IOTA/IOTA-ES occultation update for (407) Arachne / UCAC4 391-128468 event on 2022 Oct 28, 17:18 UT Visible from Africa Summary ------- On 2022 Oct 28 UT, the 94.1 km diameter asteroid (407) Arachne will occult a 11.8 mag star in the constellation Aquarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.31 mag to 13.94 mag (the magnitude of the asteroid) for at most 6.530 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: 2022 Oct 28, 17:11 - 2022 Oct 28, 17:25 * geocentric midpoint of event [JD]: 2459881.22107758 * magnitude of target star: 11.77 * magnitude drop [mag]: 2.31 * estimated maximum duration [s]: 6.530 * Moon: 13 % sunlit, 55° distance * Sun: 96° distance * rough path description: Africa Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 100 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 67°) * approx speed of asteroid's shadow [km/s]: 14.4139 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 391-128468 by 407 Arachne on 2022 Oct 28 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 - 80 0 0 -33 56 30 17 11 24.8 0 104 69 -34 24 32 -33 28 33 -34 27 27 -33 25 38 .... - 79 0 0 -34 9 5 17 11 24.9 1 104 69 -34 37 5 -33 41 10 -34 40 0 -33 38 16 0.31 - 78 0 0 -34 21 25 17 11 25.1 2 103 69 -34 49 23 -33 53 31 -34 52 18 -33 50 37 0.33 - 77 0 0 -34 33 28 17 11 25.4 3 102 68 -35 1 25 -34 5 37 -35 4 19 -34 2 43 0.34 - 76 0 0 -34 45 17 17 11 25.9 4 102 68 -35 13 11 -34 17 27 -35 16 5 -34 14 34 0.35 - 75 0 0 -34 56 49 17 11 26.4 5 101 67 -35 24 41 -34 29 2 -35 27 36 -34 26 8 0.35 - 74 0 0 -35 8 5 17 11 27.0 5 101 67 -35 35 55 -34 40 20 -35 38 50 -34 37 26 0.35 - 73 0 0 -35 19 5 17 11 27.7 6 100 67 -35 46 54 -34 51 22 -35 49 48 -34 48 29 0.35 - 72 0 0 -35 29 49 17 11 28.5 7 100 66 -35 57 36 -35 2 7 -36 0 30 -34 59 15 0.35 - 71 0 0 -35 40 17 17 11 29.4 8 99 66 -36 8 2 -35 12 37 -36 10 55 -35 9 44 0.36 - 70 0 0 -35 50 28 17 11 30.4 9 98 65 -36 18 11 -35 22 50 -36 21 5 -35 19 58 0.36 - 69 0 0 -36 0 23 17 11 31.5 10 98 64 -36 28 4 -35 32 47 -36 30 57 -35 29 54 0.36 - 68 0 0 -36 10 1 17 11 32.7 10 97 64 -36 37 41 -35 42 27 -36 40 34 -35 39 35 0.36 - 67 0 0 -36 19 23 17 11 34.0 11 97 63 -36 47 1 -35 51 51 -36 49 54 -35 48 59 0.36 - 66 0 0 -36 28 29 17 11 35.3 12 96 63 -36 56 4 -36 0 58 -36 58 57 -35 58 6 0.36 - 65 0 0 -36 37 17 17 11 36.8 13 95 62 -37 4 51 -36 9 48 -37 7 44 -36 6 56 0.36 - 64 0 0 -36 45 49 17 11 38.4 14 95 62 -37 13 21 -36 18 21 -37 16 14 -36 15 30 0.36 - 63 0 0 -36 54 4 17 11 40.0 15 94 61 -37 21 35 -36 26 38 -37 24 27 -36 23 47 0.36 - 62 0 0 -37 2 2 17 11 41.7 15 94 60 -37 29 31 -36 34 38 -37 32 23 -36 31 47 0.36 - 61 0 0 -37 9 43 17 11 43.5 16 93 60 -37 37 11 -36 42 21 -37 40 3 -36 39 30 0.36 - 60 0 0 -37 17 8 17 11 45.5 17 92 59 -37 44 34 -36 49 46 -37 47 26 -36 46 56 0.36 - 59 0 0 -37 24 15 17 11 47.4 18 92 58 -37 51 40 -36 56 55 -37 54 32 -36 54 5 0.36 - 58 0 0 -37 31 6 17 11 49.5 19 91 58 -37 58 29 -37 3 47 -38 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90 0 0 - 8 36 50 17 25 0.1 16 260 -68 - 9 5 10 - 8 8 36 - 9 8 7 - 8 5 39 0.39 91 0 0 - 8 19 54 17 25 2.4 15 260 -68 - 8 48 12 - 7 51 42 - 8 51 9 - 7 48 46 0.39 92 0 0 - 8 3 14 17 25 4.4 14 260 -69 - 8 31 30 - 7 35 3 - 8 34 27 - 7 32 8 0.39 93 0 0 - 7 46 49 17 25 6.3 13 259 -69 - 8 15 3 - 7 18 41 - 8 18 0 - 7 15 45 0.39 94 0 0 - 7 30 40 17 25 8.1 11 259 -69 - 7 58 52 - 7 2 34 - 8 1 49 - 6 59 38 0.39 95 0 0 - 7 14 48 17 25 9.7 10 259 -70 - 7 42 57 - 6 46 43 - 7 45 54 - 6 43 48 0.39 96 0 0 - 6 59 11 17 25 11.2 9 259 -70 - 7 27 19 - 6 31 9 - 7 30 15 - 6 28 14 0.40 97 0 0 - 6 43 52 17 25 12.5 8 259 -70 - 7 11 57 - 6 15 51 - 7 14 53 - 6 12 57 0.40 98 0 0 - 6 28 49 17 25 13.7 7 259 -70 - 6 56 53 - 6 0 51 - 6 59 49 - 5 57 56 0.40 99 0 0 - 6 14 4 17 25 14.7 6 259 -70 - 6 42 6 - 5 46 8 - 6 45 1 - 5 43 13 0.41 100 0 0 - 5 59 36 17 25 15.5 5 259 -70 - 6 27 36 - 5 31 42 - 6 30 31 - 5 28 48 0.42 101 0 0 - 5 45 26 17 25 16.2 4 258 -70 - 6 13 24 - 5 17 34 - 6 16 19 - 5 14 40 0.43 102 0 0 - 5 31 34 17 25 16.8 3 258 -70 - 5 59 30 - 5 3 43 - 6 2 25 - 5 0 50 0.45 103 0 0 - 5 18 0 17 25 17.2 2 258 -70 - 5 45 54 - 4 50 11 - 5 48 48 - 4 47 18 0.49 104 0 0 - 5 4 44 17 25 17.4 1 258 -69 - 5 32 36 - 4 36 58 - 5 35 31 - 4 34 4 0.59 105 0 0 - 4 51 47 17 25 17.5 0 258 -69 - 5 19 37 - 4 24 2 - 5 22 31 - 4 21 9 1.65 Uncertainty in time = +/- 2 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: UCAC4 391-128468 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 48 58.5887 DE: -11 59 01.771 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 48 58.5884 DE: -11 59 01.772 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (407) Arachne asteroid class: approx. diameter [km]: 94 approx. diameter ["]: 0.060 distance from Earth [AU]: 2.16500 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#61 date of fit: 2022 Sep 21 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): 0.016", 0.002", 67.016° remarks: * orbital elements for (407)Arachne : Mean anomaly = 323.6677505085 deg Arg. of pericenter = 82.0849304610 deg Long. of node = 294.5686575514 deg Inclination = 7.5193300213 deg Eccentricity = 0.0707903486 Semimajor axis = 2.6251934668 AU Perihelion dist = 2.4393551061 AU Mag: H = 9.17, G = 0.15 Epoch of elements : MJD 59880.72118055 TDT (2022 Oct 28.7212) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612022Sep21,6.53,2022,10,28,17.305862,0.086389,-0.325774,7.865531,2.078749,0.005508,0.001486,0.000000,0.000000 15.9339,-11.8998,-83.64,-13.28,False UCAC4 391-128468,20.81627459,-11.9838254,0.00,11.77,0.00,0.0,0,,20.83689627,-11.8998314,2.31,0.00,0,0,0 407,Arachne,13.94,94.1,2.1650,0,0,2.177,8.45,,6.2,0 0,323.5006,2022,10,28,82.0849,294.5687,7.5193,0.07079,2.62519,2.43936,9.18,5.0,0.15 1.052,0.0157,0.0022,67,0.0031,Known errors,-1.00,-1,-1,-1 20221028_128468,59868.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org