IOTA/IOTA-ES occultation update for (431) Nephele / TYC 6843-01286-1 event on 2023 Sep 23, 13:30 UT Visible from Australia Summary ------- On 2023 Sep 23 UT, the 91.5 km diameter asteroid (431) Nephele will occult a 10.8 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 3.44 mag to 14.17 mag (the magnitude of the asteroid) for at most 5.690 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 Sep 23, 13:23 - 2023 Sep 23, 13:37 * geocentric midpoint of event [JD]: 2460211.06281271 * magnitude of target star: 10.78 * magnitude drop [mag]: 3.44 * estimated maximum duration [s]: 5.690 * Moon: 59 % sunlit, 9° distance * Sun: 93° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.000) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.000", 91°) * approx speed of asteroid's shadow [km/s]: 16.0696 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6843-01286-1 by 431 Nephele on 2023 Sep 23 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 - 23 0 0 - 9 35 22 13 23 57.4 0 114 81 -10 3 4 - 9 7 43 -10 3 34 - 9 7 13 .... - 22 0 0 -10 1 30 13 23 57.5 2 113 80 -10 29 12 - 9 33 50 -10 29 43 - 9 33 20 0.23 - 21 0 0 -10 27 39 13 23 57.8 3 113 80 -10 55 22 - 9 59 59 -10 55 53 - 9 59 29 0.22 - 20 0 0 -10 53 49 13 23 58.2 4 113 79 -11 21 33 -10 26 9 -11 22 3 -10 25 38 0.22 - 19 0 0 -11 20 0 13 23 58.8 5 113 78 -11 47 43 -10 52 19 -11 48 14 -10 51 48 0.21 - 18 0 0 -11 46 9 13 23 59.5 6 113 77 -12 13 54 -11 18 28 -12 14 24 -11 17 58 0.21 - 17 0 0 -12 12 18 13 24 0.3 7 112 77 -12 40 2 -11 44 37 -12 40 33 -11 44 6 0.21 - 16 0 0 -12 38 25 13 24 1.3 8 112 76 -13 6 9 -12 10 43 -13 6 39 -12 10 13 0.21 - 15 0 0 -13 4 29 13 24 2.4 9 112 75 -13 32 13 -12 36 48 -13 32 43 -12 36 17 0.21 - 14 0 0 -13 30 30 13 24 3.7 10 112 74 -13 58 14 -13 2 49 -13 58 44 -13 2 19 0.21 - 13 0 0 -13 56 27 13 24 5.1 11 112 73 -14 24 11 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-13 34 4 -12 37 39 0.25 158 0 0 -12 39 49 13 36 55.4 4 247 -77 -13 7 33 -12 12 8 -13 8 3 -12 11 38 0.26 159 0 0 -12 13 45 13 36 55.9 3 247 -77 -12 41 29 -11 46 5 -12 41 59 -11 45 34 0.28 160 0 0 -11 47 40 13 36 56.3 2 247 -77 -12 15 23 -11 19 59 -12 15 54 -11 19 29 0.32 161 0 0 -11 21 33 13 36 56.5 1 246 -77 -11 49 17 -10 53 53 -11 49 47 -10 53 23 0.42 162 0 0 -10 55 26 13 36 56.6 0 246 -76 -11 23 9 .. .. .. -11 23 39 .. .. .. 2.09 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: TYC 6843-01286-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 13 44.0350 DE: -23 19 28.596 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 13 44.0349 DE: -23 19 28.596 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (431) Nephele asteroid class: approx. diameter [km]: 92 approx. diameter ["]: 0.052 distance from Earth [AU]: 2.44330 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#78 date of fit: 2023 Aug 23 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): 0.008", 0.000", 90.622° remarks: * orbital elements for (431)Nephele : Mean anomaly = 331.6868848820 deg Arg. of pericenter = 217.4386625289 deg Long. of node = 117.1822313832 deg Inclination = 1.8279471378 deg Eccentricity = 0.1705208519 Semimajor axis = 3.1376653558 AU Perihelion dist = 2.6026279865 AU Mag: H = 9.13, G = 0.15 Epoch of elements : MJD 60210.56284722 TDT (2023 Sep 23.5628) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#782023Aug23,5.69,2023,9,23,13.507505,-0.002644,-0.190460,9.069257,-0.124951,0.005658,0.000152,0.000000,0.000000 69.0391,-23.3187,-24.50,-0.11,False TYC 6843-01286-1,18.22889864,-23.3246101,0.00,10.78,0.00,0.0,0,,18.25282133,-23.3187227,3.44,0.00,0,0,0 431,Nephele,14.17,91.500,2.4433,0,0,2.371,-0.45,,4.6,0 0,331.5871,2023,9,23,217.4387,117.1822,1.8279,0.17052,3.13767,2.60263,9.02,5.0,0.15 1.009,0.0083,0.0005,91,0.0083,Known errors,-1.00,0,-1,-1 20230923_1286-1,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org