IOTA/IOTA-ES occultation update for (419) Aurelia / UCAC4 337-108392 event on 2021 Mar 30, 14:39 UT Visible from NE Australia Summary ------- On 2021 Mar 30 UT, the 132.6 km diameter asteroid (419) Aurelia will occult a 11.7 mag star in the constellation Sagittarius for observers along a path across NE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.16 mag to 12.35 mag (the magnitude of the asteroid) for at most 8.7 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: 2021 Mar 30, 14:32 - 2021 Mar 30, 14:46 * geocentric midpoint of event [JD]: 2459304.11099583 * magnitude of target star: 11.65 * magnitude drop [mag]: 1.16 * estimated maximum duration [s]: 8.7 * Moon: 95 % sunlit, 51° distance * Sun: 103° distance * rough path description: NE Australia The occultation path -------------------- * approximate projected width [km]: 135 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.031, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.031", 0.006", 87°) * approx speed of asteroid's shadow [km/s]: 15.2316 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 337-108392 by 419 Aurelia on 2021 Mar 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 124 0 0 -15 10 7 14 32 59.7 0 113 -68 -15 50 10 .. .. .. -15 54 9 .. .. .. .... 125 0 0 -15 35 21 14 32 59.8 1 113 -69 -16 15 23 -14 55 25 -16 19 22 -14 51 28 0.23 126 0 0 -16 0 28 14 33 0.1 2 113 -70 -16 40 29 -15 20 34 -16 44 28 -15 16 36 0.22 127 0 0 -16 25 28 14 33 0.4 3 113 -70 -17 5 28 -15 45 34 -17 9 26 -15 41 37 0.21 128 0 0 -16 50 19 14 33 1.0 4 112 -71 -17 30 17 -16 10 27 -17 34 16 -16 6 30 0.21 129 0 0 -17 15 1 14 33 1.7 5 112 -71 -17 54 58 -16 35 11 -17 58 56 -16 31 14 0.21 130 0 0 -17 39 34 14 33 2.5 7 112 -71 -18 19 29 -16 59 45 -18 23 27 -16 55 49 0.21 131 0 0 -18 3 57 14 33 3.4 8 111 -72 -18 43 50 -17 24 10 -18 47 48 -17 20 14 0.21 132 0 0 -18 28 10 14 33 4.5 9 111 -72 -19 8 1 -17 48 25 -19 11 59 -17 44 28 0.21 133 0 0 -18 52 11 14 33 5.7 10 111 -72 -19 32 0 -18 12 28 -19 35 58 -18 8 32 0.21 134 0 0 -19 16 1 14 33 7.1 11 110 -73 -19 55 48 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250 57 -13 19 16 -11 58 59 -13 23 16 -11 55 0 0.21 - 68 0 0 -12 12 56 14 46 20.9 18 250 58 -12 53 8 -11 32 50 -12 57 7 -11 28 52 0.22 - 67 0 0 -11 46 45 14 46 23.4 17 250 59 -12 26 57 -11 6 40 -12 30 57 -11 2 41 0.22 - 66 0 0 -11 20 33 14 46 25.6 16 249 60 -12 0 44 -10 40 28 -12 4 44 -10 36 30 0.22 - 65 0 0 -10 54 20 14 46 27.8 15 249 61 -11 34 31 -10 14 16 -11 38 31 -10 10 17 0.22 - 64 0 0 -10 28 7 14 46 29.8 14 249 63 -11 8 18 - 9 48 3 -11 12 17 - 9 44 5 0.22 - 63 0 0 -10 1 55 14 46 31.7 13 249 64 -10 42 4 - 9 21 51 -10 46 4 - 9 17 53 0.22 - 62 0 0 - 9 35 43 14 46 33.4 12 249 65 -10 15 52 - 8 55 41 -10 19 52 - 8 51 43 0.22 - 61 0 0 - 9 9 34 14 46 34.9 11 249 66 - 9 49 42 - 8 29 32 - 9 53 41 - 8 25 34 0.23 - 60 0 0 - 8 43 27 14 46 36.3 10 248 67 - 9 23 34 - 8 3 27 - 9 27 33 - 7 59 29 0.23 - 59 0 0 - 8 17 24 14 46 37.6 8 248 68 - 8 57 29 - 7 37 25 - 9 1 28 - 7 33 27 0.23 - 58 0 0 - 7 51 24 14 46 38.7 7 248 69 - 8 31 28 - 7 11 27 - 8 35 27 - 7 7 29 0.24 - 57 0 0 - 7 25 29 14 46 39.7 6 248 70 - 8 5 32 - 6 45 33 - 8 9 31 - 6 41 36 0.24 - 56 0 0 - 6 59 40 14 46 40.5 5 248 71 - 7 39 40 - 6 19 45 - 7 43 39 - 6 15 48 0.25 - 55 0 0 - 6 33 56 14 46 41.1 4 248 72 - 7 13 55 - 5 54 3 - 7 17 53 - 5 50 6 0.26 - 54 0 0 - 6 8 19 14 46 41.6 3 248 73 - 6 48 16 - 5 28 28 - 6 52 14 - 5 24 31 0.29 - 53 0 0 - 5 42 49 14 46 42.0 2 247 74 - 6 22 43 - 5 3 0 - 6 26 42 - 4 59 3 0.33 - 52 0 0 - 5 17 26 14 46 42.2 1 247 75 - 5 57 19 - 4 37 40 - 6 1 17 - 4 33 43 0.49 Uncertainty in time = +/- 2 secs Prediction of 2021 Mar 17.0 Data for the target star ------------------------ * name: UCAC4 337-108392 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 45 13.2367 DE: -22 36 47.318 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 45 13.2367 DE: -22 36 47.318 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (419) Aurelia asteroid class: approx. diameter [km]: 133 approx. diameter ["]: 0.118 distance from Earth [AU]: 1.54410 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#109 date of fit: 2021 Mar 16 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): 0.031", 0.006", 87.453° remarks: * orbital elements for (419)Aurelia : Mean anomaly = 338.66142993 deg Arg. of pericenter = 44.62001142 deg Long. of node = 229.10423492 deg Inclination = 3.92640811 deg Eccentricity = 0.25090139 Semimajor axis = 2.59631995 AU Perihelion dist = 1.94489967 AU Mag: H = 8.61, G = 0.15 Epoch of elements : MJD 59303.61104167 TDT (2021 Mar 30.6110) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1092021Mar16,8.71,2021,3,30,14.6639,0.01568,-0.18666,8.55811,0.81817,-0.00514,0.00010,0.00000,0.00000 -141.5393,-22.6213,-38.86,4.01,False UCAC4 337-108392,17.75367685,-22.6131439,0.00,11.65,0.00,0.0,0,,17.77484518,-22.6213068 419,Aurelia,12.35,132.6,1.5441,0,0,3.520,4.67,,7.4 0,338.5175,2021,3,30,44.6200,229.1042,3.9264,0.25090,2.59632,1.94490,8.61,5.0,0.15 1.050,0.0310,0.0057,87,0.0059,Known errors,-1.00,-1,-1,-1 20210330_108392,59290.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2021 Mar 17, 01:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org