IOTA/IOTA-ES occultation update for (21065) Jamesmelka / G173532.9-161111 event on 2024 Oct 31, 10:39 UT Visible from Summary ------- On 2024 Oct 31 UT, the 15.2185149016931 km diameter asteroid (21065) Jamesmelka will occult a 10.8 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.36 mag to 18.19 mag (the magnitude of the asteroid) for at most 0.780 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: 98 * date and approx. time of event: 2024 Oct 31, 10:36 - 2024 Oct 31, 10:41 * geocentric midpoint of event [JD]: 2460614.94387245 * magnitude of target star: 10.83 * magnitude drop [mag]: 2.08 * estimated maximum duration [s]: 0.780 * Moon: 1 % sunlit, 58° distance * Sun: 46° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.002", 75°) * approx speed of asteroid's shadow [km/s]: 40.4306 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G173532.9-161111 by 21065 Jamesmelka on 2024 Oct 31 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 - 33 0 0 -27 31 33 10 36 49.3 1 108 42 -27 41 40 -27 21 28 -27 48 35 -27 14 34 - 27 31 8 - 27 31 58 .... - 32 0 0 -27 49 13 10 36 49.3 2 107 43 -27 59 20 -27 39 8 -28 6 15 -27 32 14 - 27 48 49 - 27 49 38 0.43 - 31 0 0 -28 6 51 10 36 49.5 3 107 44 -28 16 57 -27 56 45 -28 23 52 -27 49 52 - 28 6 26 - 28 7 15 0.46 - 30 0 0 -28 24 25 10 36 49.6 4 107 45 -28 34 31 -28 14 19 -28 41 26 -28 7 26 - 28 24 0 - 28 24 49 0.47 - 29 0 0 -28 41 55 10 36 49.8 4 106 45 -28 52 1 -28 31 49 -28 58 56 -28 24 56 - 28 41 30 - 28 42 19 0.47 - 28 0 0 -28 59 21 10 36 50.1 5 106 46 -29 9 27 -28 49 16 -29 16 22 -28 42 22 - 28 58 56 - 28 59 45 0.48 - 27 0 0 -29 16 42 10 36 50.3 6 105 47 -29 26 48 -29 6 37 -29 33 43 -28 59 44 - 29 16 18 - 29 17 7 0.48 - 26 0 0 -29 33 59 10 36 50.7 7 105 48 -29 44 5 -29 23 54 -29 51 0 -29 17 1 - 29 33 34 - 29 34 24 0.48 - 25 0 0 -29 51 11 10 36 51.1 8 104 49 -30 1 16 -29 41 6 -30 8 11 -29 34 13 - 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27 49 41 - 27 50 31 0.52 146 0 0 -27 32 23 10 41 26.9 14 259 -26 -27 42 29 -27 22 17 -27 49 25 -27 15 24 - 27 31 58 - 27 32 48 0.52 147 0 0 -27 14 37 10 41 27.6 13 258 -27 -27 24 44 -27 4 31 -27 31 39 -26 57 38 - 27 14 12 - 27 15 2 0.52 148 0 0 -26 56 49 10 41 28.2 12 258 -28 -27 6 56 -26 46 43 -27 13 51 -26 39 50 - 26 56 24 - 26 57 14 0.52 149 0 0 -26 38 59 10 41 28.8 11 257 -29 -26 49 6 -26 28 54 -26 56 1 -26 22 0 - 26 38 34 - 26 39 24 0.53 150 0 0 -26 21 8 10 41 29.4 10 257 -30 -26 31 14 -26 11 2 -26 38 9 -26 4 9 - 26 20 43 - 26 21 32 0.53 151 0 0 -26 3 15 10 41 29.9 9 256 -31 -26 13 22 -25 53 10 -26 20 17 -25 46 16 - 26 2 51 - 26 3 40 0.53 152 0 0 -25 45 22 10 41 30.3 8 256 -32 -25 55 28 -25 35 17 -26 2 23 -25 28 23 - 25 44 57 - 25 45 47 0.54 153 0 0 -25 27 29 10 41 30.7 7 256 -33 -25 37 35 -25 17 23 -25 44 30 -25 10 30 - 25 27 4 - 25 27 53 0.54 154 0 0 -25 9 35 10 41 31.1 6 255 -34 -25 19 41 -24 59 30 -25 26 36 -24 52 37 - 25 9 11 - 25 10 0 0.55 155 0 0 -24 51 43 10 41 31.4 5 255 -34 -25 1 48 -24 41 38 -25 8 43 -24 34 45 - 24 51 18 - 24 52 7 0.56 156 0 0 -24 33 51 10 41 31.6 5 254 -35 -24 43 56 -24 23 46 -24 50 51 -24 16 53 - 24 33 26 - 24 34 15 0.58 157 0 0 -24 16 0 10 41 31.8 4 254 -36 -24 26 6 -24 5 56 -24 33 0 -23 59 3 - 24 15 35 - 24 16 25 0.60 158 0 0 -23 58 11 10 41 32.0 3 253 -37 -24 8 17 -23 48 7 -24 15 11 -23 41 14 - 23 57 47 - 23 58 36 0.63 159 0 0 -23 40 25 10 41 32.1 2 253 -38 -23 50 30 -23 30 21 -23 57 24 -23 23 28 - 23 40 0 - 23 40 49 0.72 160 0 0 -23 22 41 10 41 32.2 1 253 -39 -23 32 45 -23 12 37 -23 39 39 -23 5 44 - 23 22 16 - 23 23 5 1.02 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: G173532.9-161111 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 35 32.8744 DE: -16 11 11.015 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 35 32.8744 DE: -16 11 11.015 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.700,0.500) * V mag [mag]: 10.8 * B mag [mag]: 14.3 * Diameter [mas]: 7.40 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (21065) Jamesmelka asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.06940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 date of fit: 2023 Apr 25 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): 0.021", 0.001", 75.291° remarks: * orbital elements for (21065)Jamesmelka : Mean anomaly = 3.3589395643 deg Arg. of pericenter = 27.1621942755 deg Long. of node = 249.6401299686 deg Inclination = 16.5903526134 deg Eccentricity = 0.2071907833 Semimajor axis = 3.1386213706 AU Perihelion dist = 2.4883279504 AU Mag: H = 12.89, G = 0.15 Epoch of elements : MJD 60614.44387221 TDT (2024 Oct 31.4439) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr25,0.78,2024,10,31,10.652939,0.015792,-0.440994,22.803892,0.861037,0.004156,0.000330,-0.000001,0.000000 64.2197,-16.2025,16.11,-14.34,False G173532.9-161111,17.59246517,-16.1863929,14.32,10.83,8.95,7.4,4,,17.61599588,-16.2025460,2.05,2.05,0,0,0 21065,Jamesmelka,18.19,31.692,3.0694,0,0,4.536,2.47,,1.4,0 0,3.2803,2024,10,31,27.1622,249.6401,16.5904,0.20719,3.13862,2.48833,12.88,5.0,0.15 1.342,0.0213,0.0015,75,0.0049,Known errors,1.01,0,-1,-1 20241031_161111,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org