IOTA/IOTA-ES occultation update for (16) Psyche / UCAC4-380-070440 event on 2023 Apr 27, 16:36 UT Visible from New Zealand, Australia Summary ------- On 2023 Apr 27 UT, the 248.7 km diameter asteroid (16) Psyche will occult a 12.4 mag star in the constellation Libra 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 0.22 mag to 10.82 mag (the magnitude of the asteroid) for at most 19.240 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: 100 * date and approx. time of event: 2023 Apr 27, 16:28 - 2023 Apr 27, 16:44 * geocentric midpoint of event [JD]: 2460062.19188575 * magnitude of target star: 12.42 * magnitude drop [mag]: 0.22 * estimated maximum duration [s]: 19.240 * Moon: 48 % sunlit, 106° distance * Sun: 164° distance * rough path description: New Zealand, Australia Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 266 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.031, +/- 0.020) * 1 sigma uncertainty ellipse (major, minor, PA): (0.032", 0.019", 104°) * approx speed of asteroid's shadow [km/s]: 12.9236 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-380-070440 by 16 Psyche on 2023 Apr 27 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 34 0 0 - 3 9 35 16 43 59.5 0 104 -16 .. .. .. - 4 24 14 .. .. .. - 4 43 33 .... 35 0 0 - 3 25 4 16 43 59.4 1 104 -17 - 2 10 57 - 4 39 49 - 1 51 58 - 4 59 10 0.29 36 0 0 - 3 40 55 16 43 59.1 2 104 -18 - 2 26 42 - 4 55 46 - 2 7 40 - 5 15 9 0.33 37 0 0 - 3 57 7 16 43 58.7 3 104 -19 - 2 42 47 - 5 12 5 - 2 23 44 - 5 31 29 0.34 38 0 0 - 4 13 40 16 43 58.1 4 104 -20 - 2 59 14 - 5 28 44 - 2 40 10 - 5 48 11 0.35 39 0 0 - 4 30 34 16 43 57.3 5 104 -21 - 3 16 2 - 5 45 45 - 2 56 55 - 6 5 13 0.36 40 0 0 - 4 47 49 16 43 56.3 6 104 -22 - 3 33 9 - 6 3 6 - 3 14 2 - 6 22 36 0.36 41 0 0 - 5 5 23 16 43 55.2 7 104 -23 - 3 50 37 - 6 20 47 - 3 31 28 - 6 40 19 0.36 42 0 0 - 5 23 17 16 43 53.9 8 104 -24 - 4 8 25 - 6 38 48 - 3 49 14 - 6 58 21 0.36 43 0 0 - 5 41 31 16 43 52.4 9 103 -25 - 4 26 32 - 6 57 8 - 4 7 19 - 7 16 44 0.36 44 0 0 - 6 0 4 16 43 50.8 10 103 -26 - 4 44 58 - 7 15 48 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11 11 -39 41 23 -36 52 1 -40 0 55 0.46 -133 0 0 -38 11 29 16 28 38.8 2 254 10 -36 56 35 -39 27 2 -36 37 24 -39 46 36 0.49 -132 0 0 -37 56 42 16 28 38.6 1 253 11 -36 41 40 -39 12 22 -36 22 27 -39 31 58 0.57 -131 0 0 -37 41 34 16 28 38.4 1 252 12 -36 26 26 -38 57 22 -36 7 10 -39 17 0 0.86 Uncertainty in time = +/- 4 secs Prediction of 2022 Jun 15.2 Data for the target star ------------------------ * name: UCAC4-380-070440 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 23 08.0941 DE: -14 05 56.762 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 23 08.0942 DE: -14 05 56.762 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (16) Psyche asteroid class: ShapeModel approx. diameter [km]: 249 approx. diameter ["]: 0.151 distance from Earth [AU]: 2.27710 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#91 date of fit: 2022 Feb 03 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): 0.032", 0.019", 104.4° remarks: * orbital elements for (16)Psyche : Mean anomaly = 215.9553152677 deg Arg. of pericenter = 229.3491933201 deg Long. of node = 150.0292356703 deg Inclination = 3.0968195777 deg Eccentricity = 0.1341257366 Semimajor axis = 2.9240672270 AU Perihelion dist = 2.5318745562 AU Mag: H = 6.14, G = 0.20 Epoch of elements : MJD 60061.69173611 TDT (2023 Apr 27.6917) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#912022Feb03,19.24,2023,4,27,16.605258,-0.109509,-0.340456,-6.947570,2.222732,-0.001544,-0.000038,0.000001,0.000000 126.6255,-14.1833,-69.66,13.91,False UCAC4-380-070440,15.38558171,-14.0991006,0.00,12.42,0.00,0.0,0,,15.40733987,-14.1833139,0.22,0.00,0,0,0 16,Psyche,10.82,248.7,2.2771,0,0,-1.845,8.58,,14.0 0,215.8190,2023,4,27,229.3492,150.0292,3.0968,0.13413,2.92407,2.53187,6.06,5.0,0.15 1.129,0.0320,0.0193,104,0.0194,Known errors,-1.00,-1,-1,-1 20230427_070440,59745.16 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 15, 03:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org