IOTA/IOTA-ES occultation update for (258) Tyche / UCAC4 413-098505 event on 2022 Oct 07, 18:13 UT Visible from S Africa Summary ------- On 2022 Oct 07 UT, the 65.5 km diameter asteroid (258) Tyche will occult a 12.2 mag star in the constellation Scutum for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.10 mag to 12.84 mag (the magnitude of the asteroid) for at most 3.300 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: 99 * date and approx. time of event: 2022 Oct 07, 18:08 - 2022 Oct 07, 18:18 * geocentric midpoint of event [JD]: 2459860.25938734 * magnitude of target star: 12.23 * magnitude drop [mag]: 1.10 * estimated maximum duration [s]: 3.300 * Moon: 95 % sunlit, 68° distance * Sun: 89° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 70 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.001", 81°) * approx speed of asteroid's shadow [km/s]: 19.8384 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 413-098505 by 258 Tyche on 2022 Oct 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 - 96 0 0 - 5 56 32 18 8 28.6 1 97 89 - 6 15 38 - 5 37 29 - 6 21 16 - 5 31 52 .... - 95 0 0 - 6 4 42 18 8 28.7 2 97 89 - 6 23 49 - 5 45 38 - 6 29 27 - 5 40 1 0.29 - 94 0 0 - 6 13 9 18 8 29.0 3 97 89 - 6 32 16 - 5 54 4 - 6 37 54 - 5 48 27 0.32 - 93 0 0 - 6 21 51 18 8 29.3 4 97 88 - 6 40 59 - 6 2 46 - 6 46 38 - 5 57 9 0.33 - 92 0 0 - 6 30 50 18 8 29.7 5 97 87 - 6 49 59 - 6 11 44 - 6 55 38 - 6 6 7 0.34 - 91 0 0 - 6 40 6 18 8 30.3 6 97 86 - 6 59 15 - 6 20 58 - 7 4 55 - 6 15 21 0.34 - 90 0 0 - 6 49 37 18 8 30.9 7 97 85 - 7 8 48 - 6 30 29 - 7 14 27 - 6 24 51 0.35 - 89 0 0 - 6 59 24 18 8 31.7 8 97 84 - 7 18 36 - 6 40 15 - 7 24 15 - 6 34 37 0.35 - 88 0 0 - 7 9 27 18 8 32.6 9 96 83 - 7 28 39 - 6 50 17 - 7 34 19 - 6 44 39 0.35 - 87 0 0 - 7 19 45 18 8 33.5 10 96 82 - 7 38 59 - 7 0 35 - 7 44 39 - 6 54 56 0.35 - 86 0 0 - 7 30 19 18 8 34.6 11 96 81 - 7 49 33 - 7 11 8 - 7 55 14 - 7 5 29 0.35 - 85 0 0 - 7 41 8 18 8 35.8 12 96 80 - 8 0 23 - 7 21 56 - 8 6 4 - 7 16 17 0.35 - 84 0 0 - 7 52 12 18 8 37.1 13 96 79 - 8 11 28 - 7 32 59 - 8 17 9 - 7 27 19 0.36 - 83 0 0 - 8 3 31 18 8 38.5 14 96 78 - 8 22 48 - 7 44 17 - 8 28 29 - 7 38 37 0.36 - 82 0 0 - 8 15 5 18 8 40.0 15 96 77 - 8 34 22 - 7 55 50 - 8 40 4 - 7 50 10 0.36 - 81 0 0 - 8 26 53 18 8 41.5 16 95 76 - 8 46 11 - 8 7 37 - 8 51 53 - 8 1 56 0.36 - 80 0 0 - 8 38 55 18 8 43.3 17 95 75 - 8 58 15 - 8 19 38 - 9 3 57 - 8 13 58 0.36 - 79 0 0 - 8 51 11 18 8 45.1 18 95 74 - 9 10 32 - 8 31 53 - 9 16 14 - 8 26 13 0.36 - 78 0 0 - 9 3 42 18 8 47.0 19 95 73 - 9 23 3 - 8 44 23 - 9 28 46 - 8 38 42 0.36 - 77 0 0 - 9 16 25 18 8 49.0 20 95 72 - 9 35 48 - 8 57 5 - 9 41 31 - 8 51 24 0.36 - 76 0 0 - 9 29 22 18 8 51.1 21 94 71 - 9 48 46 - 9 10 2 - 9 54 29 - 9 4 20 0.36 - 75 0 0 - 9 42 33 18 8 53.3 22 94 70 -10 1 57 - 9 23 11 -10 7 40 - 9 17 29 0.36 - 74 0 0 - 9 55 56 18 8 55.6 23 94 68 -10 15 21 - 9 36 33 -10 21 5 - 9 30 51 0.36 - 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33.2 0 261 -51 -33 58 54 -33 20 43 -34 4 32 -33 15 6 0.92 Uncertainty in time = +/- 1 secs Prediction of 2022 Aug 20.1 Data for the target star ------------------------ * name: UCAC4 413-098505 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 48 59.6589 DE: -07 24 52.395 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 48 59.6589 DE: -07 24 52.395 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (258) Tyche asteroid class: approx. diameter [km]: 66 approx. diameter ["]: 0.045 distance from Earth [AU]: 2.02180 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#90 date of fit: 2022 Aug 01 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): 0.017", 0.001", 81.11° remarks: * orbital elements for (258)Tyche : Mean anomaly = 323.7047646291 deg Arg. of pericenter = 155.6740527643 deg Long. of node = 207.5429495449 deg Inclination = 14.3276035562 deg Eccentricity = 0.2050923369 Semimajor axis = 2.6143297567 AU Perihelion dist = 2.0781507575 AU Mag: H = 8.37, G = 0.23 Epoch of elements : MJD 59859.75944444 TDT (2022 Oct 07.7594) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#902022Aug01,3.30,2022,10,7,18.225296,-0.081590,-0.328643,10.867939,-2.695929,0.005430,0.000535,0.000000,0.000000 -7.1978,-7.3881,-96.44,-5.70,False UCAC4 413-098505,18.81657195,-7.4145541,0.00,12.23,0.00,0.0,0,,18.83684336,-7.3880776,1.10,0.00,0,0,0 258,Tyche,12.84,65.5,2.0218,0,0,3.178,-11.72,,3.6,0 0,323.5277,2022,10,7,155.6741,207.5429,14.3276,0.20509,2.61433,2.07815,8.37,5.0,0.15 1.147,0.0167,0.0013,81,0.0066,Known errors,-1.00,-1,-1,-1 20221007_098505,59811.11 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Aug 20, 02:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org