IOTA/IOTA-ES occultation update for (99) Dike / UCAC4 573-006751 event on 2023 Feb 10, 23:48 UT Visible from Europe, SE Canada, E USA Summary ------- On 2023 Feb 10 UT, the 71.6 km diameter asteroid (99) Dike will occult a 11.7 mag star in the constellation Aries for observers along a path across Europe, SE Canada, E USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.73 mag to 15.40 mag (the magnitude of the asteroid) for at most 5.200 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 Feb 10, 23:41 - 2023 Feb 10, 23:56 * geocentric midpoint of event [JD]: 2459986.49216005 * magnitude of target star: 11.71 * magnitude drop [mag]: 3.73 * estimated maximum duration [s]: 5.200 * Moon: 76 % sunlit, 149° distance * Sun: 89° distance * rough path description: Europe, SE Canada, E USA The occultation path -------------------- * approximate projected width [km]: 74 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.003", 58°) * approx speed of asteroid's shadow [km/s]: 13.7658 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 573-006751 by 99 Dike on 2023 Feb 10 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 -178 0 0 - 1 12 8 23 41 14.8 1 65 76 - 1 34 20 - 0 49 52 - 1 39 30 - 0 44 41 .... -177 0 0 - 0 43 57 23 41 15.0 2 65 76 - 1 6 13 - 0 21 37 - 1 11 24 - 0 16 25 -0.28 -176 0 0 - 0 15 20 23 41 15.4 3 65 75 - 0 37 40 0 7 2 - 0 42 52 0 12 15 -0.28 -175 0 0 0 13 41 23 41 16.0 4 65 75 - 0 8 43 0 36 7 - 0 13 55 0 41 21 -0.28 -174 0 0 0 43 6 23 41 16.8 5 65 75 0 20 39 1 5 36 0 15 25 1 10 50 -0.28 -173 0 0 1 12 54 23 41 17.7 6 65 75 0 50 24 1 35 28 0 45 10 1 40 43 -0.28 -172 0 0 1 43 6 23 41 18.9 8 65 74 1 20 32 2 5 43 1 15 17 2 10 59 -0.28 -171 0 0 2 13 40 23 41 20.2 9 65 74 1 51 2 2 36 21 1 45 47 2 41 38 -0.28 -170 0 0 2 44 36 23 41 21.7 10 66 73 2 21 55 3 7 20 2 16 38 3 12 38 -0.28 -169 0 0 3 15 52 23 41 23.4 11 66 72 2 53 8 3 38 40 2 47 51 3 43 58 -0.28 -168 0 0 3 47 29 23 41 25.3 12 66 72 3 24 42 4 10 20 3 19 24 4 15 39 -0.28 -167 0 0 4 19 26 23 41 27.4 13 66 71 3 56 35 4 42 19 3 51 16 4 47 40 -0.28 -166 0 0 4 51 41 23 41 29.6 14 66 70 4 28 47 5 14 38 4 23 27 5 19 58 -0.28 -165 0 0 5 24 13 23 41 32.1 15 66 69 5 1 16 5 47 13 4 55 56 5 52 35 -0.28 -164 0 0 5 57 3 23 41 34.7 17 66 68 5 34 3 6 20 6 5 28 42 6 25 28 -0.28 -163 0 0 6 30 9 23 41 37.5 18 66 68 6 7 6 6 53 15 6 1 45 6 58 38 -0.28 -162 0 0 7 3 30 23 41 40.6 19 66 67 6 40 24 7 26 39 6 35 2 7 32 2 -0.28 -161 0 0 7 37 5 23 41 43.8 20 67 66 7 13 57 8 0 17 7 8 34 8 5 41 -0.28 -160 0 0 8 10 54 23 41 47.2 21 67 65 7 47 43 8 34 8 7 42 20 8 39 32 -0.28 -159 0 0 8 44 54 23 41 50.7 22 67 64 8 21 41 9 8 11 8 16 17 9 13 36 -0.28 -158 0 0 9 19 6 23 41 54.5 23 67 63 8 55 51 9 42 25 8 50 26 9 47 51 -0.28 -157 0 0 9 53 28 23 41 58.4 25 67 62 9 30 11 10 16 49 9 24 46 10 22 15 -0.28 -156 0 0 10 27 59 23 42 2.5 26 68 61 10 4 40 10 51 22 9 59 14 10 56 49 -0.28 -155 0 0 11 2 38 23 42 6.8 27 68 60 10 39 17 11 26 3 10 33 51 11 31 30 -0.28 -154 0 0 11 37 24 23 42 11.3 28 68 59 11 14 1 12 0 51 11 8 35 12 6 18 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.. .. 29 3 24 -3.28 Uncertainty in time = +/- 2 secs Prediction of 2022 Dec 13.0 Data for the target star ------------------------ * name: UCAC4 573-006751 * constellation : Aries * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 05 10.5559 DE: +24 29 57.622 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 05 10.5557 DE: +24 29 57.622 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (99) Dike asteroid class: approx. diameter [km]: 72 approx. diameter ["]: 0.033 distance from Earth [AU]: 3.02720 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#117 date of fit: 2022 Nov 22 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): 0.011", 0.003", 57.884° remarks: * orbital elements for (99)Dike : Mean anomaly = 198.4931853843 deg Arg. of pericenter = 195.5719686630 deg Long. of node = 41.4071853607 deg Inclination = 13.8647342552 deg Eccentricity = 0.1971824998 Semimajor axis = 2.6626738413 AU Perihelion dist = 2.1376411572 AU Mag: H = 9.51, G = 0.15 Epoch of elements : MJD 59985.99222222 TDT (2023 Feb 10.9922) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1172022Nov22,5.20,2023,2,10,23.811841,-0.073244,0.246488,7.446002,2.219706,0.005750,0.001653,0.000000,0.000000 -91.3414,24.5894,-173.63,-14.18,False UCAC4 573-006751,3.08626554,24.4993397,0.00,11.71,0.00,0.0,0,,3.10860628,24.5894154,3.73,0.00,0,0,0 99,Dike,15.40,71.6,3.0272,0,0,1.586,6.45,,3.8,0 0,198.2681,2023,2,10,195.5720,41.4072,13.8647,0.19718,2.66267,2.13764,9.55,5.0,0.15 1.116,0.0107,0.0026,58,0.0038,Known errors,-1.00,-1,-1,-1 20230210_006751,59926.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 13, 00:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org