IOTA/IOTA-ES occultation update for (94) Aurora / UCAC4 277-165195 event on 2023 Jun 30, 10:31 UT Visible from New Zealand, Australia Summary ------- On 2023 Jun 30 UT, the 185.6 km diameter asteroid (94) Aurora will occult a 11.8 mag star in the constellation Sagittarius for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.24 mag to 12.64 mag (the magnitude of the asteroid) for at most 13.550 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 30, 10:23 - 2023 Jun 30, 10:39 * geocentric midpoint of event [JD]: 2460125.93825900 * magnitude of target star: 11.82 * magnitude drop [mag]: 1.24 * estimated maximum duration [s]: 13.550 * Moon: 88 % sunlit, 36° distance * Sun: 167° distance * rough path description: New Zealand, Australia Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 187 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.017) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.017", 89°) * approx speed of asteroid's shadow [km/s]: 13.6988 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 277-165195 by 94 Aurora on 2023 Jun 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 102 0 0 - 4 9 3 10 38 48.6 0 125 7 .. .. .. - 5 10 41 .. .. .. - 5 30 3 .... 103 0 0 - 4 50 59 10 38 48.5 1 125 6 - 3 49 26 - 5 52 38 - 3 30 9 - 6 12 0 0.19 104 0 0 - 5 32 54 10 38 48.2 2 125 4 - 4 31 21 - 6 34 33 - 4 12 3 - 6 53 56 0.14 105 0 0 - 6 14 47 10 38 47.7 4 125 3 - 5 13 14 - 7 16 26 - 4 53 56 - 7 35 49 0.12 106 0 0 - 6 56 36 10 38 46.9 5 124 2 - 5 55 3 - 7 58 15 - 5 35 46 - 8 17 37 0.11 107 0 0 - 7 38 19 10 38 46.0 6 124 1 - 6 36 48 - 8 39 58 - 6 17 31 - 8 59 19 0.11 108 0 0 - 8 19 56 10 38 44.9 7 124 0 - 7 18 27 - 9 21 33 - 6 59 10 - 9 40 54 0.10 109 0 0 - 9 1 25 10 38 43.5 8 124 -1 - 7 59 58 -10 3 0 - 7 40 42 -10 22 21 0.10 110 0 0 - 9 42 45 10 38 42.0 10 124 -3 - 8 41 20 -10 44 17 - 8 22 5 -11 3 36 0.10 111 0 0 -10 23 53 10 38 40.2 11 124 -4 - 9 22 31 -11 25 22 - 9 3 17 -11 44 41 0.10 112 0 0 -11 4 49 10 38 38.3 12 124 -5 -10 3 31 -12 6 14 - 9 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25 - 7 15 42 - 4 53 7 - 7 35 5 0.36 - 67 0 0 .. .. .... .. .. .. .. .. .. .. .. .. - 6 33 44 .. .. .. - 6 53 8 .... Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 277-165195 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 09 35.4533 DE: -34 44 12.318 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 09 35.4533 DE: -34 44 12.318 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (94) Aurora asteroid class: approx. diameter [km]: 186 approx. diameter ["]: 0.106 distance from Earth [AU]: 2.40650 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", 0.017", 89.094° remarks: * orbital elements for (94)Aurora : Mean anomaly = 217.0392949724 deg Arg. of pericenter = 60.2404347237 deg Long. of node = 2.5478816257 deg Inclination = 7.9708134080 deg Eccentricity = 0.0953903993 Semimajor axis = 3.1556393912 AU Perihelion dist = 2.8546216896 AU Mag: H = 7.72, G = 0.15 Epoch of elements : MJD 60125.43819444 TDT (2023 Jun 30.4382) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182023Apr24,13.55,2023,6,30,10.518216,-0.001764,-0.104218,-7.730894,0.131229,0.000599,0.001115,0.000001,0.000000 -163.2176,-34.7329,23.15,23.17,False UCAC4 277-165195,18.15984815,-34.7367548,0.00,11.82,0.00,0.0,0,,18.18622157,-34.7329073,1.24,0.00,0,0,0 94,Aurora,12.64,185.6,2.4065,0,0,-2.291,0.48,,10.4,0 0,216.9623,2023,6,30,60.2404,2.5479,7.9708,0.09539,3.15564,2.85462,7.72,5.0,0.15 1.157,0.0260,0.0167,89,0.0167,Known errors,-1.00,-1,-1,-1 20230630_165195,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org