IOTA/IOTA-ES occultation update for (94) Aurora / UCAC4 296-185474 event on 2023 Mar 14, 08:27 UT Visible from South America Summary ------- On 2023 Mar 14 UT, the 185.6 km diameter asteroid (94) Aurora will occult a 12.4 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 1.79 mag to 14.00 mag (the magnitude of the asteroid) for at most 8.690 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 14, 08:22 - 2023 Mar 14, 08:32 * geocentric midpoint of event [JD]: 2460017.85241750 * magnitude of target star: 12.44 * magnitude drop [mag]: 1.79 * estimated maximum duration [s]: 8.690 * Moon: 59 % sunlit, 21° distance * Sun: 79° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 187 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.012", 87°) * approx speed of asteroid's shadow [km/s]: 21.3607 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 296-185474 by 94 Aurora on 2023 Mar 14 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 -111 0 0 1 24 17 8 22 32.1 0 121 -78 0 25 1 .. .. .. 0 4 39 .. .. .. .... -110 0 0 0 47 53 8 22 32.2 1 121 -77 - 0 11 30 1 47 7 - 0 31 54 2 7 24 0.20 -109 0 0 0 11 15 8 22 32.4 3 121 -75 - 0 48 14 1 10 35 - 1 8 40 1 30 54 0.16 -108 0 0 - 0 25 36 8 22 32.8 4 121 -74 - 1 25 10 0 33 50 - 1 45 38 0 54 10 0.15 -107 0 0 - 1 2 39 8 22 33.2 5 121 -73 - 2 2 19 - 0 3 8 - 2 22 49 0 17 14 0.15 -106 0 0 - 1 39 53 8 22 33.8 6 121 -72 - 2 39 38 - 0 40 18 - 3 0 9 - 0 19 54 0.14 -105 0 0 - 2 17 17 8 22 34.5 7 121 -71 - 3 17 6 - 1 17 37 - 3 37 39 - 0 57 11 0.14 -104 0 0 - 2 54 49 8 22 35.4 8 121 -70 - 3 54 42 - 1 55 5 - 4 15 17 - 1 34 38 0.14 -103 0 0 - 3 32 29 8 22 36.3 10 121 -69 - 4 32 25 - 2 32 42 - 4 53 1 - 2 12 13 0.14 -102 0 0 - 4 10 15 8 22 37.4 11 121 -68 - 5 10 14 - 3 10 24 - 5 30 51 - 2 49 55 0.13 -101 0 0 - 4 48 5 8 22 38.6 12 121 -67 - 5 48 8 - 3 48 12 - 6 8 45 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2 -19 54 21 -22 11 6 -19 34 24 0.14 60 0 0 -20 20 17 8 32 15.4 15 242 71 -21 18 50 -19 21 52 -21 38 56 -19 1 52 0.14 61 0 0 -19 47 33 8 32 16.8 14 242 72 -20 46 13 -18 49 0 -21 6 22 -18 28 58 0.14 62 0 0 -19 14 25 8 32 18.1 13 241 72 -20 13 13 -18 15 46 -20 33 25 -17 55 40 0.14 63 0 0 -18 40 55 8 32 19.3 11 241 72 -19 39 50 -17 42 9 -20 0 5 -17 22 1 0.14 64 0 0 -18 7 4 8 32 20.4 10 241 72 -19 6 6 -17 8 11 -19 26 22 -16 48 1 0.15 65 0 0 -17 32 52 8 32 21.4 9 240 72 -18 32 0 -16 33 52 -18 52 19 -16 13 40 0.15 66 0 0 -16 58 20 8 32 22.3 8 240 72 -17 57 34 -15 59 14 -18 17 55 -15 39 0 0.15 67 0 0 -16 23 29 8 32 23.1 7 240 71 -17 22 49 -15 24 17 -17 43 12 -15 4 1 0.16 68 0 0 -15 48 20 8 32 23.8 6 239 71 -16 47 45 -14 49 3 -17 8 10 -14 28 45 0.17 69 0 0 -15 12 53 8 32 24.4 5 239 71 -16 12 24 -14 13 32 -16 32 50 -13 53 12 0.18 70 0 0 -14 37 11 8 32 24.8 4 239 70 -15 36 46 -13 37 45 -15 57 14 -13 17 24 0.19 71 0 0 -14 1 14 8 32 25.1 3 239 70 -15 0 53 -13 1 44 -15 21 22 -12 41 21 0.22 72 0 0 -13 25 2 8 32 25.3 1 238 69 -14 24 45 -12 25 28 -14 45 16 -12 5 5 0.31 73 0 0 -12 48 38 8 32 25.4 0 238 69 -13 48 24 .. .. .. -14 8 56 .. .. .. 1.26 Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 296-185474 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 19 40.2429 DE: -30 57 56.020 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 19 40.2429 DE: -30 57 56.020 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (94) Aurora asteroid class: approx. diameter [km]: 186 approx. diameter ["]: 0.073 distance from Earth [AU]: 3.49250 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): 0.018", 0.012", 87.343° remarks: * orbital elements for (94)Aurora : Mean anomaly = 198.0671164411 deg Arg. of pericenter = 60.2079865511 deg Long. of node = 2.5503925106 deg Inclination = 7.9708618016 deg Eccentricity = 0.0952859356 Semimajor axis = 3.1559726125 AU Perihelion dist = 2.8552528094 AU Mag: H = 7.69, G = 0.15 Epoch of elements : MJD 60017.35243056 TDT (2023 Mar 14.3524) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1172023Feb09,8.69,2023,3,14,8.458020,-0.015980,-0.112206,11.932003,-1.728526,-0.005818,-0.000368,0.000000,0.000000 -23.2855,-30.9556,55.45,-2.58,False UCAC4 296-185474,18.32784522,-30.9655610,0.00,12.44,0.00,0.0,0,,18.35250793,-30.9556414,1.80,0.00,0,0,0 94,Aurora,14.00,185.6,3.4925,0,0,2.337,-4.35,,10.4,0 0,198.0052,2023,3,14,60.2080,2.5504,7.9709,0.09529,3.15597,2.85525,7.72,5.0,0.15 1.171,0.0177,0.0123,87,0.0126,Known errors,-1.00,-1,-1,-1 20230314_185474,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org