IOTA/IOTA-ES occultation update for (9853) l'Epee / TYC 270-00471-1 event on 2024 Nov 17, 17:39 UT Visible from Summary ------- On 2024 Nov 17 UT, the 10.9846704629621 km diameter asteroid (9853) l'Epee will occult a 10.8 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.13 mag to 18.89 mag (the magnitude of the asteroid) for at most 0.420 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: 95 * date and approx. time of event: 2024 Nov 17, 17:35 - 2024 Nov 17, 17:42 * geocentric midpoint of event [JD]: 2460632.23542200 * magnitude of target star: 10.76 * magnitude drop [mag]: 8.13 * estimated maximum duration [s]: 0.420 * Moon: 95 % sunlit, 88° distance * Sun: 66° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 95°) * approx speed of asteroid's shadow [km/s]: 26.8472 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 270-00471-1 by 9853 l'Epee on 2024 Nov 17 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 123 0 0 -30 3 15 17 36 3.4 0 84 -33 -30 7 21 -29 59 9 -30 10 58 -29 55 33 .... 124 0 0 -29 57 44 17 36 3.5 1 83 -32 -30 1 51 -29 53 38 -30 5 27 -29 50 2 0.42 125 0 0 -29 52 29 17 36 3.6 2 83 -32 -29 56 35 -29 48 23 -30 0 12 -29 44 48 0.65 126 0 0 -29 47 30 17 36 3.8 3 82 -31 -29 51 36 -29 43 24 -29 55 12 -29 39 48 0.73 127 0 0 -29 42 46 17 36 4.0 4 82 -31 -29 46 51 -29 38 40 -29 50 28 -29 35 4 0.77 128 0 0 -29 38 17 17 36 4.4 4 81 -30 -29 42 23 -29 34 12 -29 45 59 -29 30 36 0.80 129 0 0 -29 34 5 17 36 4.8 5 81 -30 -29 38 10 -29 29 59 -29 41 47 -29 26 24 0.81 130 0 0 -29 30 8 17 36 5.3 6 80 -29 -29 34 14 -29 26 3 -29 37 50 -29 22 27 0.82 131 0 0 -29 26 27 17 36 5.8 7 80 -29 -29 30 33 -29 22 22 -29 34 9 -29 18 47 0.83 132 0 0 -29 23 3 17 36 6.5 8 79 -28 -29 27 8 -29 18 57 -29 30 44 -29 15 22 0.84 133 0 0 -29 19 54 17 36 7.2 9 79 -28 -29 24 0 -29 15 49 -29 27 36 -29 12 14 0.85 134 0 0 -29 17 2 17 36 8.0 10 78 -27 -29 21 8 -29 12 57 -29 24 43 -29 9 22 0.85 135 0 0 -29 14 26 17 36 8.8 11 78 -26 -29 18 32 -29 10 21 -29 22 8 -29 6 46 0.85 136 0 0 -29 12 7 17 36 9.7 11 77 -26 -29 16 13 -29 8 2 -29 19 48 -29 4 27 0.86 137 0 0 -29 10 4 17 36 10.7 12 77 -25 -29 14 10 -29 5 59 -29 17 45 -29 2 24 0.86 138 0 0 -29 8 18 17 36 11.8 13 76 -25 -29 12 23 -29 4 13 -29 15 59 -29 0 38 0.86 139 0 0 -29 6 48 17 36 12.9 14 76 -24 -29 10 54 -29 2 44 -29 14 29 -28 59 9 0.87 140 0 0 -29 5 36 17 36 14.2 15 75 -23 -29 9 41 -29 1 31 -29 13 16 -28 57 56 0.87 141 0 0 -29 4 39 17 36 15.4 16 75 -23 -29 8 44 -29 0 34 -29 12 20 -28 56 59 0.87 142 0 0 -29 4 0 17 36 16.8 17 74 -22 -29 8 5 -28 59 55 -29 11 40 -28 56 20 0.87 143 0 0 -29 3 37 17 36 18.2 17 74 -21 -29 7 42 -28 59 32 -29 11 18 -28 55 57 0.87 144 0 0 -29 3 31 17 36 19.7 18 73 -21 -29 7 36 -28 59 26 -29 11 12 -28 55 51 0.87 145 0 0 -29 3 42 17 36 21.3 19 72 -20 -29 7 47 -28 59 37 -29 11 23 -28 56 2 0.88 146 0 0 -29 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2.93 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 270-00471-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 11 23 15.5106 DE: +05 28 32.555 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 11 23 15.5107 DE: +05 28 32.555 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.8 * B mag [mag]: 11.3 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9853) l'Epee asteroid class: approx. diameter [km]: 11 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.25850 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2023 Feb 10 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", 95.32° remarks: * orbital elements for (9853)l'Epee : Mean anomaly = 196.5869822836 deg Arg. of pericenter = 173.1743267379 deg Long. of node = 147.0981554372 deg Inclination = 17.6858463159 deg Eccentricity = 0.1770006712 Semimajor axis = 2.5587301088 AU Perihelion dist = 2.1058331622 AU Mag: H = 13.02, G = 0.15 Epoch of elements : MJD 60631.73542208 TDT (2024 Nov 17.7354) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Feb10,0.42,2024,11,17,17.650128,-0.135480,-0.652138,14.834758,-3.090765,-0.004942,0.002173,-0.000001,0.000000 -150.8887,5.3403,-88.48,-19.22,False TYC 270-00471-1,11.38764181,5.4757101,11.27,10.76,10.48,0.1,4,,11.40885992,5.3403405,8.13,7.96,0,0,0 9853,l'Epee,18.89,11.221,3.2585,0,0,2.682,-8.35,,1.0,0 0,196.4099,2024,11,17,173.1743,147.0982,17.6858,0.17700,2.55873,2.10583,13.02,5.0,0.15 1.439,0.0090,0.0018,95,0.0021,Known errors,0.96,0,-1,-1 20241117_0471-1,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org