IOTA/IOTA-ES occultation update for (1721) Wells / UCAC4 309-238467 event on 2024 Oct 29, 22:34 UT Visible from Summary ------- On 2024 Oct 29 UT, the 44.908 km diameter asteroid (1721) Wells will occult a 10.7 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 6.44 mag to 17.18 mag (the magnitude of the asteroid) for at most 1.530 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: 100 * date and approx. time of event: 2024 Oct 29, 22:30 - 2024 Oct 29, 22:38 * geocentric midpoint of event [JD]: 2460613.44062421 * magnitude of target star: 10.74 * magnitude drop [mag]: 6.44 * estimated maximum duration [s]: 1.530 * Moon: 6 % sunlit, 92° distance * Sun: 64° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.001", 73°) * approx speed of asteroid's shadow [km/s]: 29.2718 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 309-238467 by 1721 Wells on 2024 Oct 29 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 163 0 0 -22 57 2 22 30 54.7 0 121 55 -23 11 24 -22 42 40 -23 12 59 -22 41 6 .... 164 0 0 -23 30 6 22 30 54.7 1 120 56 -23 44 27 -23 15 46 -23 46 1 -23 14 12 0.22 165 0 0 -24 2 45 22 30 54.9 2 120 57 -24 17 3 -23 48 27 -24 18 37 -23 46 53 0.19 166 0 0 -24 34 57 22 30 55.1 4 120 58 -24 49 13 -24 20 41 -24 50 46 -24 19 8 0.18 167 0 0 -25 6 42 22 30 55.4 5 119 59 -25 20 56 -24 52 28 -25 22 29 -24 50 55 0.18 168 0 0 -25 37 59 22 30 55.7 6 119 59 -25 52 11 -25 23 48 -25 53 44 -25 22 15 0.18 169 0 0 -26 8 48 22 30 56.2 7 118 60 -26 22 58 -25 54 40 -26 24 31 -25 53 7 0.17 170 0 0 -26 39 9 22 30 56.7 8 118 61 -26 53 16 -26 25 3 -26 54 49 -26 23 30 0.17 171 0 0 -27 9 1 22 30 57.2 9 117 61 -27 23 6 -26 54 57 -27 24 38 -26 53 25 0.17 172 0 0 -27 38 24 22 30 57.9 10 117 62 -27 52 26 -27 24 22 -27 53 58 -27 22 50 0.17 173 0 0 -28 7 17 22 30 58.6 11 117 63 -28 21 16 -27 53 17 -28 22 48 -27 51 46 0.17 174 0 0 -28 35 39 22 30 59.3 12 116 63 -28 49 37 -28 21 43 -28 51 8 -28 20 12 0.17 175 0 0 -29 3 32 22 31 0.1 13 116 64 -29 17 27 -28 49 38 -29 18 58 -28 48 7 0.17 176 0 0 -29 30 54 22 31 1.0 14 115 64 -29 44 46 -29 17 3 -29 46 17 -29 15 32 0.17 177 0 0 -29 57 46 22 31 1.9 15 115 65 -30 11 35 -29 43 57 -30 13 6 -29 42 26 0.17 178 0 0 -30 24 6 22 31 2.9 16 114 65 -30 37 53 -30 10 20 -30 39 23 -30 8 50 0.16 179 0 0 -30 49 56 22 31 3.9 17 114 66 -31 3 40 -30 36 12 -31 5 10 -30 34 42 0.16 -180 0 0 -31 15 14 22 31 5.0 18 113 66 -31 28 56 -31 1 33 -31 30 25 -31 0 3 0.16 -179 0 0 -31 40 1 22 31 6.2 19 112 66 -31 53 40 -31 26 23 -31 55 10 -31 24 53 0.16 -178 0 0 -32 4 17 22 31 7.4 19 112 67 -32 17 53 -31 50 41 -32 19 23 -31 49 12 0.16 -177 0 0 -32 28 1 22 31 8.6 20 111 67 -32 41 35 -32 14 28 -32 43 4 -32 13 0 0.16 -176 0 0 -32 51 14 22 31 9.9 21 111 67 -33 4 45 -32 37 44 -33 6 14 -32 36 16 0.16 -175 0 0 -33 13 56 22 31 11.2 22 110 67 -33 27 24 -33 0 28 -33 28 53 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12 -36 51 24 0.16 -162 0 0 -37 21 48 22 31 31.9 34 102 67 -37 34 44 -37 8 51 -37 36 9 -37 7 27 0.16 -161 0 0 -37 37 18 22 31 33.7 34 101 66 -37 50 12 -37 24 24 -37 51 37 -37 22 59 0.16 -160 0 0 -37 52 18 22 31 35.5 35 101 66 -38 5 11 -37 39 26 -38 6 35 -37 38 2 0.16 -159 0 0 -38 6 49 22 31 37.4 36 100 66 -38 19 39 -37 53 59 -38 21 3 -37 52 35 0.16 -158 0 0 -38 20 50 22 31 39.3 37 99 65 -38 33 38 -38 8 2 -38 35 2 -38 6 38 0.16 -157 0 0 -38 34 22 22 31 41.2 38 99 65 -38 47 8 -38 21 36 -38 48 32 -38 20 12 0.16 -156 0 0 -38 47 24 22 31 43.2 39 98 65 -39 0 9 -38 34 40 -39 1 32 -38 33 17 0.16 -155 0 0 -38 59 58 22 31 45.2 39 97 64 -39 12 40 -38 47 15 -39 14 4 -38 45 52 0.16 -154 0 0 -39 12 2 22 31 47.1 40 97 64 -39 24 43 -38 59 22 -39 26 6 -38 57 59 0.16 -153 0 0 -39 23 38 22 31 49.2 41 96 63 -39 36 17 -39 10 59 -39 37 40 -39 9 37 0.16 -152 0 0 -39 34 46 22 31 51.2 42 95 63 -39 47 23 -39 22 9 -39 48 46 -39 20 46 0.16 -151 0 0 -39 45 25 22 31 53.3 43 94 62 -39 58 1 -39 32 49 -39 59 23 -39 31 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43 35 -12 10 46 0.17 - 41 0 0 -11 48 6 22 37 22.3 36 243 -27 -12 2 54 -11 33 19 -12 4 31 -11 31 42 0.17 - 40 0 0 -11 8 55 22 37 25.0 35 243 -29 -11 23 44 -10 54 8 -11 25 21 -10 52 31 0.17 - 39 0 0 -10 29 39 22 37 27.6 34 243 -30 -10 44 27 -10 14 51 -10 46 4 -10 13 14 0.17 - 38 0 0 - 9 50 18 22 37 30.1 33 242 -31 -10 5 6 - 9 35 31 -10 6 43 - 9 33 54 0.17 - 37 0 0 - 9 10 54 22 37 32.5 32 242 -32 - 9 25 42 - 8 56 7 - 9 27 19 - 8 54 30 0.17 - 36 0 0 - 8 31 29 22 37 34.9 30 242 -33 - 8 46 17 - 8 16 42 - 8 47 54 - 8 15 5 0.17 - 35 0 0 - 7 52 3 22 37 37.2 29 242 -34 - 8 6 51 - 7 37 17 - 8 8 28 - 7 35 40 0.17 - 34 0 0 - 7 12 39 22 37 39.4 28 242 -36 - 7 27 26 - 6 57 54 - 7 29 3 - 6 56 17 0.17 - 33 0 0 - 6 33 18 22 37 41.5 27 241 -37 - 6 48 4 - 6 18 33 - 6 49 40 - 6 16 56 0.17 - 32 0 0 - 5 54 0 22 37 43.5 26 241 -38 - 6 8 45 - 5 39 16 - 6 10 22 - 5 37 39 0.17 - 31 0 0 - 5 14 48 22 37 45.5 24 241 -39 - 5 29 32 - 5 0 5 - 5 31 9 - 4 58 28 0.17 - 30 0 0 - 4 35 42 22 37 47.4 23 241 -40 - 4 50 25 - 4 21 0 - 4 52 2 - 4 19 24 0.17 - 29 0 0 - 3 56 45 22 37 49.1 22 241 -42 - 4 11 27 - 3 42 4 - 4 13 3 - 3 40 28 0.17 - 28 0 0 - 3 17 57 22 37 50.8 21 241 -43 - 3 32 37 - 3 3 17 - 3 34 14 - 3 1 41 0.17 - 27 0 0 - 2 39 19 22 37 52.4 20 241 -44 - 2 53 59 - 2 24 41 - 2 55 35 - 2 23 5 0.18 - 26 0 0 - 2 0 54 22 37 53.9 18 241 -45 - 2 15 31 - 1 46 17 - 2 17 7 - 1 44 41 0.18 - 25 0 0 - 1 22 41 22 37 55.3 17 241 -46 - 1 37 17 - 1 8 6 - 1 38 53 - 1 6 31 0.18 - 24 0 0 - 0 44 43 22 37 56.6 16 241 -47 - 0 59 18 - 0 30 10 - 1 0 53 - 0 28 34 0.18 - 23 0 0 - 0 7 1 22 37 57.8 15 241 -49 - 0 21 33 0 7 31 - 0 23 9 0 9 6 0.18 - 22 0 0 0 30 25 22 37 58.9 14 241 -50 0 15 54 0 44 55 0 14 19 0 46 30 0.18 - 21 0 0 1 7 33 22 38 0.0 13 241 -51 0 53 4 1 22 1 0 51 29 1 23 36 0.18 - 20 0 0 1 44 22 22 38 0.9 11 241 -52 1 29 55 1 58 48 1 28 21 2 0 23 0.19 - 19 0 0 2 20 52 22 38 1.8 10 241 -53 2 6 27 2 35 15 2 4 52 2 36 50 0.19 - 18 0 0 2 57 0 22 38 2.5 9 241 -54 2 42 38 3 11 22 2 41 3 3 12 56 0.19 - 17 0 0 3 32 47 22 38 3.2 8 241 -55 3 18 26 3 47 6 3 16 52 3 48 40 0.19 - 16 0 0 4 8 11 22 38 3.7 7 241 -57 3 53 53 4 22 28 3 52 19 4 24 2 0.20 - 15 0 0 4 43 11 22 38 4.2 6 241 -58 4 28 55 4 57 26 4 27 22 4 58 59 0.21 - 14 0 0 5 17 47 22 38 4.6 4 241 -59 5 3 34 5 32 0 5 2 0 5 33 33 0.22 - 13 0 0 5 51 58 22 38 4.9 3 241 -60 5 37 47 6 6 8 5 36 14 6 7 41 0.24 - 12 0 0 6 25 43 22 38 5.1 2 241 -61 6 11 34 6 39 50 6 10 2 6 41 23 0.28 - 11 0 0 6 59 1 22 38 5.2 1 241 -62 6 44 55 7 13 6 6 43 22 7 14 38 0.41 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 309-238467 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 47 11.8426 DE: -28 22 54.251 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 47 11.8424 DE: -28 22 54.251 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 10.7 * B mag [mag]: 11.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1721) Wells asteroid class: approx. diameter [km]: 45 approx. diameter ["]: 0.017 distance from Earth [AU]: 3.60900 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.015", 0.001", 72.766° remarks: * orbital elements for (1721)Wells : Mean anomaly = 202.2497068459 deg Arg. of pericenter = 138.1499305354 deg Long. of node = 317.0639492960 deg Inclination = 16.1210743841 deg Eccentricity = 0.0501638374 Semimajor axis = 3.1474682532 AU Perihelion dist = 2.9895791674 AU Mag: H = 10.95, G = 0.15 Epoch of elements : MJD 60612.94062412 TDT (2024 Oct 29.9406) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,1.53,2024,10,29,22.574981,0.045105,-0.145328,15.783623,4.883506,0.005361,0.000207,-0.000001,0.000000 -95.1823,-28.3563,-162.71,-13.85,False UCAC4 309-238467,18.78662298,-28.3817364,11.12,10.74,10.53,0.0,0,,18.81246279,-28.3563089,6.45,6.20,0,0,0 1721,Wells,17.18,44.908,3.6090,0,0,2.913,11.90,,2.2,0 0,202.0837,2024,10,29,138.1499,317.0639,16.1211,0.05016,3.14747,2.98958,10.95,5.0,0.15 1.055,0.0147,0.0009,73,0.0009,Known errors,1.67,0,-1,-1 20241029_238467,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org