IOTA/IOTA-ES occultation update for (2773) Brooks / UCAC4 329-124658 event on 2024 Oct 20, 21:56 UT Visible from Summary ------- On 2024 Oct 20 UT, the 12.6072699950038 km diameter asteroid (2773) Brooks will occult a 11.9 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 6.37 mag to 18.26 mag (the magnitude of the asteroid) for at most 0.430 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 20, 21:53 - 2024 Oct 20, 22:00 * geocentric midpoint of event [JD]: 2460604.41457450 * magnitude of target star: 11.89 * magnitude drop [mag]: 6.37 * estimated maximum duration [s]: 0.430 * Moon: 83 % sunlit, 163° distance * Sun: 65° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.26 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 93°) * approx speed of asteroid's shadow [km/s]: 29.7462 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 329-124658 by 2773 Brooks on 2024 Oct 20 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 -167 0 0 16 51 31 21 53 35.5 0 115 59 16 47 29 16 55 33 16 45 24 16 57 37 .... -166 0 0 16 24 7 21 53 35.6 1 116 60 16 20 5 16 28 9 16 18 1 16 30 13 -0.09 -165 0 0 15 56 44 21 53 35.7 2 116 61 15 52 42 16 0 45 15 50 38 16 2 50 -0.19 -164 0 0 15 29 22 21 53 35.9 4 116 61 15 25 20 15 33 23 15 23 16 15 35 28 -0.23 -163 0 0 15 2 1 21 53 36.2 5 117 62 14 58 0 15 6 3 14 55 56 15 8 7 -0.25 -162 0 0 14 34 44 21 53 36.6 6 117 63 14 30 43 14 38 45 14 28 39 14 40 49 -0.26 -161 0 0 14 7 30 21 53 37.1 7 117 64 14 3 29 14 11 31 14 1 25 14 13 35 -0.27 -160 0 0 13 40 20 21 53 37.6 8 117 64 13 36 19 13 44 21 13 34 15 13 46 25 -0.28 -159 0 0 13 13 15 21 53 38.2 9 118 65 13 9 14 13 17 15 13 7 10 13 19 19 -0.28 -158 0 0 12 46 15 21 53 38.9 10 118 66 12 42 15 12 50 16 12 40 11 12 52 19 -0.29 -157 0 0 12 19 22 21 53 39.7 11 118 66 12 15 22 12 23 22 12 13 18 12 25 26 -0.29 -156 0 0 11 52 36 21 53 40.5 12 118 67 11 48 36 11 56 36 11 46 32 11 58 39 -0.29 -155 0 0 11 25 57 21 53 41.4 13 118 68 11 21 58 11 29 57 11 19 54 11 32 1 -0.30 -154 0 0 10 59 27 21 53 42.5 14 119 68 10 55 28 11 3 27 10 53 25 11 5 30 -0.30 -153 0 0 10 33 7 21 53 43.5 15 119 69 10 29 8 10 37 6 10 27 5 10 39 9 -0.30 -152 0 0 10 6 56 21 53 44.7 16 119 69 10 2 57 10 10 55 10 0 54 10 12 58 -0.30 -151 0 0 9 40 55 21 53 45.9 18 119 70 9 36 57 9 44 54 9 34 54 9 46 57 -0.30 -150 0 0 9 15 6 21 53 47.3 19 120 70 9 11 8 9 19 5 9 9 6 9 21 7 -0.30 -149 0 0 8 49 29 21 53 48.6 20 120 70 8 45 31 8 53 27 8 43 29 8 55 29 -0.30 -148 0 0 8 24 4 21 53 50.1 21 120 70 8 20 7 8 28 2 8 18 5 8 30 4 -0.31 -147 0 0 7 58 53 21 53 51.7 22 120 71 7 54 56 8 2 50 7 52 53 8 4 52 -0.31 -146 0 0 7 33 55 21 53 53.3 23 120 71 7 29 58 7 37 52 7 27 56 7 39 54 -0.31 -145 0 0 7 9 11 21 53 55.0 24 120 71 7 5 15 7 13 8 7 3 13 7 15 10 -0.31 -144 0 0 6 44 43 21 53 56.7 25 121 71 6 40 47 6 48 39 6 38 45 6 50 41 -0.31 -143 0 0 6 20 30 21 53 58.5 26 121 71 6 16 34 6 24 26 6 14 33 6 26 27 -0.31 -142 0 0 5 56 33 21 54 0.4 27 121 70 5 52 38 6 0 29 5 50 37 6 2 30 -0.31 -141 0 0 5 32 53 21 54 2.4 28 121 70 5 28 59 5 36 48 5 26 58 5 38 49 -0.31 -140 0 0 5 9 31 21 54 4.4 29 121 70 5 5 36 5 13 25 5 3 36 5 15 26 -0.31 -139 0 0 4 46 26 21 54 6.5 30 122 70 4 42 32 4 50 20 4 40 31 4 52 20 -0.31 -138 0 0 4 23 39 21 54 8.7 31 122 69 4 19 45 4 27 33 4 17 45 4 29 33 -0.31 -137 0 0 4 1 11 21 54 10.9 32 122 69 3 57 18 4 5 4 3 55 18 4 7 5 -0.31 -136 0 0 3 39 2 21 54 13.2 33 122 68 3 35 9 3 42 55 3 33 10 3 44 55 -0.31 -135 0 0 3 17 13 21 54 15.6 35 123 68 3 13 21 3 21 6 3 11 21 3 23 5 -0.31 -134 0 0 2 55 44 21 54 18.0 36 123 67 2 51 52 2 59 36 2 49 53 3 1 36 -0.31 -133 0 0 2 34 36 21 54 20.5 37 123 67 2 30 44 2 38 28 2 28 45 2 40 27 -0.31 -132 0 0 2 13 49 21 54 23.0 38 123 66 2 9 57 2 17 40 2 7 58 2 19 39 -0.32 -131 0 0 1 53 23 21 54 25.6 39 123 65 1 49 32 1 57 14 1 47 33 1 59 12 -0.32 -130 0 0 1 33 18 21 54 28.3 40 124 64 1 29 28 1 37 9 1 27 30 1 39 8 -0.32 -129 0 0 1 13 36 21 54 31.0 41 124 64 1 9 46 1 17 26 1 7 48 1 19 25 -0.32 -128 0 0 0 54 17 21 54 33.7 42 124 63 0 50 27 0 58 6 0 48 29 1 0 5 -0.32 -127 0 0 0 35 20 21 54 36.5 43 125 62 0 31 31 0 39 9 0 29 33 0 41 7 -0.32 -126 0 0 0 16 47 21 54 39.4 44 125 61 0 12 58 0 20 35 0 11 0 0 22 33 -0.32 -125 0 0 - 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3 7 21 21 55 20.3 56 131 50 - 3 11 5 - 3 3 38 - 3 13 1 - 3 1 42 -0.32 -112 0 0 - 3 20 5 21 55 23.7 57 132 49 - 3 23 48 - 3 16 21 - 3 25 43 - 3 14 26 -0.32 -111 0 0 - 3 32 21 21 55 27.1 58 133 48 - 3 36 4 - 3 28 38 - 3 37 59 - 3 26 43 -0.32 -110 0 0 - 3 44 11 21 55 30.6 59 133 47 - 3 47 54 - 3 40 28 - 3 49 49 - 3 38 33 -0.32 -109 0 0 - 3 55 34 21 55 34.1 60 134 46 - 3 59 17 - 3 51 52 - 4 1 12 - 3 49 57 -0.32 -108 0 0 - 4 6 31 21 55 37.6 61 135 45 - 4 10 13 - 4 2 48 - 4 12 8 - 4 0 54 -0.32 -107 0 0 - 4 17 0 21 55 41.1 61 136 44 - 4 20 42 - 4 13 18 - 4 22 37 - 4 11 24 -0.32 -106 0 0 - 4 27 3 21 55 44.7 62 137 43 - 4 30 45 - 4 23 21 - 4 32 39 - 4 21 27 -0.32 -105 0 0 - 4 36 38 21 55 48.3 63 139 42 - 4 40 20 - 4 32 56 - 4 42 14 - 4 31 2 -0.32 -104 0 0 - 4 45 46 21 55 51.9 64 140 41 - 4 49 28 - 4 42 5 - 4 51 21 - 4 40 11 -0.32 -103 0 0 - 4 54 27 21 55 55.5 65 141 40 - 4 58 8 - 4 50 46 - 5 0 2 - 4 48 52 -0.32 -102 0 0 - 5 2 40 21 55 59.1 65 143 39 - 5 6 21 - 4 58 59 - 5 8 15 - 4 57 6 -0.32 -101 0 0 - 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4 44 52 - 4 37 29 - 4 46 46 - 4 35 35 -0.33 - 64 0 0 - 4 31 49 21 58 20.1 61 225 1 - 4 35 31 - 4 28 7 - 4 37 25 - 4 26 13 -0.33 - 63 0 0 - 4 22 0 21 58 23.6 60 226 0 - 4 25 42 - 4 18 18 - 4 27 36 - 4 16 23 -0.33 - 62 0 0 - 4 11 44 21 58 27.1 59 227 -1 - 4 15 26 - 4 8 1 - 4 17 20 - 4 6 7 -0.33 - 61 0 0 - 4 1 1 21 58 30.6 58 228 -2 - 4 4 43 - 3 57 18 - 4 6 38 - 3 55 24 -0.33 - 60 0 0 - 3 49 51 21 58 34.0 57 229 -3 - 3 53 34 - 3 46 8 - 3 55 28 - 3 44 13 -0.33 - 59 0 0 - 3 38 14 21 58 37.4 56 230 -4 - 3 41 57 - 3 34 31 - 3 43 52 - 3 32 36 -0.33 - 58 0 0 - 3 26 11 21 58 40.8 56 230 -5 - 3 29 54 - 3 22 27 - 3 31 49 - 3 20 32 -0.33 - 57 0 0 - 3 13 41 21 58 44.1 55 231 -6 - 3 17 25 - 3 9 57 - 3 19 20 - 3 8 2 -0.33 - 56 0 0 - 3 0 45 21 58 47.4 54 231 -7 - 3 4 29 - 2 57 1 - 3 6 24 - 2 55 5 -0.33 - 55 0 0 - 2 47 23 21 58 50.7 53 232 -8 - 2 51 7 - 2 43 38 - 2 53 2 - 2 41 43 -0.33 - 54 0 0 - 2 33 34 21 58 53.9 52 233 -9 - 2 37 19 - 2 29 49 - 2 39 15 - 2 27 54 -0.32 - 53 0 0 - 2 19 20 21 58 57.1 51 233 -10 - 2 23 5 - 2 15 35 - 2 25 1 - 2 13 39 -0.32 - 52 0 0 - 2 4 40 21 59 0.3 50 234 -11 - 2 8 25 - 2 0 54 - 2 10 21 - 1 58 58 -0.32 - 51 0 0 - 1 49 34 21 59 3.4 49 234 -12 - 1 53 20 - 1 45 48 - 1 55 16 - 1 43 52 -0.32 - 50 0 0 - 1 34 4 21 59 6.5 48 234 -13 - 1 37 50 - 1 30 17 - 1 39 46 - 1 28 21 -0.32 - 49 0 0 - 1 18 8 21 59 9.5 47 235 -14 - 1 21 54 - 1 14 21 - 1 23 51 - 1 12 24 -0.32 - 48 0 0 - 1 1 47 21 59 12.5 46 235 -15 - 1 5 34 - 0 58 0 - 1 7 31 - 0 56 3 -0.32 - 47 0 0 - 0 45 1 21 59 15.4 45 235 -16 - 0 48 49 - 0 41 14 - 0 50 46 - 0 39 17 -0.32 - 46 0 0 - 0 27 52 21 59 18.3 44 236 -17 - 0 31 39 - 0 24 4 - 0 33 36 - 0 22 6 -0.32 - 45 0 0 - 0 10 18 21 59 21.2 43 236 -18 - 0 14 6 - 0 6 29 - 0 16 3 - 0 4 32 -0.32 - 44 0 0 0 7 40 21 59 24.0 42 236 -19 0 3 52 0 11 29 0 1 54 0 13 27 -0.32 - 43 0 0 0 26 2 21 59 26.8 41 237 -20 0 22 13 0 29 51 0 20 15 0 31 49 -0.32 - 42 0 0 0 44 46 21 59 29.5 40 237 -21 0 40 57 0 48 36 0 38 59 0 50 34 -0.32 - 41 0 0 1 3 54 21 59 32.1 39 237 -23 1 0 4 1 7 44 0 58 6 1 9 42 -0.32 - 40 0 0 1 23 24 21 59 34.7 38 237 -24 1 19 34 1 27 14 1 17 35 1 29 13 -0.32 - 39 0 0 1 43 17 21 59 37.3 37 238 -25 1 39 26 1 47 7 1 37 27 1 49 6 -0.32 - 38 0 0 2 3 31 21 59 39.7 36 238 -26 1 59 40 2 7 22 1 57 41 2 9 21 -0.32 - 37 0 0 2 24 7 21 59 42.2 35 238 -27 2 20 16 2 27 58 2 18 16 2 29 58 -0.32 - 36 0 0 2 45 4 21 59 44.5 34 238 -28 2 41 12 2 48 56 2 39 13 2 50 55 -0.32 - 35 0 0 3 6 22 21 59 46.9 33 238 -29 3 2 30 3 10 14 3 0 30 3 12 14 -0.32 - 34 0 0 3 28 0 21 59 49.1 32 239 -30 3 24 7 3 31 53 3 22 8 3 33 53 -0.32 - 33 0 0 3 49 58 21 59 51.3 31 239 -31 3 46 5 3 53 51 3 44 5 3 55 51 -0.32 - 32 0 0 4 12 16 21 59 53.4 30 239 -32 4 8 22 4 16 9 4 6 22 4 18 10 -0.32 - 31 0 0 4 34 52 21 59 55.5 29 239 -33 4 30 58 4 38 46 4 28 58 4 40 47 -0.32 - 30 0 0 4 57 47 21 59 57.4 28 239 -34 4 53 53 5 1 42 4 51 52 5 3 42 -0.32 - 29 0 0 5 21 0 21 59 59.4 26 240 -35 5 17 6 5 24 55 5 15 5 5 26 56 -0.32 - 28 0 0 5 44 31 22 0 1.2 25 240 -36 5 40 36 5 48 26 5 38 35 5 50 27 -0.32 - 27 0 0 6 8 18 22 0 3.0 24 240 -37 6 4 23 6 12 14 6 2 21 6 14 15 -0.32 - 26 0 0 6 32 22 22 0 4.7 23 240 -38 6 28 26 6 36 18 6 26 25 6 38 19 -0.32 - 25 0 0 6 56 41 22 0 6.4 22 240 -39 6 52 45 7 0 38 6 50 44 7 2 39 -0.32 - 24 0 0 7 21 16 22 0 7.9 21 240 -40 7 17 20 7 25 13 7 15 18 7 27 15 -0.32 - 23 0 0 7 46 6 22 0 9.4 20 241 -41 7 42 9 7 50 3 7 40 7 7 52 5 -0.32 - 22 0 0 8 11 9 22 0 10.8 19 241 -43 8 7 12 8 15 7 8 5 10 8 17 9 -0.32 - 21 0 0 8 36 27 22 0 12.2 18 241 -44 8 32 29 8 40 24 8 30 27 8 42 27 -0.32 - 20 0 0 9 1 56 22 0 13.4 17 241 -45 8 57 58 9 5 55 8 55 56 9 7 57 -0.32 - 19 0 0 9 27 39 22 0 14.6 16 241 -46 9 23 40 9 31 37 9 21 38 9 33 40 -0.32 - 18 0 0 9 53 32 22 0 15.8 15 242 -47 9 49 34 9 57 31 9 47 31 9 59 34 -0.32 - 17 0 0 10 19 37 22 0 16.8 14 242 -48 10 15 38 10 23 36 10 13 35 10 25 39 -0.32 - 16 0 0 10 45 51 22 0 17.7 13 242 -49 10 41 52 10 49 51 10 39 49 10 51 54 -0.32 - 15 0 0 11 12 15 22 0 18.6 11 242 -50 11 8 16 11 16 15 11 6 13 11 18 18 -0.32 - 14 0 0 11 38 48 22 0 19.4 10 242 -51 11 34 49 11 42 48 11 32 45 11 44 52 -0.32 - 13 0 0 12 5 30 22 0 20.2 9 243 -52 12 1 30 12 9 30 11 59 26 12 11 33 -0.32 - 12 0 0 12 32 18 22 0 20.8 8 243 -53 12 28 18 12 36 18 12 26 14 12 38 22 -0.32 - 11 0 0 12 59 13 22 0 21.4 7 243 -54 12 55 13 13 3 14 12 53 9 13 5 18 -0.32 - 10 0 0 13 26 14 22 0 21.9 6 243 -55 13 22 14 13 30 15 13 20 10 13 32 19 -0.32 - 9 0 0 13 53 21 22 0 22.3 5 244 -56 13 49 20 13 57 22 13 47 16 13 59 26 -0.32 - 8 0 0 14 20 32 22 0 22.6 4 244 -57 14 16 31 14 24 33 14 14 27 14 26 37 -0.32 - 7 0 0 14 47 47 22 0 22.8 3 244 -58 14 43 45 14 51 48 14 41 41 14 53 52 -0.32 - 6 0 0 15 15 4 22 0 23.0 2 244 -58 15 11 3 15 19 6 15 8 59 15 21 10 -0.33 - 5 0 0 15 42 24 22 0 23.1 1 245 -59 15 38 23 15 46 26 15 36 18 15 48 30 -0.34 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 329-124658 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 10 37.7895 DE: -24 12 23.538 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 10 37.7894 DE: -24 12 23.538 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.9 * B mag [mag]: 12.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2773) Brooks asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.60220 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 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): 0.012", 0.002", 92.943° remarks: * orbital elements for (2773)Brooks : Mean anomaly = 273.1686921463 deg Arg. of pericenter = 296.7963483749 deg Long. of node = 101.1540272461 deg Inclination = 3.6689764535 deg Eccentricity = 0.1420670946 Semimajor axis = 2.3281694336 AU Perihelion dist = 1.9974131666 AU Mag: H = 13.25, G = 0.15 Epoch of elements : MJD 60603.91457437 TDT (2024 Oct 20.9146) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr24,0.43,2024,10,20,21.949788,0.002590,0.309866,16.788819,-0.159030,0.005074,0.000071,-0.000001,0.000000 -86.0612,-24.2024,-153.09,-10.76,False UCAC4 329-124658,18.17716380,-24.2065384,12.71,11.89,11.45,0.1,0,,18.20224493,-24.2023931,6.38,6.37,0,0,0 2773,Brooks,18.26,12.796,2.6022,0,0,4.148,-0.53,,0.8,0 0,272.9149,2024,10,20,296.7963,101.1540,3.6690,0.14207,2.32817,1.99741,13.25,5.0,0.15 1.257,0.0120,0.0017,93,0.0017,Known errors,1.09,0,-1,-1 20241020_124658,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org