IOTA/IOTA-ES occultation update for (431) Nephele / UCAC4-340-121279 event on 2023 Mar 07, 19:14 UT Visible from Australia Summary ------- On 2023 Mar 07 UT, the 91.5 km diameter asteroid (431) Nephele will occult a 12.5 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 2.43 mag to 14.81 mag (the magnitude of the asteroid) for at most 3.630 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 07, 19:10 - 2023 Mar 07, 19:19 * geocentric midpoint of event [JD]: 2460011.30194708 * magnitude of target star: 12.50 * magnitude drop [mag]: 2.43 * estimated maximum duration [s]: 3.630 * Moon: 100 % sunlit, 100° distance * Sun: 76° distance * rough path description: Australia Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 94 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.003", 91°) * approx speed of asteroid's shadow [km/s]: 25.1744 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-340-121279 by 431 Nephele on 2023 Mar 7 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 83 0 0 -13 0 28 19 10 41.5 0 113 -70 -13 28 12 .. .. .. -13 32 27 .. .. .. .... 84 0 0 -13 25 11 19 10 41.6 1 113 -69 -13 52 55 -12 57 31 -13 57 11 -12 53 16 0.25 85 0 0 -13 49 53 19 10 41.7 2 112 -69 -14 17 37 -13 22 12 -14 21 53 -13 17 58 0.25 86 0 0 -14 14 34 19 10 42.0 3 112 -68 -14 42 18 -13 46 53 -14 46 34 -13 42 39 0.25 87 0 0 -14 39 13 19 10 42.3 4 112 -67 -15 6 57 -14 11 32 -15 11 12 -14 7 17 0.25 88 0 0 -15 3 49 19 10 42.7 5 112 -66 -15 31 33 -14 36 8 -15 35 48 -14 31 53 0.24 89 0 0 -15 28 21 19 10 43.2 6 111 -65 -15 56 6 -15 0 41 -16 0 21 -14 56 26 0.24 90 0 0 -15 52 51 19 10 43.8 7 111 -64 -16 20 34 -15 25 10 -16 24 50 -15 20 56 0.24 91 0 0 -16 17 15 19 10 44.4 9 111 -63 -16 44 59 -15 49 35 -16 49 14 -15 45 21 0.24 92 0 0 -16 41 35 19 10 45.2 10 110 -63 -17 9 18 -16 13 55 -17 13 33 -16 9 41 0.24 93 0 0 -17 5 49 19 10 46.0 11 110 -62 -17 33 31 -16 38 10 -17 37 47 -16 33 56 0.24 94 0 0 -17 29 57 19 10 46.9 12 110 -61 -17 57 38 -17 2 18 -18 1 54 -16 58 4 0.24 95 0 0 -17 53 58 19 10 47.9 13 110 -60 -18 21 39 -17 26 20 -18 25 54 -17 22 6 0.24 96 0 0 -18 17 52 19 10 49.0 14 109 -59 -18 45 32 -17 50 15 -18 49 47 -17 46 1 0.24 97 0 0 -18 41 37 19 10 50.2 15 109 -58 -19 9 17 -18 14 1 -19 13 32 -18 9 48 0.24 98 0 0 -19 5 15 19 10 51.4 16 109 -57 -19 32 53 -18 37 40 -19 37 8 -18 33 26 0.24 99 0 0 -19 28 44 19 10 52.7 17 108 -56 -19 56 21 -19 1 10 -20 0 36 -18 56 56 0.24 100 0 0 -19 52 3 19 10 54.1 18 108 -55 -20 19 39 -19 24 30 -20 23 53 -19 20 17 0.24 101 0 0 -20 15 12 19 10 55.6 19 107 -54 -20 42 47 -19 47 40 -20 47 1 -19 43 27 0.24 102 0 0 -20 38 11 19 10 57.1 20 107 -53 -21 5 44 -20 10 40 -21 9 58 -20 6 28 0.24 103 0 0 -21 0 58 19 10 58.7 21 107 -52 -21 28 31 -20 33 30 -21 32 44 -20 29 17 0.24 104 0 0 -21 23 35 19 11 0.4 22 106 -51 -21 51 5 -20 56 7 -21 55 19 -20 51 55 0.24 105 0 0 -21 45 59 19 11 2.1 23 106 -50 -22 13 28 -21 18 33 -22 17 42 -21 14 21 0.24 106 0 0 -22 8 11 19 11 3.9 24 105 -49 -22 35 39 -21 40 47 -22 39 52 -21 36 35 0.24 107 0 0 -22 30 10 19 11 5.8 25 105 -48 -22 57 36 -22 2 48 -23 1 49 -21 58 36 0.24 108 0 0 -22 51 56 19 11 7.8 26 105 -47 -23 19 20 -22 24 36 -23 23 33 -22 20 24 0.24 109 0 0 -23 13 29 19 11 9.8 27 104 -46 -23 40 51 -22 46 10 -23 45 3 -22 41 59 0.24 110 0 0 -23 34 47 19 11 11.8 28 104 -45 -24 2 7 -23 7 30 -24 6 19 -23 3 19 0.24 111 0 0 -23 55 51 19 11 14.0 29 103 -44 -24 23 9 -23 28 36 -24 27 21 -23 24 25 0.24 112 0 0 -24 16 40 19 11 16.2 30 103 -43 -24 43 56 -23 49 27 -24 48 8 -23 45 17 0.24 113 0 0 -24 37 14 19 11 18.4 31 102 -43 -25 4 28 -24 10 3 -25 8 39 -24 5 53 0.24 114 0 0 -24 57 32 19 11 20.7 32 102 -42 -25 24 45 -24 30 23 -25 28 55 -24 26 14 0.24 115 0 0 -25 17 35 19 11 23.1 33 101 -41 -25 44 45 -24 50 28 -25 48 55 -24 46 19 0.24 116 0 0 -25 37 21 19 11 25.5 34 101 -40 -26 4 29 -25 10 17 -26 8 39 -25 6 8 0.24 117 0 0 -25 56 51 19 11 28.0 35 100 -39 -26 23 57 -25 29 49 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Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4-340-121279 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 03 12.2395 DE: -22 10 22.436 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 03 12.2396 DE: -22 10 22.436 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (431) Nephele asteroid class: approx. diameter [km]: 92 approx. diameter ["]: 0.041 distance from Earth [AU]: 3.06440 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): 0.018", 0.003", 91.148° remarks: * orbital elements for (431)Nephele : Mean anomaly = 296.3307041202 deg Arg. of pericenter = 217.3723999612 deg Long. of node = 117.1833200907 deg Inclination = 1.8278881878 deg Eccentricity = 0.1706202844 Semimajor axis = 3.1383960915 AU Perihelion dist = 2.6029220578 AU Mag: H = 9.02, G = 0.15 Epoch of elements : MJD 60010.80194444 TDT (2023 Mar 07.8019) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#742023Feb09,3.63,2023,3,7,19.246730,0.003161,-0.228336,14.208006,0.178938,-0.005685,-0.000015,0.000000,0.000000 177.1987,-22.1731,-105.95,-5.15,False UCAC4-340-121279,18.05339983,-22.1728989,0.00,12.50,0.00,0.0,0,,18.07641258,-22.1730671,2.43,0.00,0,0,0 431,Nephele,14.81,91.5,3.0644,0,0,2.936,0.51,,4.6,0 0,296.1885,2023,3,7,217.3724,117.1833,1.8279,0.17062,3.13840,2.60292,9.04,5.0,0.15 1.077,0.0177,0.0031,91,0.0032,Known errors,-1.00,-1,-1,-1 20230307_121279,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org