IOTA/IOTA-ES occultation update for (342) Endymion / UCAC4 557-007460 event on 2024 Jul 16, 04:08 UT Visible from Summary ------- On 2024 Jul 16 UT, the 59.8219177569284 km diameter asteroid (342) Endymion will occult a 11.8 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.59 mag to 15.37 mag (the magnitude of the asteroid) for at most 1.690 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 16, 04:06 - 2024 Jul 16, 04:11 * geocentric midpoint of event [JD]: 2460507.67264662 * magnitude of target star: 11.82 * magnitude drop [mag]: 3.59 * estimated maximum duration [s]: 1.690 * Moon: 70 % sunlit, 170° distance * Sun: 56° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 75 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.010", 85°) * approx speed of asteroid's shadow [km/s]: 35.6086 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 557-007460 by 342 Endymion on 2024 Jul 16 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 - 9 0 0 -42 35 32 4 6 13.3 0 60 -43 -42 58 55 -42 12 19 -43 14 22 -41 57 5 .... - 8 0 0 -42 10 3 4 6 13.3 1 59 -42 -42 33 25 -41 46 48 -42 48 53 -41 31 34 0.31 - 7 0 0 -41 44 20 4 6 13.4 2 59 -41 -42 7 43 -41 21 5 -42 23 11 -41 5 51 0.49 - 6 0 0 -41 18 26 4 6 13.5 3 58 -41 -41 41 49 -40 55 10 -41 57 17 -40 39 56 0.56 - 5 0 0 -40 52 20 4 6 13.7 4 57 -40 -41 15 43 -40 29 4 -41 31 12 -40 13 50 0.60 - 4 0 0 -40 26 3 4 6 14.0 5 57 -39 -40 49 27 -40 2 48 -41 4 56 -39 47 34 0.63 - 3 0 0 -39 59 37 4 6 14.3 6 56 -38 -40 23 0 -39 36 22 -40 38 29 -39 21 7 0.65 - 2 0 0 -39 33 1 4 6 14.6 6 55 -38 -39 56 24 -39 9 46 -40 11 53 -38 54 32 0.66 - 1 0 0 -39 6 17 4 6 15.0 7 55 -37 -39 29 39 -38 43 2 -39 45 8 -38 27 48 0.67 0 0 0 -38 39 24 4 6 15.5 8 54 -36 -39 2 46 -38 16 10 -39 18 14 -38 0 56 0.68 1 0 0 -38 12 24 4 6 16.0 9 54 -35 -38 35 46 -37 49 11 -38 51 13 -37 33 57 0.68 2 0 0 -37 45 18 4 6 16.6 10 53 -35 -38 8 39 -37 22 5 -38 24 6 -37 6 52 0.69 3 0 0 -37 18 6 4 6 17.3 11 52 -34 -37 41 26 -36 54 54 -37 56 52 -36 39 42 0.69 4 0 0 -36 50 49 4 6 18.0 12 52 -33 -37 14 8 -36 27 38 -37 29 34 -36 12 27 0.70 5 0 0 -36 23 28 4 6 18.7 13 51 -32 -36 46 46 -36 0 18 -37 2 11 -35 45 7 0.70 6 0 0 -35 56 4 4 6 19.6 14 50 -31 -36 19 20 -35 32 55 -36 34 44 -35 17 45 0.70 7 0 0 -35 28 37 4 6 20.5 15 50 -30 -35 51 52 -35 5 29 -36 7 15 -34 50 20 0.70 8 0 0 -35 1 8 4 6 21.4 16 49 -30 -35 24 22 -34 38 2 -35 39 44 -34 22 54 0.71 9 0 0 -34 33 38 4 6 22.4 16 48 -29 -34 56 50 -34 10 34 -35 12 11 -33 55 27 0.71 10 0 0 -34 6 9 4 6 23.5 17 48 -28 -34 29 19 -33 43 6 -34 44 39 -33 28 0 0.71 11 0 0 -33 38 40 4 6 24.6 18 47 -27 -34 1 48 -33 15 39 -34 17 6 -33 0 35 0.71 12 0 0 -33 11 12 4 6 25.8 19 47 -26 -33 34 19 -32 48 14 -33 49 36 -32 33 11 0.71 13 0 0 -32 43 48 4 6 27.1 20 46 -25 -33 6 52 -32 20 51 -33 22 8 -32 5 49 0.72 14 0 0 -32 16 26 4 6 28.4 21 45 -24 -32 39 28 -31 53 32 -32 54 42 -31 38 31 0.72 15 0 0 -31 49 9 4 6 29.8 22 45 -23 -32 12 8 -31 26 17 -32 27 21 -31 11 17 0.72 16 0 0 -31 21 56 4 6 31.2 23 44 -22 -31 44 54 -30 59 7 -32 0 5 -30 44 9 0.72 17 0 0 -30 54 50 4 6 32.7 24 43 -21 -31 17 45 -30 32 2 -31 32 54 -30 17 6 0.72 18 0 0 -30 27 50 4 6 34.3 25 43 -20 -30 50 42 -30 5 5 -31 5 50 -29 50 11 0.72 19 0 0 -30 0 57 4 6 35.9 26 42 -19 -30 23 47 -29 38 15 -30 38 53 -29 23 22 0.72 20 0 0 -29 34 13 4 6 37.6 27 41 -18 -29 57 0 -29 11 34 -30 12 4 -28 56 43 0.72 21 0 0 -29 7 38 4 6 39.3 27 41 -18 -29 30 23 -28 45 2 -29 45 25 -28 30 12 0.72 22 0 0 -28 41 13 4 6 41.1 28 40 -17 -29 3 55 -28 18 39 -29 18 55 -28 3 52 0.72 23 0 0 -28 14 59 4 6 43.0 29 39 -16 -28 37 37 -27 52 28 -28 52 36 -27 37 42 0.73 24 0 0 -27 48 56 4 6 44.9 30 39 -15 -28 11 32 -27 26 28 -28 26 28 -27 11 44 0.73 25 0 0 -27 23 6 4 6 46.8 31 38 -14 -27 45 38 -27 0 41 -28 0 33 -26 45 59 0.73 26 0 0 -26 57 28 4 6 48.9 32 37 -13 -27 19 58 -26 35 6 -27 34 50 -26 20 26 0.73 27 0 0 -26 32 5 4 6 50.9 33 36 -12 -26 54 31 -26 9 46 -27 9 21 -25 55 8 0.73 28 0 0 -26 6 56 4 6 53.1 34 36 -11 -26 29 19 -25 44 40 -26 44 7 -25 30 4 0.73 29 0 0 -25 42 2 4 6 55.2 35 35 -10 -26 4 22 -25 19 49 -26 19 8 -25 5 15 0.73 30 0 0 -25 17 24 4 6 57.5 35 34 -9 -25 39 41 -24 55 14 -25 54 25 -24 40 43 0.73 31 0 0 -24 53 3 4 6 59.8 36 33 -8 -25 15 17 -24 30 57 -25 29 59 -24 16 27 0.73 32 0 0 -24 28 59 4 7 2.1 37 32 -7 -24 51 10 -24 6 56 -25 5 49 -23 52 28 0.73 33 0 0 -24 5 14 4 7 4.5 38 32 -6 -24 27 21 -23 43 13 -24 41 58 -23 28 48 0.73 34 0 0 -23 41 46 4 7 6.9 39 31 -5 -24 3 50 -23 19 49 -24 18 26 -23 5 26 0.73 35 0 0 -23 18 39 4 7 9.4 40 30 -4 -23 40 39 -22 56 45 -23 55 12 -22 42 23 0.73 36 0 0 -22 55 51 4 7 11.9 40 29 -3 -23 17 48 -22 34 0 -23 32 19 -22 19 40 0.73 37 0 0 -22 33 23 4 7 14.4 41 28 -2 -22 55 17 -22 11 35 -23 9 46 -21 57 18 0.73 38 0 0 -22 11 16 4 7 17.0 42 27 -1 -22 33 7 -21 49 32 -22 47 34 -21 35 17 0.74 39 0 0 -21 49 31 4 7 19.6 43 26 0 -22 11 19 -21 27 50 -22 25 44 -21 13 37 0.74 40 0 0 -21 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 557-007460 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 40 43.1747 DE: +21 19 46.263 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 40 43.1747 DE: +21 19 46.263 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (342) Endymion asteroid class: approx. diameter [km]: 60 approx. diameter ["]: 0.030 distance from Earth [AU]: 2.78630 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#65 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", 0.010", 85.1° remarks: * orbital elements for (342)Endymion : Mean anomaly = 312.0000640797 deg Arg. of pericenter = 224.6354233387 deg Long. of node = 232.6493344314 deg Inclination = 7.3541967622 deg Eccentricity = 0.1304114637 Semimajor axis = 2.5686063485 AU Perihelion dist = 2.2336306350 AU Mag: H = 10.24, G = 0.15 Epoch of elements : MJD 60507.17264696 TDT (2024 Jul 16.1726) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#652023Apr24,1.69,2024,7,16,4.143519,0.102844,-0.588513,19.801990,3.439665,-0.004363,-0.000917,-0.000001,0.000000 58.8863,21.4081,119.38,21.28,False UCAC4 557-007460,3.67865958,21.3295173,12.73,11.82,11.33,0.1,4,K,3.70225319,21.4081402,3.59,3.63,0,0,0 342,Endymion,15.37,60.024,2.7863,0,0,4.476,10.85,,3.4,0 0,311.9587,2024,7,16,224.6354,232.6493,7.3542,0.13041,2.56861,2.23363,10.24,5.0,0.15 1.329,0.0187,0.0097,85,0.0098,Known errors,0.98,0,-1,-1 20240716_007460,60140.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org