IOTA/IOTA-ES occultation update for (993) Moultona / UCAC4 524-049114 event on 2024 Oct 10, 03:38 UT Visible from Summary ------- On 2024 Oct 10 UT, the 13.254 km diameter asteroid (993) Moultona will occult a 11.6 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.50 mag to 17.11 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: 100 * date and approx. time of event: 2024 Oct 10, 03:35 - 2024 Oct 10, 03:41 * geocentric midpoint of event [JD]: 2460593.65170367 * magnitude of target star: 11.62 * magnitude drop [mag]: 5.50 * estimated maximum duration [s]: 0.430 * Moon: 43 % sunlit, 143° distance * Sun: 61° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.000", 106°) * approx speed of asteroid's shadow [km/s]: 30.9152 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 524-049114 by 993 Moultona on 2024 Oct 10 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 - 26 0 0 4 3 45 3 35 6.8 0 75 -59 3 59 56 4 7 34 3 59 11 4 8 19 .... - 25 0 0 4 19 20 3 35 6.9 1 75 -58 4 15 31 4 23 9 4 14 47 4 23 54 0.04 - 24 0 0 4 34 33 3 35 7.0 2 75 -57 4 30 45 4 38 22 4 30 0 4 39 6 0.14 - 23 0 0 4 49 24 3 35 7.1 3 76 -56 4 45 36 4 53 13 4 44 52 4 53 57 0.17 - 22 0 0 5 3 53 3 35 7.4 4 76 -55 5 0 5 5 7 41 4 59 21 5 8 25 0.19 - 21 0 0 5 18 0 3 35 7.7 5 76 -54 5 14 12 5 21 47 5 13 28 5 22 31 0.20 - 20 0 0 5 31 43 3 35 8.1 6 76 -53 5 27 56 5 35 31 5 27 12 5 36 15 0.21 - 19 0 0 5 45 4 3 35 8.5 7 76 -52 5 41 17 5 48 51 5 40 33 5 49 35 0.21 - 18 0 0 5 58 2 3 35 9.0 8 76 -51 5 54 15 6 1 49 5 53 31 6 2 33 0.22 - 17 0 0 6 10 37 3 35 9.6 9 76 -50 6 6 50 6 14 23 6 6 6 6 15 7 0.22 - 16 0 0 6 22 48 3 35 10.2 10 76 -49 6 19 2 6 26 34 6 18 18 6 27 18 0.22 - 15 0 0 6 34 36 3 35 10.9 11 76 -48 6 30 50 6 38 22 6 30 6 6 39 6 0.22 - 14 0 0 6 46 0 3 35 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47 9 14 40 9 23 30 0.24 15 0 0 9 18 28 3 35 59.6 41 79 -19 9 14 46 9 22 10 9 14 3 9 22 53 0.24 16 0 0 9 17 26 3 36 2.1 42 79 -18 9 13 44 9 21 8 9 13 1 9 21 51 0.24 17 0 0 9 15 58 3 36 4.6 43 79 -17 9 12 16 9 19 40 9 11 33 9 20 23 0.24 18 0 0 9 14 5 3 36 7.1 44 78 -16 9 10 23 9 17 47 9 9 40 9 18 30 0.24 19 0 0 9 11 47 3 36 9.7 45 78 -15 9 8 4 9 15 29 9 7 21 9 16 12 0.24 20 0 0 9 9 2 3 36 12.4 46 78 -14 9 5 20 9 12 45 9 4 37 9 13 28 0.24 21 0 0 9 5 53 3 36 15.1 47 78 -13 9 2 10 9 9 35 9 1 27 9 10 18 0.24 22 0 0 9 2 18 3 36 17.8 48 78 -12 8 58 35 9 6 0 8 57 52 9 6 43 0.24 23 0 0 8 58 17 3 36 20.6 49 78 -11 8 54 35 9 1 59 8 53 51 9 2 43 0.24 24 0 0 8 53 51 3 36 23.4 50 78 -10 8 50 8 8 57 34 8 49 25 8 58 17 0.24 25 0 0 8 48 59 3 36 26.2 51 78 -9 8 45 17 8 52 42 8 44 33 8 53 25 0.24 26 0 0 8 43 43 3 36 29.1 52 77 -8 8 40 0 8 47 25 8 39 16 8 48 9 0.24 27 0 0 8 38 0 3 36 32.1 53 77 -7 8 34 17 8 41 43 8 33 34 8 42 27 0.24 28 0 0 8 31 53 3 36 35.1 54 77 -6 8 28 9 8 35 36 8 27 26 8 36 19 0.24 29 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-26 57 14 -27 5 51 -26 56 28 0.24 134 0 0 -27 20 36 3 41 44.6 10 292 66 -27 24 31 -27 16 40 -27 25 17 -27 15 55 0.24 135 0 0 -27 39 44 3 41 45.2 9 292 65 -27 43 39 -27 35 49 -27 44 25 -27 35 3 0.24 136 0 0 -27 58 34 3 41 45.7 8 291 65 -28 2 28 -27 54 39 -28 3 14 -27 53 54 0.24 137 0 0 -28 17 5 3 41 46.1 7 291 64 -28 20 59 -28 13 11 -28 21 45 -28 12 25 0.24 138 0 0 -28 35 17 3 41 46.5 6 290 63 -28 39 11 -28 31 23 -28 39 57 -28 30 38 0.24 139 0 0 -28 53 11 3 41 46.8 5 290 62 -28 57 4 -28 49 17 -28 57 50 -28 48 32 0.24 140 0 0 -29 10 45 3 41 47.1 4 289 62 -29 14 38 -29 6 52 -29 15 24 -29 6 7 0.24 141 0 0 -29 28 0 3 41 47.3 3 289 61 -29 31 53 -29 24 7 -29 32 38 -29 23 22 0.24 142 0 0 -29 44 56 3 41 47.5 2 288 60 -29 48 48 -29 41 3 -29 49 33 -29 40 18 0.24 143 0 0 -30 1 32 3 41 47.6 1 288 59 -30 5 24 -29 57 40 -30 6 9 -29 56 55 0.24 144 0 0 -30 17 48 3 41 47.7 0 287 58 -30 21 40 -30 13 56 -30 22 25 -30 13 12 0.24 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 524-049114 * constellation : Cancer * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 10 42.2038 DE: +14 44 38.085 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 10 42.2040 DE: +14 44 38.084 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.6 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (993) Moultona asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.10360 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 date of fit: 2023 Feb 11 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", 106.148° remarks: * orbital elements for (993)Moultona : Mean anomaly = 44.2300654576 deg Arg. of pericenter = 244.7984940663 deg Long. of node = 184.2110951991 deg Inclination = 1.7819492020 deg Eccentricity = 0.0473528914 Semimajor axis = 2.8608192122 AU Perihelion dist = 2.7253511508 AU Mag: H = 11.49, G = 0.15 Epoch of elements : MJD 60593.15170338 TDT (2024 Oct 10.1517) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Feb11,0.43,2024,10,10,3.640888,-0.072485,-0.224018,16.616397,-5.327000,-0.004865,0.001436,-0.000001,0.000000 64.1617,14.6445,122.13,-6.81,False UCAC4 524-049114,9.17838991,14.7439127,11.92,11.62,11.46,0.0,0,,9.20098297,14.6445408,5.50,5.21,0,0,0 993,Moultona,17.11,13.254,3.1036,0,0,3.245,-15.10,,1.4,0 0,44.1992,2024,10,10,244.7985,184.2111,1.7819,0.04735,2.86082,2.72535,11.49,5.0,0.15 1.097,0.0107,0.0005,106,0.0006,Known errors,1.01,0,-1,-1 20241010_049114,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org