IOTA/IOTA-ES occultation update for (694) Ekard / UCAC4 461-030760 event on 2024 Jan 10, 00:11 UT Visible from Summary ------- On 2024 Jan 10 UT, the 97.662 km diameter asteroid (694) Ekard will occult a 11.6 mag star in the constellation Canis Minor for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.18 mag to 13.63 mag (the magnitude of the asteroid) for at most 6.460 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 Jan 10, 00:05 - 2024 Jan 10, 00:17 * geocentric midpoint of event [JD]: 2460319.50779242 * magnitude of target star: 11.61 * magnitude drop [mag]: 2.18 * estimated maximum duration [s]: 6.460 * Moon: 3 % sunlit, 149° distance * Sun: 160° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 117 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.019) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.018", 103°) * approx speed of asteroid's shadow [km/s]: 15.1269 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 461-030760 by 694 Ekard on 2024 Jan 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 - 94 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -31 40 17 .. .. .. .... - 93 0 0 -32 27 45 0 17 3.7 1 87 12 -31 55 59 -32 59 43 -31 38 13 -33 17 47 .... - 92 0 0 -32 25 43 0 17 3.5 2 87 11 -31 53 57 -32 57 41 -31 36 11 -33 15 44 0.49 - 91 0 0 -32 23 42 0 17 3.2 2 86 10 -31 51 56 -32 55 40 -31 34 10 -33 13 43 0.55 - 90 0 0 -32 21 43 0 17 2.9 3 86 10 -31 49 57 -32 53 41 -31 32 11 -33 11 44 0.58 - 89 0 0 -32 19 46 0 17 2.4 4 85 9 -31 48 0 -32 51 44 -31 30 14 -33 9 47 0.60 - 88 0 0 -32 17 51 0 17 1.8 5 84 8 -31 46 5 -32 49 48 -31 28 19 -33 7 52 0.61 - 87 0 0 -32 15 57 0 17 1.1 6 84 7 -31 44 11 -32 47 55 -31 26 25 -33 5 58 0.62 - 86 0 0 -32 14 5 0 17 0.3 7 83 6 -31 42 20 -32 46 3 -31 24 33 -33 4 6 0.62 - 85 0 0 -32 12 15 0 16 59.3 8 83 6 -31 40 30 -32 44 13 -31 22 43 -33 2 16 0.63 - 84 0 0 -32 10 27 0 16 58.3 8 82 5 -31 38 42 -32 42 25 -31 20 55 -33 0 28 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0.70 78 0 0 -34 54 42 0 5 26.5 7 277 3 -34 22 56 -35 26 40 -34 5 10 -35 44 44 0.71 79 0 0 -34 56 57 0 5 25.7 6 277 4 -34 25 11 -35 28 55 -34 7 24 -35 46 58 0.71 80 0 0 -34 59 10 0 5 24.9 5 276 4 -34 27 24 -35 31 8 -34 9 38 -35 49 11 0.72 81 0 0 -35 1 22 0 5 24.3 4 275 5 -34 29 36 -35 33 20 -34 11 50 -35 51 23 0.73 82 0 0 -35 3 33 0 5 23.8 4 275 6 -34 31 48 -35 35 31 -34 14 1 -35 53 34 0.74 83 0 0 -35 5 43 0 5 23.4 3 274 7 -34 33 57 -35 37 41 -34 16 11 -35 55 44 0.76 84 0 0 -35 7 52 0 5 23.2 2 274 7 -34 36 6 -35 39 49 -34 18 20 -35 57 52 0.80 85 0 0 -35 9 59 0 5 23.0 1 273 8 -34 38 13 -35 41 56 -34 20 27 -35 59 59 0.90 86 0 0 -35 12 4 0 5 22.9 0 273 9 -34 40 19 -35 44 2 -34 22 33 -36 2 5 1.59 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: UCAC4 461-030760 * constellation : Canis Minor * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 11 06.1474 DE: +02 00 43.283 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 11 06.1474 DE: +02 00 43.283 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (694) Ekard asteroid class: approx. diameter [km]: 98 approx. diameter ["]: 0.066 distance from Earth [AU]: 2.04560 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 27 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): 0.022", 0.018", 102.975° remarks: * orbital elements for (694)Ekard : Mean anomaly = 94.4280811693 deg Arg. of pericenter = 111.7747826320 deg Long. of node = 229.9633438542 deg Inclination = 15.8990622661 deg Eccentricity = 0.3232006201 Semimajor axis = 2.6694542552 AU Perihelion dist = 1.8066849846 AU Mag: H = 9.20, G = 0.15 Epoch of elements : MJD 60319.00779234 TDT (2024 Jan 10.0078) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr27,6.46,2024,1,10,0.187018,-0.013093,-0.554125,-8.535638,0.201676,0.000254,0.002080,0.000002,0.000000 -3.7428,1.9724,178.98,-22.06,False UCAC4 461-030760,7.18504095,2.0120231,12.23,11.61,11.28,0.0,0,,7.20615232,1.9723734,2.18,2.08,0,0,0 694,Ekard,13.63,97.662,2.0456,0,0,-2.447,0.87,,4.8,0 0,94.2003,2024,1,9,111.7748,229.9633,15.8991,0.32320,2.66945,1.80668,9.20,5.0,0.15 1.281,0.0223,0.0183,103,0.0185,Known errors,1.02,0,-1,-1 20240110_030760,60137.01 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org