IOTA/IOTA-ES occultation update for (2819) Ensor / HIP 90655 event on 2024 Sep 22, 05:03 UT Visible from Summary ------- On 2024 Sep 22 UT, the 11.3946078170932 km diameter asteroid (2819) Ensor will occult a 8.7 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 8.05 mag to 16.70 mag (the magnitude of the asteroid) for at most 0.850 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: 98 * date and approx. time of event: 2024 Sep 22, 04:57 - 2024 Sep 22, 05:10 * geocentric midpoint of event [JD]: 2460575.71101937 * magnitude of target star: 8.65 * magnitude drop [mag]: 8.05 * estimated maximum duration [s]: 0.850 * Moon: 77 % sunlit, 140° distance * Sun: 97° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 87°) * approx speed of asteroid's shadow [km/s]: 13.6541 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 90655 by 2819 Ensor on 2024 Sep 22 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 87 0 0 -41 6 27 4 57 46.2 0 125 46 -41 11 25 -41 1 30 -41 14 55 -40 58 1 .... 88 0 0 -41 38 48 4 57 46.3 1 125 46 -41 43 46 -41 33 50 -41 47 16 -41 30 20 0.67 89 0 0 -42 10 58 4 57 46.6 2 124 46 -42 15 57 -42 6 1 -42 19 27 -42 2 31 0.74 90 0 0 -42 42 58 4 57 47.0 3 123 46 -42 47 57 -42 38 0 -42 51 28 -42 34 30 0.77 91 0 0 -43 14 46 4 57 47.5 4 123 45 -43 19 45 -43 9 48 -43 23 16 -43 6 18 0.78 92 0 0 -43 46 21 4 57 48.2 5 122 45 -43 51 19 -43 41 22 -43 54 51 -43 37 52 0.79 93 0 0 -44 17 41 4 57 49.1 6 121 45 -44 22 40 -44 12 43 -44 26 11 -44 9 13 0.79 94 0 0 -44 48 47 4 57 50.1 6 121 44 -44 53 46 -44 43 49 -44 57 17 -44 40 18 0.80 95 0 0 -45 19 37 4 57 51.2 7 120 44 -45 24 36 -45 14 39 -45 28 7 -45 11 8 0.80 96 0 0 -45 50 10 4 57 52.4 8 119 44 -45 55 8 -45 45 12 -45 58 40 -45 41 41 0.80 97 0 0 -46 20 25 4 57 53.8 9 118 43 -46 25 24 -46 15 27 -46 28 55 -46 11 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49.9 8 245 -56 -31 31 45 -31 22 11 -31 35 8 -31 18 49 0.89 - 64 0 0 -30 54 27 5 9 51.4 7 244 -56 -30 59 13 -30 49 41 -31 2 36 -30 46 20 0.90 - 63 0 0 -30 22 9 5 9 52.7 6 244 -56 -30 26 55 -30 17 25 -30 30 16 -30 14 4 0.92 - 62 0 0 -29 50 5 5 9 53.7 5 243 -56 -29 54 50 -29 45 22 -29 58 10 -29 42 1 0.93 - 61 0 0 -29 18 17 5 9 54.7 4 243 -56 -29 23 0 -29 13 34 -29 26 20 -29 10 14 0.96 - 60 0 0 -28 46 44 5 9 55.4 3 242 -56 -28 51 26 -28 42 2 -28 54 45 -28 38 43 1.01 - 59 0 0 -28 15 28 5 9 55.9 2 242 -56 -28 20 9 -28 10 47 -28 23 28 -28 7 29 1.10 - 58 0 0 -27 44 30 5 9 56.2 1 241 -56 -27 49 10 -27 39 51 -27 52 28 -27 36 33 1.33 - 57 0 0 -27 13 51 5 9 56.4 0 241 -55 -27 18 30 -27 9 13 -27 21 47 -27 5 56 4.07 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: HIP 90655 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 29 52.1854 DE: -26 01 33.824 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 29 52.1847 DE: -26 01 33.825 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 8.7 * B mag [mag]: 9.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2819) Ensor asteroid class: approx. diameter [km]: 11 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.07360 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.014", 0.002", 87.355° remarks: * orbital elements for (2819)Ensor : Mean anomaly = 317.1563680666 deg Arg. of pericenter = 344.5227824142 deg Long. of node = 18.2378062704 deg Inclination = 2.4298396673 deg Eccentricity = 0.2015036324 Semimajor axis = 2.7594277317 AU Perihelion dist = 2.2033930205 AU Mag: H = 12.07, G = 0.15 Epoch of elements : MJD 60575.21101896 TDT (2024 Sep 22.2110) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,0.85,2024,9,22,5.064465,0.090620,-0.615421,7.628365,1.096556,0.005473,0.000331,0.000000,0.000000 -159.6726,-26.0106,102.19,0.12,False HIP 90655,18.49782932,-26.0260623,8.96,8.65,8.48,0.1,0,,18.52339954,-26.0106203,8.05,7.77,0,0,0 2819,Ensor,16.70,11.545,2.0736,0,0,2.401,4.66,,0.6,0 0,317.1110,2024,9,22,344.5228,18.2378,2.4298,0.20150,2.75943,2.20339,12.07,5.0,0.15 1.353,0.0143,0.0023,87,0.0027,Known errors,0.84,0,-1,-1 20240922__90655,60140.58 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org