IOTA/IOTA-ES occultation update for (56) Melete / UCAC4 367-120753 event on 2024 Oct 30, 08:55 UT Visible from Summary ------- On 2024 Oct 30 UT, the 111.006178682411 km diameter asteroid (56) Melete will occult a 9.9 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 3.20 mag to 12.99 mag (the magnitude of the asteroid) for at most 2.920 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 30, 08:52 - 2024 Oct 30, 08:58 * geocentric midpoint of event [JD]: 2460613.87202391 * magnitude of target star: 9.85 * magnitude drop [mag]: 3.20 * estimated maximum duration [s]: 2.920 * Moon: 4 % sunlit, 81° distance * Sun: 58° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 112 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 87°) * approx speed of asteroid's shadow [km/s]: 38.0459 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 367-120753 by 56 Melete on 2024 Oct 30 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 15 0 0 7 46 3 8 52 56.2 0 107 55 7 14 22 .. .. .. 7 12 22 .. .. .. .... 16 0 0 7 27 48 8 52 56.3 1 107 56 6 56 7 7 59 31 6 54 7 8 1 32 0.04 17 0 0 7 9 32 8 52 56.3 2 107 57 6 37 50 7 41 15 6 35 50 7 43 15 -0.03 18 0 0 6 51 13 8 52 56.5 3 107 58 6 19 31 7 22 56 6 17 31 7 24 56 -0.05 19 0 0 6 32 52 8 52 56.7 4 107 59 6 1 11 7 4 36 5 59 11 7 6 36 -0.06 20 0 0 6 14 31 8 52 56.9 5 108 60 5 42 49 6 46 14 5 40 49 6 48 15 -0.07 21 0 0 5 56 9 8 52 57.3 6 108 61 5 24 27 6 27 52 5 22 27 6 29 52 -0.08 22 0 0 5 37 46 8 52 57.6 7 108 62 5 6 5 6 9 29 5 4 4 6 11 30 -0.08 23 0 0 5 19 23 8 52 58.0 8 108 63 4 47 42 5 51 7 4 45 42 5 53 7 -0.08 24 0 0 5 1 1 8 52 58.5 9 108 63 4 29 20 5 32 44 4 27 20 5 34 45 -0.09 25 0 0 4 42 40 8 52 59.0 11 108 64 4 10 59 5 14 23 4 8 59 5 16 23 -0.09 26 0 0 4 24 20 8 52 59.6 12 108 65 3 52 40 4 56 3 3 50 39 4 58 3 -0.09 27 0 0 4 6 2 8 53 0.3 13 108 66 3 34 22 4 37 44 3 32 21 4 39 44 -0.09 28 0 0 3 47 46 8 53 1.0 14 108 67 3 16 6 4 19 27 3 14 6 4 21 28 -0.09 29 0 0 3 29 32 8 53 1.7 15 108 68 2 57 52 4 1 13 2 55 52 4 3 14 -0.09 30 0 0 3 11 21 8 53 2.5 16 108 69 2 39 42 3 43 2 2 37 42 3 45 2 -0.09 31 0 0 2 53 13 8 53 3.4 17 108 70 2 21 35 3 24 54 2 19 35 3 26 54 -0.09 32 0 0 2 35 9 8 53 4.3 18 109 70 2 3 31 3 6 49 2 1 31 3 8 49 -0.09 33 0 0 2 17 9 8 53 5.3 19 109 71 1 45 32 2 48 49 1 43 32 2 50 49 -0.09 34 0 0 1 59 14 8 53 6.3 20 109 72 1 27 37 2 30 52 1 25 38 2 32 53 -0.10 35 0 0 1 41 23 8 53 7.4 21 109 73 1 9 48 2 13 1 1 7 48 2 15 1 -0.10 36 0 0 1 23 38 8 53 8.5 22 109 73 0 52 3 1 55 15 0 50 3 1 57 15 -0.10 37 0 0 1 5 58 8 53 9.7 23 109 74 0 34 24 1 37 34 0 32 24 1 39 34 -0.10 38 0 0 0 48 25 8 53 10.9 24 109 75 0 16 51 1 20 0 0 14 52 1 22 0 -0.10 39 0 0 0 30 57 8 53 12.2 25 109 75 - 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Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 367-120753 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 18 23.6711 DE: -16 46 49.776 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 18 23.6710 DE: -16 46 49.777 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.9 * B mag [mag]: 10.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (56) Melete asteroid class: approx. diameter [km]: 111 approx. diameter ["]: 0.066 distance from Earth [AU]: 2.32770 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#129 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): 0.009", 0.002", 87.223° remarks: * orbital elements for (56)Melete : Mean anomaly = 0.9880349422 deg Arg. of pericenter = 104.8956398894 deg Long. of node = 192.9365155528 deg Inclination = 8.0812203257 deg Eccentricity = 0.2371194295 Semimajor axis = 2.5971842246 AU Perihelion dist = 1.9813413831 AU Mag: H = 8.53, G = 0.15 Epoch of elements : MJD 60613.37202367 TDT (2024 Oct 30.3720) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1292023Apr24,2.92,2024,10,30,8.928574,0.003391,0.105443,21.460619,-0.762919,0.004512,0.000487,-0.000001,0.000000 101.8558,-16.7711,41.98,-13.99,False UCAC4 367-120753,18.30657535,-16.7804934,10.53,9.85,9.48,0.1,0,,18.33027863,-16.7711471,3.20,3.12,0,0,0 56,Melete,12.99,111.175,2.3277,0,0,5.645,-2.88,,5.6,0 0,0.9004,2024,10,30,104.8956,192.9365,8.0812,0.23712,2.59718,1.98134,8.52,5.0,0.15 1.032,0.0093,0.0019,87,0.0021,Known errors,0.91,0,-1,-1 20241030_120753,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org