IOTA/IOTA-ES occultation update for (20) Massalia / UCAC4 339-099115 event on 2023 Jun 15, 15:20 UT Visible from New Zealand, Australia Summary ------- On 2023 Jun 15 UT, the 138.3 km diameter asteroid (20) Massalia will occult a 12.2 mag star in the constellation Ophiuchus 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 0.14 mag to 10.04 mag (the magnitude of the asteroid) for at most 11.000 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 15, 15:12 - 2023 Jun 15, 15:28 * geocentric midpoint of event [JD]: 2460111.13909817 * magnitude of target star: 12.23 * magnitude drop [mag]: 0.14 * estimated maximum duration [s]: 11.000 * Moon: 7 % sunlit, 148° distance * Sun: 179° distance * rough path description: New Zealand, Australia Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 148 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.012", 92°) * approx speed of asteroid's shadow [km/s]: 12.5672 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 339-099115 by 20 Massalia on 2023 Jun 15 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 32 0 0 -17 18 17 15 28 11.3 0 113 -1 .. .. .. -18 2 3 .. .. .. -18 11 47 .... 33 0 0 -17 43 24 15 28 11.2 1 113 -2 -16 59 50 -18 27 11 -16 50 12 -18 36 56 0.34 34 0 0 -18 8 33 15 28 10.9 2 113 -3 -17 24 58 -18 52 22 -17 15 20 -19 2 7 0.35 35 0 0 -18 33 44 15 28 10.4 3 113 -4 -17 50 8 -19 17 35 -17 40 29 -19 27 20 0.36 36 0 0 -18 58 57 15 28 9.7 4 112 -6 -18 15 19 -19 42 48 -18 5 40 -19 52 34 0.36 37 0 0 -19 24 10 15 28 8.9 5 112 -7 -18 40 31 -20 8 2 -18 30 52 -20 17 48 0.36 38 0 0 -19 49 22 15 28 7.9 6 112 -8 -19 5 42 -20 33 16 -18 56 3 -20 43 2 0.37 39 0 0 -20 14 34 15 28 6.7 7 111 -9 -19 30 54 -20 58 29 -19 21 14 -21 8 15 0.37 40 0 0 -20 39 45 15 28 5.4 8 111 -10 -19 56 3 -21 23 40 -19 46 24 -21 33 26 0.37 41 0 0 -21 4 54 15 28 3.9 9 110 -11 -20 21 11 -21 48 49 -20 11 32 -21 58 36 0.37 42 0 0 -21 29 59 15 28 2.2 10 110 -12 -20 46 17 -22 13 56 -20 36 37 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0 -25 30 27 15 12 31.2 9 249 -8 -24 46 46 -26 14 22 -24 37 7 -26 24 8 0.41 -135 0 0 -25 6 7 15 12 29.8 8 249 -7 -24 22 24 -25 50 2 -24 12 45 -25 59 49 0.42 -134 0 0 -24 41 37 15 12 28.7 7 248 -6 -23 57 54 -25 25 34 -23 48 15 -25 35 21 0.42 -133 0 0 -24 17 0 15 12 27.6 6 248 -5 -23 33 17 -25 0 58 -23 23 37 -25 10 45 0.43 -132 0 0 -23 52 16 15 12 26.8 5 248 -4 -23 8 32 -24 36 14 -22 58 51 -24 46 1 0.45 -131 0 0 -23 27 25 15 12 26.1 4 247 -3 -22 43 40 -24 11 24 -22 34 0 -24 21 11 0.47 -130 0 0 -23 2 28 15 12 25.6 3 247 -2 -22 18 42 -23 46 27 -22 9 2 -23 56 14 0.50 -129 0 0 -22 37 25 15 12 25.2 2 246 -1 -21 53 39 -23 21 24 -21 43 59 -23 31 12 0.58 -128 0 0 -22 12 17 15 12 25.0 1 246 0 -21 28 31 -22 56 17 -21 18 51 -23 6 4 0.93 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 339-099115 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 38 00.6366 DE: -22 22 46.055 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 38 00.6366 DE: -22 22 46.055 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (20) Massalia asteroid class: ShapeModel approx. diameter [km]: 138 approx. diameter ["]: 0.111 distance from Earth [AU]: 1.71350 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#125 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", 0.012", 91.83° remarks: * orbital elements for (20)Massalia : Mean anomaly = 155.1896280253 deg Arg. of pericenter = 257.4898818574 deg Long. of node = 205.9720910470 deg Inclination = 0.7092436195 deg Eccentricity = 0.1433684285 Semimajor axis = 2.4084007415 AU Perihelion dist = 2.0631121120 AU Mag: H = 6.61, G = 0.25 Epoch of elements : MJD 60110.63909722 TDT (2023 Jun 15.6391) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1252023Apr24,11.00,2023,6,15,15.338356,-0.016086,-0.360186,-7.086218,0.316459,-0.000113,-0.000091,0.000001,0.000000 131.1338,-22.3937,-49.95,23.32,False UCAC4 339-099115,17.63351017,-22.3794597,0.00,12.23,0.00,0.0,0,,17.65732739,-22.3936780,0.14,0.00,0,0,0 20,Massalia,10.04,138.3,1.7135,0,0,-2.622,1.63,,7.2,0 0,155.0211,2023,6,15,257.4899,205.9721,0.7092,0.14337,2.40840,2.06311,6.59,5.0,0.15 1.111,0.0257,0.0123,92,0.0123,Known errors,-1.00,-1,-1,-1 20230615_099115,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org