IOTA/IOTA-ES occultation update for (94) Aurora / UCAC4 279-190454 event on 2023 Jun 07, 01:23 UT Visible from Africa, South America Summary ------- On 2023 Jun 07 UT, the 185.6 km diameter asteroid (94) Aurora will occult a 12.1 mag star in the constellation Sagittarius for observers along a path across Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.22 mag to 12.85 mag (the magnitude of the asteroid) for at most 15.330 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 Jun 07, 01:15 - 2023 Jun 07, 01:32 * geocentric midpoint of event [JD]: 2460102.55828696 * magnitude of target star: 12.06 * magnitude drop [mag]: 1.22 * estimated maximum duration [s]: 15.330 * Moon: 88 % sunlit, 20° distance * Sun: 157° distance * rough path description: Africa, South America The occultation path -------------------- * approximate projected width [km]: 198 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.016) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.016", 86°) * approx speed of asteroid's shadow [km/s]: 12.1069 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 279-190454 by 94 Aurora on 2023 Jun 7 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 - 85 0 0 7 7 10 1 32 8.5 0 125 -23 .. .. .. 6 1 33 .. .. .. 5 40 47 .... - 84 0 0 6 26 7 1 32 8.3 2 125 -24 7 32 3 5 20 46 7 53 10 5 0 7 -0.12 - 83 0 0 5 45 34 1 32 7.8 3 125 -25 6 51 13 4 40 31 7 12 14 4 19 57 -0.25 - 82 0 0 5 5 33 1 32 7.2 4 125 -26 6 10 54 4 0 48 6 31 49 3 40 19 -0.29 - 81 0 0 4 26 5 1 32 6.2 5 125 -28 5 31 8 3 21 38 5 51 57 3 1 15 -0.32 - 80 0 0 3 47 11 1 32 5.1 6 125 -29 4 51 55 2 43 1 5 12 38 2 22 44 -0.34 - 79 0 0 3 8 52 1 32 3.7 7 125 -30 4 13 17 2 5 0 4 33 54 1 44 47 -0.35 - 78 0 0 2 31 7 1 32 2.1 9 125 -31 3 35 15 1 27 33 3 55 46 1 7 26 -0.35 - 77 0 0 1 53 59 1 32 0.3 10 125 -32 2 57 48 0 50 42 3 18 13 0 30 42 -0.36 - 76 0 0 1 17 27 1 31 58.2 11 125 -33 2 20 58 0 14 29 2 41 17 - 0 5 27 -0.36 - 75 0 0 0 41 33 1 31 55.9 12 125 -35 1 44 45 - 0 21 8 2 4 59 - 0 40 58 -0.37 - 74 0 0 0 6 16 1 31 53.4 13 125 -36 1 9 11 - 0 56 7 1 29 18 - 1 15 52 -0.37 - 73 0 0 - 0 28 23 1 31 50.8 14 125 -37 0 34 14 - 1 30 28 0 54 16 - 1 50 7 -0.37 - 72 0 0 - 1 2 23 1 31 47.9 16 126 -38 - 0 0 4 - 2 4 11 0 19 52 - 2 23 44 -0.37 - 71 0 0 - 1 35 44 1 31 44.8 17 126 -39 - 0 33 42 - 2 37 15 - 0 13 52 - 2 56 43 -0.38 - 70 0 0 - 2 8 25 1 31 41.5 18 126 -40 - 1 6 41 - 3 9 40 - 0 46 57 - 3 29 2 -0.38 - 69 0 0 - 2 40 28 1 31 38.0 19 126 -41 - 1 39 1 - 3 41 25 - 1 19 22 - 4 0 42 -0.38 - 68 0 0 - 3 11 50 1 31 34.4 20 126 -42 - 2 10 40 - 4 12 31 - 1 51 7 - 4 31 43 -0.38 - 67 0 0 - 3 42 32 1 31 30.6 21 126 -44 - 2 41 39 - 4 42 57 - 2 22 11 - 5 2 4 -0.38 - 66 0 0 - 4 12 34 1 31 26.6 22 126 -45 - 3 11 58 - 5 12 43 - 2 52 35 - 5 31 45 -0.38 - 65 0 0 - 4 41 56 1 31 22.4 23 126 -46 - 3 41 36 - 5 41 49 - 3 22 19 - 6 0 46 -0.38 - 64 0 0 - 5 10 38 1 31 18.1 24 126 -47 - 4 10 34 - 6 10 15 - 3 51 22 - 6 29 7 -0.38 - 63 0 0 - 5 38 39 1 31 13.7 25 126 -48 - 4 38 51 - 6 38 0 - 4 19 44 - 6 56 48 -0.38 - 62 0 0 - 6 6 0 1 31 9.0 26 126 -49 - 5 6 27 - 7 5 6 - 4 47 25 - 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Uncertainty in time = +/- 4 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 279-190454 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 30 15.9027 DE: -34 22 00.108 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 30 15.9027 DE: -34 22 00.108 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (94) Aurora asteroid class: approx. diameter [km]: 186 approx. diameter ["]: 0.104 distance from Earth [AU]: 2.46010 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#118 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): 0.026", 0.016", 85.674° remarks: * orbital elements for (94)Aurora : Mean anomaly = 212.9347053789 deg Arg. of pericenter = 60.2334584141 deg Long. of node = 2.5482977976 deg Inclination = 7.9708138716 deg Eccentricity = 0.0953643998 Semimajor axis = 3.1557200600 AU Perihelion dist = 2.8547767106 AU Mag: H = 7.72, G = 0.15 Epoch of elements : MJD 60102.05819445 TDT (2023 Jun 07.0582) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182023Apr24,15.33,2023,6,7,1.398887,-0.073574,0.346798,-6.685187,-1.415837,-0.002071,0.000908,0.000001,0.000000 1.7819,-34.3505,158.71,22.71,False UCAC4 279-190454,18.50441741,-34.3666965,0.00,12.06,0.00,0.0,0,,18.53054939,-34.3505201,1.22,0.00,0,0,0 94,Aurora,12.85,185.6,2.4601,0,0,-1.929,-5.06,,10.4,0 0,212.7487,2023,6,6,60.2335,2.5483,7.9708,0.09536,3.15572,2.85478,7.72,5.0,0.15 1.159,0.0257,0.0163,86,0.0165,Known errors,-1.00,-1,-1,-1 20230607_190454,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org