IOTA/IOTA-ES occultation update for (94) Aurora / UCAC4 297-170931 event on 2023 Mar 08, 08:18 UT Visible from South America Summary ------- On 2023 Mar 08 UT, the 185.6 km diameter asteroid (94) Aurora will occult a 11.7 mag star in the constellation Sagittarius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.50 mag to 14.05 mag (the magnitude of the asteroid) for at most 7.830 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: 2023 Mar 08, 08:14 - 2023 Mar 08, 08:22 * geocentric midpoint of event [JD]: 2460011.84627617 * magnitude of target star: 11.66 * magnitude drop [mag]: 2.50 * estimated maximum duration [s]: 7.830 * Moon: 99 % sunlit, 98° distance * Sun: 74° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 203 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.012", 88°) * approx speed of asteroid's shadow [km/s]: 23.6997 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 297-170931 by 94 Aurora on 2023 Mar 8 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 - 89 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 25 43 19 .. .. .. .... - 88 0 0 26 34 44 8 14 32.3 0 125 -52 25 28 13 .. .. .. 25 5 44 .. .. .. .... - 87 0 0 25 56 57 8 14 32.3 1 125 -51 24 50 28 27 4 7 24 27 59 27 27 9 -0.11 - 86 0 0 25 19 2 8 14 32.5 2 126 -51 24 12 35 26 26 10 23 50 6 26 49 11 -0.25 - 85 0 0 24 40 59 8 14 32.8 4 126 -50 23 34 34 25 48 4 23 12 6 26 11 5 -0.31 - 84 0 0 24 2 49 8 14 33.2 5 127 -50 22 56 28 25 9 52 22 34 1 25 32 51 -0.34 - 83 0 0 23 24 35 8 14 33.7 6 127 -49 22 18 17 24 31 33 21 55 51 24 54 31 -0.36 - 82 0 0 22 46 17 8 14 34.3 7 128 -48 21 40 3 23 53 11 21 17 39 24 16 7 -0.37 - 81 0 0 22 7 56 8 14 35.1 8 128 -48 21 1 47 23 14 45 20 39 25 23 37 40 -0.38 - 80 0 0 21 29 35 8 14 36.0 9 128 -47 20 23 31 22 36 18 20 1 10 22 59 11 -0.38 - 79 0 0 20 51 14 8 14 36.9 10 129 -46 19 45 16 21 57 51 19 22 57 22 20 42 -0.39 - 78 0 0 20 12 54 8 14 38.0 11 129 -46 19 7 3 21 19 26 18 44 46 21 42 14 -0.39 - 77 0 0 19 34 38 8 14 39.2 13 129 -45 18 28 53 20 41 3 18 6 39 21 3 48 -0.40 - 76 0 0 18 56 27 8 14 40.6 14 130 -44 17 50 49 20 2 43 17 28 37 20 25 27 -0.40 - 75 0 0 18 18 21 8 14 42.0 15 130 -43 17 12 51 19 24 30 16 50 41 19 47 10 -0.40 - 74 0 0 17 40 22 8 14 43.6 16 130 -42 16 35 0 18 46 23 16 12 54 19 9 1 -0.41 - 73 0 0 17 2 33 8 14 45.2 17 131 -42 15 57 19 18 8 24 15 35 15 18 30 59 -0.41 - 72 0 0 16 24 53 8 14 47.0 18 131 -41 15 19 48 17 30 35 14 57 47 17 53 7 -0.41 - 71 0 0 15 47 24 8 14 48.9 19 131 -40 14 42 29 16 52 57 14 20 31 17 15 25 -0.41 - 70 0 0 15 10 8 8 14 50.9 21 132 -39 14 5 22 16 15 31 13 43 28 16 37 55 -0.41 - 69 0 0 14 33 5 8 14 53.1 22 132 -38 13 28 30 15 38 18 13 6 39 16 0 39 -0.41 - 68 0 0 13 56 18 8 14 55.3 23 132 -37 12 51 53 15 1 20 12 30 5 15 23 37 -0.41 - 67 0 0 13 19 47 8 14 57.6 24 133 -36 12 15 33 14 24 38 11 53 48 14 46 51 -0.42 - 66 0 0 12 43 33 8 15 0.1 25 133 -35 11 39 30 13 48 13 11 17 49 14 10 22 -0.42 - 65 0 0 12 7 38 8 15 2.6 26 133 -34 11 3 46 13 12 6 10 42 9 13 34 12 -0.42 - 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Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 297-170931 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 13 49.4858 DE: -30 47 23.822 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 13 49.4858 DE: -30 47 23.822 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (94) Aurora asteroid class: approx. diameter [km]: 186 approx. diameter ["]: 0.072 distance from Earth [AU]: 3.57890 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#117 date of fit: 2023 Feb 09 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): 0.017", 0.012", 88.185° remarks: * orbital elements for (94)Aurora : Mean anomaly = 197.0135738361 deg Arg. of pericenter = 60.2056830055 deg Long. of node = 2.5505887490 deg Inclination = 7.9708691973 deg Eccentricity = 0.0952788935 Semimajor axis = 3.1559951031 AU Perihelion dist = 2.8552953818 AU Mag: H = 7.69, G = 0.15 Epoch of elements : MJD 60011.34631944 TDT (2023 Mar 08.3463) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1172023Feb09,7.83,2023,3,8,8.310628,0.053231,0.401198,13.262410,-1.745588,-0.005706,-0.000363,0.000000,0.000000 -16.6173,-30.7834,58.06,-4.94,False UCAC4 297-170931,18.23041270,-30.7899506,0.00,11.66,0.00,0.0,0,,18.25500437,-30.7833688,2.50,0.00,0,0,0 94,Aurora,14.05,185.6,3.5789,0,0,2.529,-4.29,,10.4,0 0,196.9527,2023,3,8,60.2057,2.5506,7.9709,0.09528,3.15600,2.85530,7.72,5.0,0.15 1.170,0.0173,0.0120,88,0.0122,Known errors,-1.00,-1,-1,-1 20230308_170931,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org