IOTA/IOTA-ES occultation update for (81) Terpsichore / UCAC4 299-123864 event on 2022 Oct 15, 09:50 UT Visible from N Australia Summary ------- On 2022 Oct 15 UT, the 120.8 km diameter asteroid (81) Terpsichore will occult a 11.9 mag star in the constellation Scorpius for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.97 mag to 14.80 mag (the magnitude of the asteroid) for at most 4.180 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 15, 09:46 - 2022 Oct 15, 09:54 * geocentric midpoint of event [JD]: 2459867.91001654 * magnitude of target star: 11.90 * magnitude drop [mag]: 2.97 * estimated maximum duration [s]: 4.180 * Moon: 72 % sunlit, 176° distance * Sun: 62° distance * rough path description: N Australia Additional comments ------------------- poor solution in DR3 The occultation path -------------------- * approximate projected width [km]: 122 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.006", 91°) * approx speed of asteroid's shadow [km/s]: 28.8737 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 299-123864 by 81 Terpsichore on 2022 Oct 15 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 4 0 0 2 37 22 9 46 45.2 0 120 62 1 59 15 3 15 32 1 49 8 3 25 40 .... 5 0 0 2 2 13 9 46 45.2 2 120 63 1 24 9 2 40 21 1 14 2 2 50 30 0.04 6 0 0 1 27 11 9 46 45.4 3 120 64 0 49 8 2 5 17 0 39 2 2 15 25 -0.02 7 0 0 0 52 16 9 46 45.7 4 120 65 0 14 15 1 30 19 0 4 10 1 40 26 -0.04 8 0 0 0 17 29 9 46 46.0 5 120 67 - 0 20 29 0 55 30 - 0 30 34 1 5 36 -0.06 9 0 0 - 0 17 9 9 46 46.5 6 120 68 - 0 55 4 0 20 50 - 1 5 8 0 30 55 -0.07 10 0 0 - 0 51 36 9 46 47.0 7 120 69 - 1 29 29 - 0 13 40 - 1 39 32 - 0 3 35 -0.07 11 0 0 - 1 25 52 9 46 47.6 8 120 70 - 2 3 41 - 0 47 59 - 2 13 44 - 0 37 55 -0.08 12 0 0 - 1 59 55 9 46 48.3 10 120 71 - 2 37 42 - 1 22 6 - 2 47 43 - 1 12 3 -0.08 13 0 0 - 2 33 45 9 46 49.1 11 120 72 - 3 11 28 - 1 56 0 - 3 21 29 - 1 45 57 -0.08 14 0 0 - 3 7 21 9 46 50.0 12 120 73 - 3 45 0 - 2 29 39 - 3 55 0 - 2 19 38 -0.08 15 0 0 - 3 40 42 9 46 50.9 13 120 75 - 4 18 17 - 3 3 4 - 4 28 15 - 2 53 3 -0.09 16 0 0 - 4 13 46 9 46 52.0 14 120 76 - 4 51 17 - 3 36 12 - 5 1 15 - 3 26 13 -0.09 17 0 0 - 4 46 33 9 46 53.1 15 120 77 - 5 24 0 - 4 9 3 - 5 33 57 - 3 59 5 -0.09 18 0 0 - 5 19 3 9 46 54.3 16 120 78 - 5 56 25 - 4 41 37 - 6 6 20 - 4 31 40 -0.09 19 0 0 - 5 51 13 9 46 55.6 18 120 79 - 6 28 31 - 5 13 52 - 6 38 25 - 5 3 56 -0.09 20 0 0 - 6 23 4 9 46 57.0 19 120 80 - 7 0 18 - 5 45 48 - 7 10 11 - 5 35 53 -0.09 21 0 0 - 6 54 35 9 46 58.4 20 120 81 - 7 31 44 - 6 17 24 - 7 41 35 - 6 7 30 -0.09 22 0 0 - 7 25 45 9 47 0.0 21 120 82 - 8 2 49 - 6 48 38 - 8 12 39 - 6 38 46 -0.09 23 0 0 - 7 56 33 9 47 1.6 22 119 83 - 8 33 32 - 7 19 31 - 8 43 21 - 7 9 41 -0.09 24 0 0 - 8 26 58 9 47 3.2 23 119 84 - 9 3 52 - 7 50 2 - 9 13 40 - 7 40 13 -0.09 25 0 0 - 8 57 1 9 47 5.0 24 119 85 - 9 33 49 - 8 20 10 - 9 43 35 - 8 10 22 -0.09 26 0 0 - 9 26 40 9 47 6.8 25 119 86 -10 3 23 - 8 49 54 -10 13 7 - 8 40 7 -0.10 27 0 0 - 9 55 54 9 47 8.7 27 119 87 -10 32 31 - 9 19 14 -10 42 15 - 9 9 29 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time = +/- 1 secs Prediction of 2022 Aug 20.1 Data for the target star ------------------------ * name: UCAC4 299-123864 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 28 58.8449 DE: -30 12 52.653 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 28 58.8449 DE: -30 12 52.653 * position source: Gaia14_DR2 * standard error: RA,DE [mas]: (5.600,5.000) * V mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (81) Terpsichore asteroid class: approx. diameter [km]: 121 approx. diameter ["]: 0.047 distance from Earth [AU]: 3.53280 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#70 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): 0.014", 0.004", 90.607° remarks: * orbital elements for (81)Terpsichore : Mean anomaly = 246.5630317249 deg Arg. of pericenter = 51.5346590621 deg Long. of node = 0.9493802951 deg Inclination = 7.8052761753 deg Eccentricity = 0.2116833715 Semimajor axis = 2.8514349301 AU Perihelion dist = 2.2478335706 AU Mag: H = 8.68, G = 0.15 Epoch of elements : MJD 59867.41000000 TDT (2022 Oct 15.4100) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#702022Aug01,4.18,2022,10,15,9.840397,-0.002618,0.108799,16.274902,0.850207,0.005140,-0.000604,-0.000001,0.000000 91.0852,-30.2335,28.85,-8.58,False UCAC4 299-123864,17.48301250,-30.2146258,0.00,11.90,0.00,0.0,0,,17.50685784,-30.2335110,2.98,0.00,0,0,0 81,Terpsichore,14.80,120.8,3.5328,0,0,3.126,2.12,,5.8,0 0,246.4791,2022,10,15,51.5347,0.9494,7.8053,0.21168,2.85143,2.24783,8.68,5.0,0.15 1.133,0.0154,0.0062,91,0.0063,Known errors,-1.00,-1,-1,-1 20221015_123864,59811.11 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Aug 20, 02:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org