IOTA/IOTA-ES occultation update for (2330) Ontake / UCAC4 351-162908 event on 2024 Oct 13, 21:05 UT Visible from Summary ------- On 2024 Oct 13 UT, the 33.408 km diameter asteroid (2330) Ontake 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 5.66 mag to 17.53 mag (the magnitude of the asteroid) for at most 1.590 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 13, 21:01 - 2024 Oct 13, 21:10 * geocentric midpoint of event [JD]: 2460597.37889458 * magnitude of target star: 11.88 * magnitude drop [mag]: 5.66 * estimated maximum duration [s]: 1.590 * Moon: 82 % sunlit, 48° distance * Sun: 82° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.003", 92°) * approx speed of asteroid's shadow [km/s]: 21.0598 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 351-162908 by 2330 Ontake on 2024 Oct 13 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 -153 0 0 -25 5 58 21 1 16.4 1 112 68 -25 17 24 -24 54 33 -25 22 36 -24 49 22 .... -152 0 0 -25 28 21 21 1 16.6 2 111 69 -25 39 48 -25 16 55 -25 45 0 -25 11 44 0.52 -151 0 0 -25 50 50 21 1 16.8 3 111 69 -26 2 19 -25 39 24 -26 7 31 -25 34 13 0.55 -150 0 0 -26 13 26 21 1 17.1 4 110 69 -26 24 55 -26 1 59 -26 30 8 -25 56 47 0.57 -149 0 0 -26 36 7 21 1 17.5 5 110 69 -26 47 37 -26 24 39 -26 52 50 -26 19 27 0.57 -148 0 0 -26 58 53 21 1 18.1 6 110 69 -27 10 24 -26 47 24 -27 15 37 -26 42 13 0.58 -147 0 0 -27 21 44 21 1 18.7 6 109 69 -27 33 15 -27 10 14 -27 38 29 -27 5 2 0.58 -146 0 0 -27 44 38 21 1 19.4 7 109 69 -27 56 9 -27 33 7 -28 1 23 -27 27 55 0.59 -145 0 0 -28 7 35 21 1 20.3 8 108 69 -28 19 7 -27 56 4 -28 24 21 -27 50 51 0.59 -144 0 0 -28 30 34 21 1 21.2 9 108 69 -28 42 7 -28 19 3 -28 47 21 -28 13 50 0.59 -143 0 0 -28 53 35 21 1 22.2 10 107 69 -29 5 9 -28 42 4 -29 10 24 -28 36 50 0.59 -142 0 0 -29 16 38 21 1 23.3 11 107 69 -29 28 12 -29 5 6 -29 33 27 -28 59 52 0.59 -141 0 0 -29 39 41 21 1 24.5 12 106 68 -29 51 15 -29 28 9 -29 56 31 -29 22 55 0.59 -140 0 0 -30 2 44 21 1 25.8 13 106 68 -30 14 19 -29 51 11 -30 19 34 -29 45 58 0.59 -139 0 0 -30 25 47 21 1 27.2 14 105 68 -30 37 22 -30 14 14 -30 42 37 -30 9 0 0.60 -138 0 0 -30 48 48 21 1 28.7 15 105 67 -31 0 23 -30 37 15 -31 5 39 -30 32 1 0.60 -137 0 0 -31 11 48 21 1 30.2 16 104 67 -31 23 23 -31 0 14 -31 28 39 -30 55 0 0.60 -136 0 0 -31 34 45 21 1 31.9 17 103 67 -31 46 21 -31 23 11 -31 51 37 -31 17 57 0.60 -135 0 0 -31 57 39 21 1 33.6 18 103 66 -32 9 15 -31 46 5 -32 14 31 -31 40 51 0.60 -134 0 0 -32 20 30 21 1 35.4 19 102 65 -32 32 6 -32 8 56 -32 37 22 -32 3 42 0.60 -133 0 0 -32 43 17 21 1 37.3 20 102 65 -32 54 53 -32 31 42 -33 0 9 -32 26 28 0.60 -132 0 0 -33 5 59 21 1 39.3 21 101 64 -33 17 35 -32 54 24 -33 22 51 -32 49 10 0.60 -131 0 0 -33 28 35 21 1 41.3 21 100 64 -33 40 11 -33 17 1 -33 45 27 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26 -39 5 6 0.63 30 0 0 -39 1 54 21 9 44.0 15 256 -42 -39 13 23 -38 50 26 -39 18 37 -38 45 14 0.63 31 0 0 -38 41 51 21 9 45.4 14 256 -43 -38 53 21 -38 30 22 -38 58 35 -38 25 10 0.63 32 0 0 -38 21 36 21 9 46.6 14 255 -43 -38 33 7 -38 10 7 -38 38 20 -38 4 54 0.63 33 0 0 -38 1 9 21 9 47.8 13 254 -44 -38 12 40 -37 49 39 -38 17 54 -37 44 26 0.64 34 0 0 -37 40 30 21 9 49.0 12 254 -44 -37 52 2 -37 29 0 -37 57 16 -37 23 47 0.64 35 0 0 -37 19 41 21 9 50.0 11 253 -44 -37 31 13 -37 8 10 -37 36 27 -37 2 57 0.64 36 0 0 -36 58 40 21 9 51.0 10 253 -45 -37 10 13 -36 47 9 -37 15 28 -36 41 56 0.64 37 0 0 -36 37 30 21 9 52.0 9 252 -45 -36 49 3 -36 25 58 -36 54 18 -36 20 45 0.65 38 0 0 -36 16 9 21 9 52.8 8 251 -46 -36 27 43 -36 4 37 -36 32 58 -35 59 24 0.65 39 0 0 -35 54 39 21 9 53.5 7 251 -46 -36 6 13 -35 43 7 -36 11 29 -35 37 53 0.66 40 0 0 -35 33 1 21 9 54.2 7 250 -46 -35 44 35 -35 21 28 -35 49 50 -35 16 14 0.67 41 0 0 -35 11 13 21 9 54.8 6 250 -47 -35 22 48 -34 59 40 -35 28 3 -34 54 26 0.68 42 0 0 -34 49 18 21 9 55.3 5 249 -47 -35 0 53 -34 37 45 -35 6 8 -34 32 31 0.69 43 0 0 -34 27 15 21 9 55.8 4 248 -47 -34 38 50 -34 15 42 -34 44 6 -34 10 28 0.72 44 0 0 -34 5 5 21 9 56.1 3 248 -48 -34 16 40 -33 53 32 -34 21 56 -33 48 18 0.75 45 0 0 -33 42 49 21 9 56.4 2 247 -48 -33 54 24 -33 31 16 -33 59 40 -33 26 1 0.82 46 0 0 -33 20 27 21 9 56.5 1 247 -48 -33 32 2 -33 8 53 -33 37 18 -33 3 39 0.98 47 0 0 -32 57 59 21 9 56.6 0 246 -48 -33 9 35 -32 46 26 -33 14 50 -32 41 12 2.41 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 351-162908 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 55 16.8285 DE: -19 59 50.535 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 55 16.8284 DE: -19 59 50.535 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2330) Ontake asteroid class: approx. diameter [km]: 33 approx. diameter ["]: 0.015 distance from Earth [AU]: 3.05830 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 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): 0.019", 0.003", 91.875° remarks: * orbital elements for (2330)Ontake : Mean anomaly = 28.6698706580 deg Arg. of pericenter = 130.5029131898 deg Long. of node = 140.3762885331 deg Inclination = 8.6567251521 deg Eccentricity = 0.0339444113 Semimajor axis = 3.1813397523 AU Perihelion dist = 3.0733510472 AU Mag: H = 11.70, G = 0.15 Epoch of elements : MJD 60596.87889442 TDT (2024 Oct 13.8789) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,1.59,2024,10,13,21.093470,-0.038853,-0.509259,11.852841,-0.897372,0.005740,0.000605,0.000000,0.000000 -55.1306,-19.9664,-139.89,-8.20,False UCAC4 351-162908,18.92134127,-19.9973707,12.67,11.88,11.45,0.0,0,,18.94565980,-19.9664323,5.66,5.64,0,0,0 2330,Ontake,17.53,33.408,3.0583,0,0,2.418,-2.58,,1.6,0 0,28.5172,2024,10,13,130.5029,140.3763,8.6567,0.03394,3.18134,3.07335,11.70,5.0,0.15 1.227,0.0193,0.0033,92,0.0034,Known errors,0.97,0,-1,-1 20241013_162908,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org