IOTA/IOTA-ES occultation update for (431) Nephele / UCAC4 340-129526 event on 2023 Mar 18, 15:48 UT Visible from Australia Summary ------- On 2023 Mar 18 UT, the 91.5 km diameter asteroid (431) Nephele will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.86 mag to 14.69 mag (the magnitude of the asteroid) for at most 4.330 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 Mar 18, 15:43 - 2023 Mar 18, 15:53 * geocentric midpoint of event [JD]: 2460022.15870838 * magnitude of target star: 11.91 * magnitude drop [mag]: 2.86 * estimated maximum duration [s]: 4.330 * Moon: 14 % sunlit, 41° distance * Sun: 84° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 95 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.003", 90°) * approx speed of asteroid's shadow [km/s]: 21.1365 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 340-129526 by 431 Nephele on 2023 Mar 18 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 126 0 0 -15 38 37 15 43 40.8 0 113 -74 -16 6 36 .. .. .. -16 10 47 .. .. .. .... 127 0 0 -16 3 17 15 43 40.8 1 113 -73 -16 31 16 -15 35 22 -16 35 27 -15 31 12 0.27 128 0 0 -16 27 54 15 43 41.0 2 112 -73 -16 55 53 -16 0 0 -17 0 4 -15 55 49 0.27 129 0 0 -16 52 29 15 43 41.3 3 112 -72 -17 20 27 -16 24 34 -17 24 39 -16 20 24 0.27 130 0 0 -17 16 59 15 43 41.7 4 112 -71 -17 44 57 -16 49 5 -17 49 9 -16 44 55 0.27 131 0 0 -17 41 26 15 43 42.2 5 112 -71 -18 9 24 -17 13 31 -18 13 35 -17 9 21 0.27 132 0 0 -18 5 47 15 43 42.7 6 111 -70 -18 33 45 -17 37 53 -18 37 56 -17 33 43 0.27 133 0 0 -18 30 3 15 43 43.4 7 111 -70 -18 58 1 -18 2 10 -19 2 12 -17 58 0 0.27 134 0 0 -18 54 14 15 43 44.2 8 111 -69 -19 22 10 -18 26 21 -19 26 21 -18 22 11 0.27 135 0 0 -19 18 17 15 43 45.1 10 110 -68 -19 46 13 -18 50 25 -19 50 24 -18 46 15 0.27 136 0 0 -19 42 14 15 43 46.1 11 110 -67 -20 10 9 -19 14 22 -20 14 20 -19 10 13 0.27 137 0 0 -20 6 2 15 43 47.1 12 110 -67 -20 33 57 -19 38 12 -20 38 8 -19 34 2 0.27 138 0 0 -20 29 43 15 43 48.3 13 109 -66 -20 57 36 -20 1 54 -21 1 47 -19 57 44 0.27 139 0 0 -20 53 15 15 43 49.6 14 109 -65 -21 21 7 -20 25 26 -21 25 18 -20 21 17 0.27 140 0 0 -21 16 37 15 43 50.9 15 108 -64 -21 44 29 -20 48 50 -21 48 39 -20 44 41 0.27 141 0 0 -21 39 50 15 43 52.4 16 108 -63 -22 7 40 -21 12 4 -22 11 50 -21 7 55 0.27 142 0 0 -22 2 53 15 43 53.9 17 108 -62 -22 30 41 -21 35 8 -22 34 51 -21 30 59 0.27 143 0 0 -22 25 44 15 43 55.5 18 107 -61 -22 53 32 -21 58 1 -22 57 41 -21 53 52 0.27 144 0 0 -22 48 24 15 43 57.2 19 107 -61 -23 16 10 -22 20 42 -23 20 20 -22 16 34 0.27 145 0 0 -23 10 53 15 43 59.0 20 106 -60 -23 38 37 -22 43 12 -23 42 47 -22 39 4 0.27 146 0 0 -23 33 9 15 44 0.9 21 106 -59 -24 0 52 -23 5 30 -24 5 1 -23 1 22 0.27 147 0 0 -23 55 13 15 44 2.8 22 106 -58 -24 22 54 -23 27 36 -24 27 3 -23 23 28 0.27 148 0 0 -24 17 3 15 44 4.9 23 105 -57 -24 44 43 -23 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29 -20 18 46 -21 18 40 -20 14 36 0.28 - 66 0 0 -20 22 56 15 53 2.1 22 253 68 -20 50 50 -19 55 5 -20 55 1 -19 50 56 0.28 - 65 0 0 -19 59 8 15 53 4.1 21 253 69 -20 27 3 -19 31 16 -20 31 14 -19 27 6 0.28 - 64 0 0 -19 35 11 15 53 6.0 20 253 70 -20 3 8 -19 7 19 -20 7 19 -19 3 9 0.28 - 63 0 0 -19 11 7 15 53 7.9 19 252 71 -19 39 4 -18 43 14 -19 43 16 -18 39 4 0.29 - 62 0 0 -18 46 56 15 53 9.6 18 252 71 -19 14 54 -18 19 3 -19 19 5 -18 14 53 0.29 - 61 0 0 -18 22 39 15 53 11.3 17 252 72 -18 50 37 -17 54 45 -18 54 49 -17 50 34 0.29 - 60 0 0 -17 58 15 15 53 12.9 15 251 73 -18 26 14 -17 30 21 -18 30 26 -17 26 10 0.29 - 59 0 0 -17 33 47 15 53 14.3 14 251 73 -18 1 46 -17 5 52 -18 5 57 -17 1 41 0.29 - 58 0 0 -17 9 13 15 53 15.7 13 251 74 -17 37 13 -16 41 18 -17 41 24 -16 37 8 0.29 - 57 0 0 -16 44 36 15 53 17.0 12 250 74 -17 12 35 -16 16 40 -17 16 47 -16 12 30 0.29 - 56 0 0 -16 19 55 15 53 18.1 11 250 75 -16 47 54 -15 51 59 -16 52 6 -15 47 49 0.30 - 55 0 0 -15 55 11 15 53 19.2 10 250 75 -16 23 11 -15 27 16 -16 27 22 -15 23 5 0.30 - 54 0 0 -15 30 25 15 53 20.2 9 249 75 -15 58 24 -15 2 30 -16 2 36 -14 58 19 0.30 - 53 0 0 -15 5 37 15 53 21.1 8 249 75 -15 33 36 -14 37 42 -15 37 48 -14 33 32 0.31 - 52 0 0 -14 40 49 15 53 21.8 7 249 76 -15 8 47 -14 12 54 -15 12 59 -14 8 44 0.31 - 51 0 0 -14 16 0 15 53 22.5 6 249 76 -14 43 58 -13 48 5 -14 48 10 -13 43 55 0.32 - 50 0 0 -13 51 11 15 53 23.1 5 248 76 -14 19 9 -13 23 17 -14 23 20 -13 19 7 0.33 - 49 0 0 -13 26 23 15 53 23.5 4 248 76 -13 54 20 -12 58 30 -13 58 31 -12 54 20 0.34 - 48 0 0 -13 1 36 15 53 23.9 3 248 75 -13 29 33 -12 33 44 -13 33 44 -12 29 34 0.37 - 47 0 0 -12 36 52 15 53 24.1 2 248 75 -13 4 48 -12 9 0 -13 8 59 -12 4 51 0.43 - 46 0 0 -12 12 11 15 53 24.2 1 248 75 -12 40 5 -11 44 20 -12 44 17 -11 40 10 0.64 Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 340-129526 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 15 15.2694 DE: -22 06 49.901 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 15 15.2695 DE: -22 06 49.901 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (431) Nephele asteroid class: approx. diameter [km]: 92 approx. diameter ["]: 0.044 distance from Earth [AU]: 2.89910 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#74 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): 0.019", 0.003", 90.005° remarks: * orbital elements for (431)Nephele : Mean anomaly = 298.2511974407 deg Arg. of pericenter = 217.3762899596 deg Long. of node = 117.1832603256 deg Inclination = 1.8278901516 deg Eccentricity = 0.1706143029 Semimajor axis = 3.1383522665 AU Perihelion dist = 2.6029044823 AU Mag: H = 9.02, G = 0.15 Epoch of elements : MJD 60021.65868055 TDT (2023 Mar 18.6587) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#742023Feb09,4.33,2023,3,18,15.809001,0.008511,-0.254558,11.922922,0.412450,-0.005842,-0.000150,0.000000,0.000000 -138.9226,-22.1073,-55.12,-0.88,False UCAC4 340-129526,18.25424146,-22.1138615,0.00,11.91,0.00,0.0,0,,18.27732285,-22.1073025,2.87,0.00,0,0,0 431,Nephele,14.69,91.5,2.8991,0,0,2.603,1.25,,4.6,0 0,298.1344,2023,3,18,217.3763,117.1833,1.8279,0.17061,3.13835,2.60290,9.04,5.0,0.15 1.075,0.0190,0.0032,90,0.0033,Known errors,-1.00,-1,-1,-1 20230318_129526,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org