IOTA/IOTA-ES occultation update for (913) Otila / UCAC4 494-003631 event on 2024 Jul 23, 01:46 UT Visible from Summary ------- On 2024 Jul 23 UT, the 12.17 km diameter asteroid (913) Otila will occult a 11.4 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.97 mag to 16.39 mag (the magnitude of the asteroid) for at most 0.590 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 Jul 23, 01:42 - 2024 Jul 23, 01:50 * geocentric midpoint of event [JD]: 2460514.57397383 * magnitude of target star: 11.43 * magnitude drop [mag]: 4.97 * estimated maximum duration [s]: 0.590 * Moon: 96 % sunlit, 76° distance * Sun: 81° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.000", 67°) * approx speed of asteroid's shadow [km/s]: 20.7251 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 494-003631 by 913 Otila on 2024 Jul 23 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 - 8 0 0 -45 54 45 1 42 15.2 1 77 -61 -45 58 48 -45 50 42 -46 0 37 -45 48 53 .... - 7 0 0 -45 45 1 1 42 15.3 1 76 -61 -45 49 4 -45 40 58 -45 50 53 -45 39 8 0.41 - 6 0 0 -45 35 4 1 42 15.4 2 75 -60 -45 39 7 -45 31 0 -45 40 56 -45 29 11 0.49 - 5 0 0 -45 24 54 1 42 15.6 3 75 -60 -45 28 57 -45 20 50 -45 30 47 -45 19 1 0.54 - 4 0 0 -45 14 31 1 42 15.9 3 74 -60 -45 18 34 -45 10 27 -45 20 24 -45 8 38 0.56 - 3 0 0 -45 3 55 1 42 16.2 4 73 -60 -45 7 59 -44 59 51 -45 9 49 -44 58 2 0.58 - 2 0 0 -44 53 7 1 42 16.6 5 72 -59 -44 57 11 -44 49 3 -44 59 1 -44 47 13 0.59 - 1 0 0 -44 42 6 1 42 17.0 6 72 -59 -44 46 10 -44 38 2 -44 48 1 -44 36 12 0.60 0 0 0 -44 30 52 1 42 17.5 6 71 -58 -44 34 57 -44 26 48 -44 36 47 -44 24 58 0.60 1 0 0 -44 19 26 1 42 18.0 7 70 -58 -44 23 31 -44 15 22 -44 25 22 -44 13 31 0.61 2 0 0 -44 7 48 1 42 18.7 8 70 -58 -44 11 53 -44 3 43 -44 13 44 -44 1 53 0.61 3 0 0 -43 55 57 1 42 19.4 9 69 -57 -44 0 3 -43 51 52 -44 1 53 -43 50 2 0.62 4 0 0 -43 43 54 1 42 20.1 9 68 -57 -43 48 0 -43 39 49 -43 49 51 -43 37 58 0.62 5 0 0 -43 31 39 1 42 20.9 10 68 -56 -43 35 45 -43 27 34 -43 37 36 -43 25 43 0.62 6 0 0 -43 19 12 1 42 21.8 11 67 -56 -43 23 19 -43 15 7 -43 25 10 -43 13 16 0.63 7 0 0 -43 6 34 1 42 22.8 12 66 -55 -43 10 40 -43 2 27 -43 12 31 -43 0 37 0.63 8 0 0 -42 53 43 1 42 23.8 12 65 -55 -42 57 50 -42 49 37 -42 59 41 -42 47 46 0.63 9 0 0 -42 40 41 1 42 24.9 13 65 -54 -42 44 48 -42 36 34 -42 46 39 -42 34 43 0.63 10 0 0 -42 27 27 1 42 26.1 14 64 -54 -42 31 34 -42 23 20 -42 33 25 -42 21 29 0.63 11 0 0 -42 14 2 1 42 27.3 15 63 -53 -42 18 9 -42 9 55 -42 20 1 -42 8 4 0.63 12 0 0 -42 0 26 1 42 28.6 15 63 -53 -42 4 33 -41 56 19 -42 6 25 -41 54 27 0.63 13 0 0 -41 46 39 1 42 30.0 16 62 -52 -41 50 46 -41 42 31 -41 52 38 -41 40 40 0.64 14 0 0 -41 32 40 1 42 31.4 17 61 -51 -41 36 48 -41 28 33 -41 38 40 -41 26 41 0.64 15 0 0 -41 18 32 1 42 32.9 18 60 -51 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16 285 49 -18 28 54 -18 20 58 -18 30 42 -18 19 11 0.68 141 0 0 -18 29 31 1 50 35.5 15 285 50 -18 33 30 -18 25 33 -18 35 17 -18 23 46 0.68 142 0 0 -18 34 26 1 50 37.1 14 284 50 -18 38 24 -18 30 27 -18 40 11 -18 28 40 0.68 143 0 0 -18 39 39 1 50 38.5 13 284 50 -18 43 37 -18 35 40 -18 45 25 -18 33 53 0.68 144 0 0 -18 45 11 1 50 39.8 12 284 50 -18 49 9 -18 41 12 -18 50 57 -18 39 25 0.68 145 0 0 -18 51 1 1 50 41.0 11 283 50 -18 55 0 -18 47 3 -18 56 48 -18 45 15 0.68 146 0 0 -18 57 11 1 50 42.2 10 283 50 -19 1 9 -18 53 12 -19 2 57 -18 51 24 0.69 147 0 0 -19 3 38 1 50 43.2 9 283 50 -19 7 37 -18 59 39 -19 9 25 -18 57 52 0.69 148 0 0 -19 10 24 1 50 44.1 8 282 50 -19 14 23 -19 6 25 -19 16 11 -19 4 37 0.69 149 0 0 -19 17 28 1 50 44.9 7 282 51 -19 21 27 -19 13 29 -19 23 15 -19 11 41 0.69 150 0 0 -19 24 50 1 50 45.7 6 282 50 -19 28 49 -19 20 50 -19 30 37 -19 19 3 0.70 151 0 0 -19 32 29 1 50 46.3 5 281 50 -19 36 29 -19 28 30 -19 38 17 -19 26 42 0.71 152 0 0 -19 40 26 1 50 46.8 4 281 50 -19 44 26 -19 36 27 -19 46 14 -19 34 39 0.72 153 0 0 -19 48 41 1 50 47.2 3 281 50 -19 52 41 -19 44 41 -19 54 29 -19 42 53 0.73 154 0 0 -19 57 12 1 50 47.5 2 280 50 -20 1 12 -19 53 13 -20 3 1 -19 51 25 0.76 155 0 0 -20 6 1 1 50 47.7 1 280 50 -20 10 1 -20 2 1 -20 11 50 -20 0 13 0.82 156 0 0 -20 15 7 1 50 47.8 1 280 50 -20 19 7 -20 11 6 -20 20 55 -20 9 18 1.11 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 494-003631 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 02 34 03.1372 DE: +08 42 42.330 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 02 34 03.1373 DE: +08 42 42.330 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.4 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (913) Otila asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.01100 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.011", 0.000", 67.077° remarks: * orbital elements for (913)Otila : Mean anomaly = 67.7003726131 deg Arg. of pericenter = 188.5366804842 deg Long. of node = 94.9095267814 deg Inclination = 5.8045295329 deg Eccentricity = 0.1701587648 Semimajor axis = 2.1973923667 AU Perihelion dist = 1.8234867958 AU Mag: H = 11.99, G = 0.15 Epoch of elements : MJD 60514.07397370 TDT (2024 Jul 23.0740) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.59,2024,7,23,1.775372,0.124492,-0.537323,11.397019,2.635807,-0.004818,-0.001664,0.000000,0.000000 70.9114,8.8202,155.00,20.00,False UCAC4 494-003631,2.56753809,8.7117581,12.09,11.43,11.07,0.0,0,,2.58928009,8.8201710,4.97,4.87,0,0,0 913,Otila,16.39,12.170,2.0110,0,0,3.363,11.53,,0.8,0 0,67.3754,2024,7,22,188.5367,94.9095,5.8045,0.17016,2.19739,1.82349,11.99,5.0,0.15 1.225,0.0107,0.0005,67,0.0019,Known errors,1.10,0,-1,-1 20240723_003631,60140.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org