IOTA/IOTA-ES occultation update for (931) Whittemora / TYC 5610-00176-1 event on 2023 Jun 11, 12:09 UT Visible from N Australia Summary ------- On 2023 Jun 11 UT, the 45.9 km diameter asteroid (931) Whittemora will occult a 8.8 mag star in the constellation Libra 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 6.39 mag to 15.14 mag (the magnitude of the asteroid) for at most 3.160 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: 2023 Jun 11, 12:02 - 2023 Jun 11, 12:17 * geocentric midpoint of event [JD]: 2460107.00669096 * magnitude of target star: 8.75 * magnitude drop [mag]: 6.39 * estimated maximum duration [s]: 3.160 * Moon: 43 % sunlit, 121° distance * Sun: 155° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.003", 108°) * approx speed of asteroid's shadow [km/s]: 14.5245 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5610-00176-1 by 931 Whittemora on 2023 Jun 11 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 63 0 0 -10 23 17 12 16 52.9 1 99 16 -10 10 34 -10 36 0 -10 2 10 -10 44 24 .... 64 0 0 -10 32 18 12 16 52.8 2 98 15 -10 19 36 -10 45 1 -10 11 12 -10 53 25 0.13 65 0 0 -10 41 16 12 16 52.5 3 98 14 -10 28 34 -10 53 59 -10 20 10 -11 2 23 0.13 66 0 0 -10 50 11 12 16 52.1 4 98 13 -10 37 28 -11 2 53 -10 29 5 -11 11 18 0.13 67 0 0 -10 59 2 12 16 51.6 5 98 12 -10 46 20 -11 11 44 -10 37 56 -11 20 9 0.13 68 0 0 -11 7 49 12 16 50.9 6 98 11 -10 55 7 -11 20 32 -10 46 44 -11 28 56 0.13 69 0 0 -11 16 33 12 16 50.1 7 97 11 -11 3 51 -11 29 15 -10 55 28 -11 37 39 0.13 70 0 0 -11 25 13 12 16 49.2 8 97 10 -11 12 31 -11 37 55 -11 4 8 -11 46 19 0.14 71 0 0 -11 33 48 12 16 48.1 8 97 9 -11 21 7 -11 46 30 -11 12 43 -11 54 54 0.14 72 0 0 -11 42 20 12 16 46.9 9 97 8 -11 29 38 -11 55 2 -11 21 15 -12 3 26 0.14 73 0 0 -11 50 47 12 16 45.6 10 97 7 -11 38 5 -12 3 29 -11 29 42 -12 11 52 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15 5 12 2 41.6 16 263 -37 - 8 2 22 - 8 27 48 - 7 53 58 - 8 36 13 0.14 -127 0 0 - 8 5 46 12 2 39.5 15 263 -36 - 7 53 3 - 8 18 29 - 7 44 39 - 8 26 54 0.14 -126 0 0 - 7 56 27 12 2 37.5 14 263 -35 - 7 43 44 - 8 9 10 - 7 35 20 - 8 17 35 0.15 -125 0 0 - 7 47 7 12 2 35.6 13 263 -34 - 7 34 24 - 7 59 51 - 7 26 0 - 8 8 15 0.15 -124 0 0 - 7 37 48 12 2 33.9 12 263 -34 - 7 25 5 - 7 50 31 - 7 16 40 - 7 58 56 0.15 -123 0 0 - 7 28 28 12 2 32.3 11 263 -33 - 7 15 45 - 7 41 11 - 7 7 21 - 7 49 36 0.15 -122 0 0 - 7 19 9 12 2 30.8 10 263 -32 - 7 6 26 - 7 31 52 - 6 58 2 - 7 40 17 0.15 -121 0 0 - 7 9 50 12 2 29.5 9 262 -31 - 6 57 7 - 7 22 33 - 6 48 43 - 7 30 58 0.15 -120 0 0 - 7 0 32 12 2 28.3 8 262 -30 - 6 47 49 - 7 13 15 - 6 39 25 - 7 21 40 0.15 -119 0 0 - 6 51 15 12 2 27.2 7 262 -29 - 6 38 32 - 7 3 58 - 6 30 8 - 7 12 23 0.15 -118 0 0 - 6 41 58 12 2 26.3 6 262 -28 - 6 29 15 - 6 54 41 - 6 20 51 - 7 3 6 0.16 -117 0 0 - 6 32 43 12 2 25.5 5 262 -27 - 6 20 0 - 6 45 26 - 6 11 36 - 6 53 51 0.16 -116 0 0 - 6 23 29 12 2 24.8 4 262 -26 - 6 10 47 - 6 36 12 - 6 2 23 - 6 44 37 0.16 -115 0 0 - 6 14 17 12 2 24.2 3 262 -25 - 6 1 34 - 6 27 0 - 5 53 10 - 6 35 25 0.17 -114 0 0 - 6 5 7 12 2 23.8 2 262 -24 - 5 52 24 - 6 17 50 - 5 44 0 - 6 26 14 0.19 -113 0 0 - 5 55 58 12 2 23.6 1 262 -23 - 5 43 15 - 6 8 41 - 5 34 51 - 6 17 5 0.22 -112 0 0 - 5 46 51 12 2 23.4 0 261 -22 - 5 34 9 - 5 59 34 - 5 25 45 - 6 7 59 0.40 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 5610-00176-1 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 49 51.7790 DE: -08 28 12.431 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 49 51.7789 DE: -08 28 12.431 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 8.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (931) Whittemora asteroid class: approx. diameter [km]: 46 approx. diameter ["]: 0.021 distance from Earth [AU]: 2.96540 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#61 date of fit: 2023 Apr 24 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", 108.345° remarks: * orbital elements for (931)Whittemora : Mean anomaly = 173.7632516739 deg Arg. of pericenter = 315.4505355452 deg Long. of node = 110.9699294635 deg Inclination = 11.4838292359 deg Eccentricity = 0.2335952159 Semimajor axis = 3.1694517464 AU Perihelion dist = 2.4290829813 AU Mag: H = 9.29, G = 0.15 Epoch of elements : MJD 60106.50666667 TDT (2023 Jun 11.5067) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,3.16,2023,6,11,12.160583,0.005848,-0.139760,-8.191367,-0.329991,0.001924,-0.001493,0.000001,0.000000 155.7987,-8.5419,-2.50,23.09,False TYC 5610-00176-1,15.83104972,-8.4701199,0.00,8.75,0.00,0.0,0,,15.85234407,-8.5419037,6.39,0.00,0,0,0 931,Whittemora,15.14,45.9,2.9654,0,0,-1.637,-0.98,,3.2,0 0,173.6748,2023,6,11,315.4505,110.9699,11.4838,0.23360,3.16945,2.42908,9.33,5.0,0.15 1.331,0.0180,0.0033,108,0.0071,Known errors,-1.00,-1,-1,-1 20230611_0176-1,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org