IOTA/IOTA-ES occultation update for (431) Nephele / UCAC4 342-162439 event on 2023 May 26, 18:08 UT Visible from New Zealand Summary ------- On 2023 May 26 UT, the 91.5 km diameter asteroid (431) Nephele will occult a 12.1 mag star in the constellation Sagittarius for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.66 mag to 13.49 mag (the magnitude of the asteroid) for at most 16.410 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 May 26, 17:52 - 2023 May 26, 18:25 * geocentric midpoint of event [JD]: 2460091.25628037 * magnitude of target star: 12.09 * magnitude drop [mag]: 1.66 * estimated maximum duration [s]: 16.410 * Moon: 41 % sunlit, 134° distance * Sun: 145° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 106 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 7.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.030, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.004", 87°) * approx speed of asteroid's shadow [km/s]: 5.5749 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 342-162439 by 431 Nephele on 2023 May 26 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 15 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -34 21 53 .. .. .. -34 25 58 .... 16 0 0 -34 15 4 18 25 28.1 1 116 -30 -33 43 33 -34 46 46 -33 39 31 -34 50 51 .... 17 0 0 -34 39 46 18 25 27.5 2 115 -31 -34 8 16 -35 11 27 -34 4 14 -35 15 32 0.50 18 0 0 -35 4 18 18 25 26.7 3 115 -32 -34 32 48 -35 35 58 -34 28 47 -35 40 3 0.52 19 0 0 -35 28 38 18 25 25.5 4 114 -33 -34 57 9 -36 0 17 -34 53 8 -36 4 22 0.53 20 0 0 -35 52 45 18 25 24.0 5 114 -34 -35 21 18 -36 24 24 -35 17 17 -36 28 28 0.53 21 0 0 -36 16 41 18 25 22.2 5 113 -35 -35 45 15 -36 48 18 -35 41 13 -36 52 22 0.54 22 0 0 -36 40 23 18 25 20.0 6 112 -35 -36 8 59 -37 11 59 -36 4 57 -37 16 3 0.54 23 0 0 -37 3 52 18 25 17.6 7 112 -36 -36 32 29 -37 35 27 -36 28 28 -37 39 31 0.54 24 0 0 -37 27 8 18 25 14.9 8 111 -37 -36 55 46 -37 58 40 -36 51 45 -38 2 44 0.54 25 0 0 -37 50 9 18 25 11.9 9 111 -38 -37 18 49 -38 21 40 -37 14 48 -38 25 44 0.55 26 0 0 -38 12 56 18 25 8.6 10 110 -38 -37 41 37 -38 44 25 -37 37 37 -38 48 29 0.55 27 0 0 -38 35 28 18 25 5.0 11 109 -39 -38 4 11 -39 6 56 -38 0 11 -39 10 59 0.55 28 0 0 -38 57 45 18 25 1.2 11 109 -40 -38 26 30 -39 29 11 -38 22 30 -39 33 14 0.55 29 0 0 -39 19 46 18 24 57.1 12 108 -41 -38 48 33 -39 51 10 -38 44 34 -39 55 13 0.55 30 0 0 -39 41 32 18 24 52.8 13 107 -41 -39 10 21 -40 12 54 -39 6 22 -40 16 57 0.55 31 0 0 -40 3 2 18 24 48.2 14 107 -42 -39 31 54 -40 34 22 -39 27 54 -40 38 24 0.55 32 0 0 -40 24 16 18 24 43.4 15 106 -43 -39 53 10 -40 55 34 -39 49 11 -40 59 36 0.55 33 0 0 -40 45 14 18 24 38.4 16 105 -43 -40 14 9 -41 16 29 -40 10 11 -41 20 31 0.55 34 0 0 -41 5 55 18 24 33.2 16 105 -44 -40 34 53 -41 37 8 -40 30 54 -41 41 9 0.55 35 0 0 -41 26 19 18 24 27.7 17 104 -45 -40 55 19 -41 57 30 -40 51 21 -42 1 31 0.55 36 0 0 -41 46 26 18 24 22.1 18 103 -45 -41 15 29 -42 17 34 -41 11 31 -42 21 35 0.56 37 0 0 -42 6 16 18 24 16.2 19 103 -46 -41 35 21 -42 37 22 -41 31 24 -42 41 22 0.56 38 0 0 -42 25 49 18 24 10.1 20 102 -47 -41 54 57 -42 56 52 -41 51 0 -43 0 52 0.56 39 0 0 -42 45 5 18 24 3.9 20 101 -47 -42 14 15 -43 16 5 -42 10 18 -43 20 5 0.56 40 0 0 -43 4 3 18 23 57.5 21 101 -48 -42 33 15 -43 35 0 -42 29 19 -43 39 0 0.56 41 0 0 -43 22 43 18 23 50.9 22 100 -48 -42 51 58 -43 53 38 -42 48 2 -43 57 37 0.56 42 0 0 -43 41 5 18 23 44.1 23 99 -49 -43 10 23 -44 11 58 -43 6 28 -44 15 56 0.56 43 0 0 -43 59 10 18 23 37.2 23 98 -50 -43 28 31 -44 30 0 -43 24 35 -44 33 58 0.56 44 0 0 -44 16 57 18 23 30.1 24 98 -50 -43 46 21 -44 47 44 -43 42 25 -44 51 42 0.56 45 0 0 -44 34 26 18 23 22.9 25 97 -51 -44 3 52 -45 5 10 -43 59 57 -45 9 7 0.56 46 0 0 -44 51 37 18 23 15.5 25 96 -51 -44 21 6 -45 22 18 -44 17 12 -45 26 15 0.56 47 0 0 -45 8 30 18 23 8.0 26 95 -52 -44 38 2 -45 39 8 -44 34 8 -45 43 5 0.56 48 0 0 -45 25 4 18 23 0.4 27 94 -52 -44 54 39 -45 55 40 -44 50 46 -45 59 36 0.56 49 0 0 -45 41 21 18 22 52.6 28 94 -53 -45 10 59 -46 11 53 -45 7 5 -46 15 49 0.56 50 0 0 -45 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52.8 19 256 11 -30 17 13 -31 20 6 -30 13 13 -31 24 9 0.57 -151 0 0 -30 23 39 17 53 45.8 19 255 11 -29 52 19 -30 55 10 -29 48 18 -30 59 14 0.58 -150 0 0 -29 58 40 17 53 39.0 18 255 12 -29 27 20 -30 30 10 -29 23 20 -30 34 13 0.58 -149 0 0 -29 33 36 17 53 32.5 17 254 13 -29 2 18 -30 5 6 -28 58 17 -30 9 9 0.58 -148 0 0 -29 8 30 17 53 26.4 16 254 14 -28 37 12 -29 39 59 -28 33 12 -29 44 2 0.58 -147 0 0 -28 43 21 17 53 20.5 15 253 15 -28 12 4 -29 14 48 -28 8 4 -29 18 52 0.58 -146 0 0 -28 18 10 17 53 15.0 14 252 16 -27 46 55 -28 49 36 -27 42 54 -28 53 39 0.58 -145 0 0 -27 52 58 17 53 9.8 13 252 17 -27 21 43 -28 24 23 -27 17 43 -28 28 26 0.58 -144 0 0 -27 27 44 17 53 5.0 12 252 18 -26 56 31 -27 59 8 -26 52 32 -28 3 11 0.59 -143 0 0 -27 2 31 17 53 0.5 11 251 19 -26 31 20 -27 33 53 -26 27 20 -27 37 56 0.59 -142 0 0 -26 37 18 17 52 56.4 10 251 20 -26 6 8 -27 8 39 -26 2 9 -27 12 41 0.59 -141 0 0 -26 12 7 17 52 52.6 9 250 21 -25 40 58 -26 43 26 -25 36 59 -26 47 28 0.60 -140 0 0 -25 46 57 17 52 49.2 8 250 22 -25 15 50 -26 18 15 -25 11 51 -26 22 16 0.60 -139 0 0 -25 21 50 17 52 46.1 7 249 23 -24 50 45 -25 53 5 -24 46 46 -25 57 7 0.61 -138 0 0 -24 56 46 17 52 43.5 6 249 24 -24 25 42 -25 27 59 -24 21 44 -25 32 1 0.62 -137 0 0 -24 31 45 17 52 41.2 5 248 25 -24 0 44 -25 2 57 -23 56 46 -25 6 58 0.64 -136 0 0 -24 6 50 17 52 39.3 4 248 26 -23 35 50 -24 37 59 -23 31 52 -24 42 0 0.66 -135 0 0 -23 41 59 17 52 37.8 3 248 27 -23 11 1 -24 13 6 -23 7 4 -24 17 7 0.69 -134 0 0 -23 17 14 17 52 36.7 2 247 28 -22 46 19 -23 48 19 -22 42 21 -23 52 20 0.75 -133 0 0 -22 52 36 17 52 36.0 1 247 29 -22 21 43 -23 23 39 -22 17 45 -23 27 39 0.93 -132 0 0 -22 28 5 17 52 35.7 0 246 29 .. .. .. -22 59 5 .. .. .. -23 3 5 3.68 Uncertainty in time = +/- 8 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 342-162439 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 42 15.1109 DE: -21 47 19.699 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 42 15.1109 DE: -21 47 19.699 * 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: (431) Nephele asteroid class: approx. diameter [km]: 92 approx. diameter ["]: 0.064 distance from Earth [AU]: 1.96240 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#75 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): 0.030", 0.004", 87.374° remarks: * orbital elements for (431)Nephele : Mean anomaly = 310.4822749966 deg Arg. of pericenter = 217.3954748249 deg Long. of node = 117.1825142767 deg Inclination = 1.8279218695 deg Eccentricity = 0.1705861454 Semimajor axis = 3.1381412412 AU Perihelion dist = 2.6028178233 AU Mag: H = 9.02, G = 0.15 Epoch of elements : MJD 60090.75618056 TDT (2023 May 26.7562) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#752023Apr24,16.41,2023,5,26,18.150729,0.055253,-0.502276,-3.127750,-0.344099,-0.003168,-0.000346,0.000001,0.000000 124.6019,-21.7665,-92.99,21.18,False UCAC4 342-162439,18.70419745,-21.7888052,0.00,12.09,0.00,0.0,0,,18.72773669,-21.7664803,1.67,0.00,0,0,0 431,Nephele,13.49,91.5,1.9624,0,0,-1.006,-1.54,,4.6,0 0,310.3482,2023,5,26,217.3955,117.1825,1.8279,0.17059,3.13814,2.60282,9.04,5.0,0.15 1.064,0.0300,0.0037,87,0.0041,Known errors,-1.00,-1,-1,-1 20230526_162439,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org