IOTA-ES occultation update for (4245) Nairc / UCAC4 325-122167 event on 2024 Oct 21, 17:15 UT Visible from Summary ------- On 2024 Oct 21 UT, the 10.448 km diameter asteroid (4245) Nairc will occult a 11.3 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.81 mag to 19.06 mag (the magnitude of the asteroid) for at most 0.330 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 Oct 21, 17:12 - 2024 Oct 21, 17:17 * geocentric midpoint of event [JD]: 2460605.21889229 * magnitude of target star: 11.25 * magnitude drop [mag]: 7.81 * estimated maximum duration [s]: 0.330 * Moon: 76 % sunlit, 176° distance * Sun: 60° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.001", 91°) * approx speed of asteroid's shadow [km/s]: 31.9730 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 325-122167 by 4245 Nairc on 2024 Oct 21 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 - 92 0 0 32 27 13 17 12 34.0 0 120 46 32 23 7 32 31 20 32 21 54 32 32 33 .... - 91 0 0 31 57 48 17 12 34.1 1 121 46 31 53 43 32 1 54 31 52 29 32 3 8 -0.34 - 90 0 0 31 28 29 17 12 34.2 2 121 47 31 24 24 31 32 34 31 23 10 31 33 47 -0.51 - 89 0 0 30 59 16 17 12 34.4 3 122 48 30 55 12 31 3 21 30 53 59 31 4 34 -0.58 - 88 0 0 30 30 11 17 12 34.7 4 122 48 30 26 7 30 34 15 30 24 54 30 35 28 -0.62 - 87 0 0 30 1 15 17 12 35.1 5 123 49 29 57 11 30 5 18 29 55 59 30 6 31 -0.65 - 86 0 0 29 32 28 17 12 35.5 6 123 49 29 28 25 29 36 31 29 27 13 29 37 44 -0.67 - 85 0 0 29 3 52 17 12 36.0 7 124 50 28 59 50 29 7 54 28 58 37 29 9 7 -0.68 - 84 0 0 28 35 27 17 12 36.6 8 124 50 28 31 25 28 39 29 28 30 13 28 40 41 -0.69 - 83 0 0 28 7 14 17 12 37.3 9 125 51 28 3 13 28 11 15 28 2 1 28 12 27 -0.70 - 82 0 0 27 39 14 17 12 38.0 10 125 51 27 35 14 27 43 15 27 34 2 27 44 27 -0.70 - 81 0 0 27 11 29 17 12 38.8 11 126 52 27 7 29 27 15 29 27 6 17 27 16 41 -0.71 - 80 0 0 26 43 58 17 12 39.7 12 126 52 26 39 59 26 47 57 26 38 47 26 49 9 -0.71 - 79 0 0 26 16 43 17 12 40.7 13 127 53 26 12 44 26 20 41 26 11 33 26 21 53 -0.71 - 78 0 0 25 49 44 17 12 41.8 14 127 53 25 45 46 25 53 42 25 44 35 25 54 53 -0.72 - 77 0 0 25 23 2 17 12 42.9 15 128 53 25 19 5 25 27 0 25 17 54 25 28 11 -0.72 - 76 0 0 24 56 39 17 12 44.1 16 128 54 24 52 42 25 0 35 24 51 32 25 1 46 -0.72 - 75 0 0 24 30 34 17 12 45.3 17 129 54 24 26 38 24 34 30 24 25 28 24 35 40 -0.73 - 74 0 0 24 4 48 17 12 46.7 18 129 54 24 0 53 24 8 44 23 59 43 24 9 54 -0.73 - 73 0 0 23 39 23 17 12 48.1 19 130 54 23 35 29 23 43 18 23 34 18 23 44 28 -0.73 - 72 0 0 23 14 18 17 12 49.6 20 130 54 23 10 25 23 18 12 23 9 15 23 19 22 -0.73 - 71 0 0 22 49 35 17 12 51.2 21 131 55 22 45 42 22 53 29 22 44 33 22 54 39 -0.73 - 70 0 0 22 25 14 17 12 52.8 22 131 55 22 21 22 22 29 7 22 20 13 22 30 17 -0.73 - 69 0 0 22 1 16 17 12 54.5 23 132 55 21 57 24 22 5 8 21 56 15 22 6 18 -0.74 - 68 0 0 21 37 41 17 12 56.3 24 132 55 21 33 50 21 41 33 21 32 41 21 42 42 -0.74 - 67 0 0 21 14 30 17 12 58.1 25 133 55 21 10 40 21 18 21 21 9 31 21 19 30 -0.74 - 66 0 0 20 51 44 17 13 0.0 26 133 54 20 47 54 20 55 34 20 46 46 20 56 43 -0.74 - 65 0 0 20 29 23 17 13 2.0 27 134 54 20 25 34 20 33 12 20 24 25 20 34 21 -0.74 - 64 0 0 20 7 27 17 13 4.0 28 134 54 20 3 38 20 11 16 20 2 30 20 12 24 -0.74 - 63 0 0 19 45 57 17 13 6.1 29 135 54 19 42 9 19 49 45 19 41 1 19 50 54 -0.74 - 62 0 0 19 24 54 17 13 8.3 30 136 54 19 21 7 19 28 41 19 19 59 19 29 49 -0.74 - 61 0 0 19 4 18 17 13 10.5 31 136 53 19 0 31 19 8 4 18 59 23 19 9 12 -0.74 - 60 0 0 18 44 9 17 13 12.8 31 137 53 18 40 23 18 47 55 18 39 15 18 49 3 -0.75 - 59 0 0 18 24 28 17 13 15.1 32 137 53 18 20 42 18 28 13 18 19 35 18 29 21 -0.75 - 58 0 0 18 5 15 17 13 17.5 33 138 52 18 1 30 18 9 0 18 0 23 18 10 7 -0.75 - 57 0 0 17 46 31 17 13 20.0 34 139 52 17 42 46 17 50 15 17 41 39 17 51 22 -0.75 - 56 0 0 17 28 15 17 13 22.5 35 139 52 17 24 32 17 31 59 17 23 25 17 33 6 -0.75 - 55 0 0 17 10 30 17 13 25.0 36 140 51 17 6 46 17 14 13 17 5 40 17 15 20 -0.75 - 54 0 0 16 53 13 17 13 27.6 37 141 51 16 49 31 16 56 56 16 48 24 16 58 3 -0.75 - 53 0 0 16 36 27 17 13 30.3 37 142 50 16 32 45 16 40 9 16 31 39 16 41 16 -0.75 - 52 0 0 16 20 11 17 13 33.0 38 142 49 16 16 30 16 23 53 16 15 23 16 24 59 -0.75 - 51 0 0 16 4 26 17 13 35.7 39 143 49 16 0 45 16 8 7 15 59 39 16 9 13 -0.75 - 50 0 0 15 49 11 17 13 38.5 40 144 48 15 45 31 15 52 52 15 44 25 15 53 58 -0.75 - 49 0 0 15 34 28 17 13 41.4 41 145 48 15 30 47 15 38 8 15 29 42 15 39 14 -0.75 - 48 0 0 15 20 15 17 13 44.3 41 145 47 15 16 36 15 23 55 15 15 30 15 25 1 -0.75 - 47 0 0 15 6 35 17 13 47.2 42 146 46 15 2 55 15 10 14 15 1 50 15 11 20 -0.75 - 46 0 0 14 53 26 17 13 50.1 43 147 46 14 49 47 14 57 5 14 48 41 14 58 10 -0.75 - 45 0 0 14 40 49 17 13 53.1 44 148 45 14 37 10 14 44 27 14 36 5 14 45 33 -0.76 - 44 0 0 14 28 44 17 13 56.2 44 149 44 14 25 6 14 32 22 14 24 0 14 33 27 -0.76 - 43 0 0 14 17 11 17 13 59.2 45 150 44 14 13 33 14 20 49 14 12 28 14 21 54 -0.76 - 42 0 0 14 6 11 17 14 2.3 45 151 43 14 2 34 14 9 49 14 1 29 14 10 54 -0.76 - 41 0 0 13 55 43 17 14 5.5 46 152 42 13 52 6 13 59 21 13 51 2 14 0 26 -0.76 - 40 0 0 13 45 49 17 14 8.6 47 153 41 13 42 12 13 49 25 13 41 7 13 50 30 -0.76 - 39 0 0 13 36 27 17 14 11.8 47 154 40 13 32 50 13 40 3 13 31 46 13 41 8 -0.76 - 38 0 0 13 27 38 17 14 15.1 48 156 40 13 24 2 13 31 14 13 22 57 13 32 19 -0.76 - 37 0 0 13 19 22 17 14 18.3 48 157 39 13 15 46 13 22 58 13 14 41 13 24 2 -0.76 - 36 0 0 13 11 39 17 14 21.6 49 158 38 13 8 4 13 15 15 13 6 59 13 16 19 -0.76 - 35 0 0 13 4 30 17 14 24.9 49 159 37 13 0 54 13 8 5 12 59 50 13 9 10 -0.76 - 34 0 0 12 57 54 17 14 28.2 50 160 36 12 54 19 13 1 29 12 53 14 13 2 34 -0.76 - 33 0 0 12 51 51 17 14 31.5 50 162 35 12 48 16 12 55 26 12 47 12 12 56 31 -0.76 - 32 0 0 12 46 22 17 14 34.9 51 163 35 12 42 48 12 49 57 12 41 43 12 51 2 -0.76 - 31 0 0 12 41 27 17 14 38.2 51 164 34 12 37 52 12 45 2 12 36 48 12 46 6 -0.76 - 30 0 0 12 37 5 17 14 41.6 51 166 33 12 33 31 12 40 40 12 32 27 12 41 44 -0.76 - 29 0 0 12 33 17 17 14 45.0 52 167 32 12 29 43 12 36 52 12 28 39 12 37 56 -0.76 - 28 0 0 12 30 3 17 14 48.4 52 169 31 12 26 29 12 33 37 12 25 25 12 34 41 -0.76 - 27 0 0 12 27 22 17 14 51.8 52 170 30 12 23 48 12 30 57 12 22 44 12 32 1 -0.76 - 26 0 0 12 25 16 17 14 55.3 52 172 29 12 21 42 12 28 50 12 20 38 12 29 54 -0.76 - 25 0 0 12 23 43 17 14 58.7 52 173 28 12 20 9 12 27 17 12 19 5 12 28 21 -0.76 - 24 0 0 12 22 44 17 15 2.1 52 175 27 12 19 10 12 26 18 12 18 6 12 27 22 -0.76 - 23 0 0 12 22 19 17 15 5.6 53 176 26 12 18 45 12 25 53 12 17 41 12 26 57 -0.76 - 22 0 0 12 22 28 17 15 9.0 53 178 25 12 18 54 12 26 2 12 17 50 12 27 6 -0.76 - 21 0 0 12 23 10 17 15 12.5 53 179 24 12 19 36 12 26 45 12 18 32 12 27 49 -0.76 - 20 0 0 12 24 27 17 15 15.9 53 181 24 12 20 53 12 28 1 12 19 49 12 29 5 -0.76 - 19 0 0 12 26 17 17 15 19.4 53 182 23 12 22 43 12 29 52 12 21 39 12 30 56 -0.76 - 18 0 0 12 28 42 17 15 22.8 52 184 22 12 25 7 12 32 16 12 24 3 12 33 20 -0.76 - 17 0 0 12 31 40 17 15 26.3 52 185 21 12 28 5 12 35 14 12 27 1 12 36 18 -0.76 - 16 0 0 12 35 11 17 15 29.7 52 187 20 12 31 37 12 38 46 12 30 33 12 39 50 -0.76 - 15 0 0 12 39 17 17 15 33.1 52 188 19 12 35 42 12 42 52 12 34 38 12 43 56 -0.76 - 14 0 0 12 43 56 17 15 36.5 52 190 18 12 40 22 12 47 31 12 39 17 12 48 35 -0.76 - 13 0 0 12 49 9 17 15 40.0 52 191 17 12 45 34 12 52 44 12 44 30 12 53 49 -0.76 - 12 0 0 12 54 56 17 15 43.4 51 192 16 12 51 21 12 58 31 12 50 16 12 59 35 -0.76 - 11 0 0 13 1 16 17 15 46.7 51 194 15 12 57 41 13 4 51 12 56 36 13 5 56 -0.76 - 10 0 0 13 8 9 17 15 50.1 51 195 14 13 4 34 13 11 45 13 3 29 13 12 50 -0.76 - 9 0 0 13 15 36 17 15 53.5 50 196 13 13 12 1 13 19 12 13 10 56 13 20 17 -0.76 - 8 0 0 13 23 36 17 15 56.8 50 198 12 13 20 0 13 27 13 13 18 56 13 28 17 -0.76 - 7 0 0 13 32 10 17 16 0.1 49 199 11 13 28 34 13 35 46 13 27 29 13 36 51 -0.76 - 6 0 0 13 41 16 17 16 3.4 49 200 10 13 37 40 13 44 53 13 36 35 13 45 58 -0.76 - 5 0 0 13 50 56 17 16 6.7 48 202 9 13 47 19 13 54 33 13 46 14 13 55 38 -0.76 - 4 0 0 14 1 8 17 16 10.0 48 203 8 13 57 31 14 4 45 13 56 26 14 5 51 -0.76 - 3 0 0 14 11 53 17 16 13.2 47 204 7 14 8 15 14 15 31 14 7 10 14 16 36 -0.76 - 2 0 0 14 23 11 17 16 16.4 47 205 6 14 19 33 14 26 49 14 18 28 14 27 54 -0.76 - 1 0 0 14 35 1 17 16 19.6 46 206 5 14 31 22 14 38 39 14 30 17 14 39 45 -0.76 0 0 0 14 47 23 17 16 22.7 45 207 4 14 43 44 14 51 2 14 42 39 14 52 7 -0.76 1 0 0 15 0 17 17 16 25.8 45 208 3 14 56 38 15 3 57 14 55 33 15 5 2 -0.76 2 0 0 15 13 43 17 16 28.9 44 209 2 15 10 4 15 17 23 15 8 58 15 18 29 -0.76 3 0 0 15 27 41 17 16 31.9 43 210 1 15 24 1 15 31 21 15 22 55 15 32 27 -0.76 4 0 0 15 42 11 17 16 34.9 43 211 0 15 38 30 15 45 51 15 37 24 15 46 57 -0.76 5 0 0 15 57 11 17 16 37.9 42 212 -1 15 53 30 16 0 52 15 52 24 16 1 58 -0.76 6 0 0 16 12 43 17 16 40.8 41 213 -2 16 9 1 16 16 24 16 7 55 16 17 31 -0.76 7 0 0 16 28 45 17 16 43.7 41 214 -3 16 25 3 16 32 27 16 23 57 16 33 33 -0.76 8 0 0 16 45 18 17 16 46.6 40 215 -4 16 41 35 16 49 0 16 40 29 16 50 7 -0.76 9 0 0 17 2 20 17 16 49.4 39 215 -5 16 58 37 17 6 4 16 57 31 17 7 10 -0.76 10 0 0 17 19 53 17 16 52.1 38 216 -6 17 16 10 17 23 37 17 15 3 17 24 44 -0.76 11 0 0 17 37 56 17 16 54.8 37 217 -7 17 34 11 17 41 40 17 33 4 17 42 47 -0.76 12 0 0 17 56 27 17 16 57.5 37 218 -8 17 52 42 18 0 12 17 51 35 18 1 19 -0.76 13 0 0 18 15 28 17 17 0.1 36 218 -9 18 11 42 18 19 13 18 10 35 18 20 21 -0.76 14 0 0 18 34 56 17 17 2.6 35 219 -10 18 31 11 18 38 43 18 30 3 18 39 50 -0.76 15 0 0 18 54 53 17 17 5.2 34 220 -11 18 51 7 18 58 40 18 49 59 18 59 48 -0.76 16 0 0 19 15 18 17 17 7.6 33 220 -12 19 11 31 19 19 5 19 10 23 19 20 13 -0.76 17 0 0 19 36 10 17 17 10.0 32 221 -13 19 32 22 19 39 58 19 31 14 19 41 6 -0.76 18 0 0 19 57 29 17 17 12.3 31 222 -14 19 53 40 20 1 17 19 52 32 20 2 26 -0.76 19 0 0 20 19 14 17 17 14.6 30 222 -15 20 15 25 20 23 3 20 14 17 20 24 12 -0.76 20 0 0 20 41 25 17 17 16.8 29 223 -16 20 37 35 20 45 15 20 36 27 20 46 24 -0.76 21 0 0 21 4 1 17 17 19.0 29 224 -17 21 0 11 21 7 52 20 59 2 21 9 1 -0.76 22 0 0 21 27 2 17 17 21.1 28 224 -18 21 23 12 21 30 53 21 22 2 21 32 3 -0.76 23 0 0 21 50 28 17 17 23.1 27 225 -19 21 46 36 21 54 19 21 45 27 21 55 29 -0.77 24 0 0 22 14 17 17 17 25.1 26 225 -20 22 10 25 22 18 9 22 9 15 22 19 19 -0.77 25 0 0 22 38 29 17 17 27.0 25 226 -21 22 34 36 22 42 22 22 33 26 22 43 32 -0.77 26 0 0 23 3 3 17 17 28.8 24 226 -22 22 59 10 23 6 57 22 58 0 23 8 7 -0.77 27 0 0 23 28 0 17 17 30.6 23 227 -23 23 24 6 23 31 54 23 22 56 23 33 4 -0.77 28 0 0 23 53 18 17 17 32.2 22 228 -24 23 49 23 23 57 13 23 48 13 23 58 23 -0.77 29 0 0 24 18 56 17 17 33.9 21 228 -25 24 15 0 24 22 51 24 13 50 24 24 2 -0.77 30 0 0 24 44 54 17 17 35.4 20 229 -26 24 40 58 24 48 50 24 39 47 24 50 1 -0.77 31 0 0 25 11 11 17 17 36.9 19 229 -27 25 7 14 25 15 8 25 6 3 25 16 19 -0.77 32 0 0 25 37 46 17 17 38.3 18 230 -27 25 33 49 25 41 44 25 32 38 25 42 55 -0.77 33 0 0 26 4 39 17 17 39.6 17 230 -28 26 0 41 26 8 37 25 59 30 26 9 49 -0.77 34 0 0 26 31 49 17 17 40.9 16 231 -29 26 27 50 26 35 48 26 26 39 26 36 59 -0.77 35 0 0 26 59 15 17 17 42.1 15 231 -30 26 55 15 27 3 14 26 54 4 27 4 26 -0.77 36 0 0 27 26 56 17 17 43.2 14 232 -31 27 22 55 27 30 56 27 21 44 27 32 8 -0.77 37 0 0 27 54 51 17 17 44.2 13 232 -32 27 50 50 27 58 52 27 49 38 28 0 4 -0.77 38 0 0 28 23 0 17 17 45.2 12 233 -33 28 18 58 28 27 1 28 17 46 28 28 14 -0.77 39 0 0 28 51 21 17 17 46.0 11 233 -33 28 47 19 28 55 24 28 46 7 28 56 36 -0.77 40 0 0 29 19 55 17 17 46.8 10 234 -34 29 15 52 29 23 57 29 14 40 29 25 10 -0.77 41 0 0 29 48 39 17 17 47.6 9 234 -35 29 44 36 29 52 42 29 43 23 29 53 55 -0.77 42 0 0 30 17 33 17 17 48.2 8 235 -36 30 13 29 30 21 37 30 12 16 30 22 50 -0.78 43 0 0 30 46 36 17 17 48.8 7 235 -37 30 42 32 30 50 41 30 41 19 30 51 54 -0.78 44 0 0 31 15 48 17 17 49.3 6 236 -37 31 11 43 31 19 53 31 10 30 31 21 6 -0.78 45 0 0 31 45 6 17 17 49.7 5 236 -38 31 41 1 31 49 12 31 39 48 31 50 26 -0.79 46 0 0 32 14 31 17 17 50.1 4 237 -39 32 10 25 32 18 37 32 9 12 32 19 51 -0.79 47 0 0 32 44 1 17 17 50.4 3 237 -40 32 39 55 32 48 8 32 38 41 32 49 22 -0.81 48 0 0 33 13 36 17 17 50.6 2 238 -40 33 9 29 33 17 43 33 8 15 33 18 57 -0.82 49 0 0 33 43 13 17 17 50.7 1 238 -41 33 39 6 33 47 21 33 37 52 33 48 35 -0.87 50 0 0 34 12 54 17 17 50.8 0 239 -42 34 8 46 34 17 2 34 7 32 34 18 16 -1.14 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 325-122167 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 54 42.2100 DE: -25 01 10.971 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 54 42.2099 DE: -25 01 10.971 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.3 * B mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4245) Nairc asteroid class: approx. diameter [km]: 10 approx. diameter ["]: 0.005 distance from Earth [AU]: 2.66690 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#43 date of fit: 2023 Apr 24 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): 0.010", 0.001", 90.909° remarks: * orbital elements for (4245)Nairc : Mean anomaly = 284.5998476334 deg Arg. of pericenter = 26.1799996448 deg Long. of node = 359.0043702455 deg Inclination = 1.9425490273 deg Eccentricity = 0.1679700748 Semimajor axis = 2.3751197697 AU Perihelion dist = 1.9761707243 AU Mag: H = 14.03, G = 0.15 Epoch of elements : MJD 60604.71889213 TDT (2024 Oct 21.7189) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#432023Apr24,0.33,2024,10,21,17.253415,-0.011305,0.606288,18.043634,0.319564,0.004877,-0.000111,-0.000001,0.000000 -20.3880,-25.0251,-82.67,-11.05,False UCAC4 325-122167,17.91172504,-25.0197141,11.46,11.25,11.14,0.0,0,,17.93693805,-25.0251257,7.81,7.47,0,0,0 4245,Nairc,19.06,10.448,2.6669,0,0,4.378,1.06,,0.8,0 0,284.4063,2024,10,21,26.1800,359.0044,1.9425,0.16797,2.37512,1.97617,14.03,5.0,0.15 1.150,0.0097,0.0007,91,0.0008,Known errors,1.01,0,-1,-1 20241021_122167,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org