IOTA/IOTA-ES occultation update for (164) Eva / TYC 1251-00335-1 event on 2022 Dec 13, 14:18 UT Visible from Japan, Russia Summary ------- On 2022 Dec 13 UT, the 104.5 km diameter asteroid (164) Eva will occult a 11.9 mag star in the constellation Taurus for observers along a path across Japan, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.45 mag to 11.21 mag (the magnitude of the asteroid) for at most 8.280 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: 98 * date and approx. time of event: 2022 Dec 13, 14:10 - 2022 Dec 13, 14:26 * geocentric midpoint of event [JD]: 2459927.09628208 * magnitude of target star: 11.94 * magnitude drop [mag]: 0.45 * estimated maximum duration [s]: 8.280 * Moon: 76 % sunlit, 77° distance * Sun: 162° distance * rough path description: Japan, Russia The occultation path -------------------- * approximate projected width [km]: 118 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.040, +/- 0.028) * 1 sigma uncertainty ellipse (major, minor, PA): (0.048", 0.007", 56°) * approx speed of asteroid's shadow [km/s]: 12.6247 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1251-00335-1 by 164 Eva on 2022 Dec 13 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 ' " Longitude Longitude Longitude Longitude .. .. .. -12 0 0 .. .. .... .. .. .. ... .. .. -146 28 30 ... .. .. -147 44 6 .... -147 52 1 -11 0 0 14 11 11.5 2 287 -17 -146 6 56 -149 30 35 ... .. .. -150 38 13 .... -150 43 22 -10 0 0 14 11 13.3 5 288 -20 -149 9 19 -152 12 45 -147 58 10 -153 14 40 -0.38 Latitude Latitude Latitude Latitude -151 0 0 - 9 53 48 14 11 13.5 5 288 -20 - 9 19 44 -10 27 41 - 8 55 4 -10 51 59 -0.52 -152 0 0 - 9 30 54 14 11 14.6 6 288 -21 - 8 56 41 -10 4 57 - 8 31 54 -10 29 21 -0.48 -153 0 0 - 9 7 9 14 11 15.8 7 288 -22 - 8 32 46 - 9 41 21 - 8 7 52 -10 5 52 -0.49 -154 0 0 - 8 42 31 14 11 17.3 8 288 -23 - 8 7 58 - 9 16 53 - 7 42 57 - 9 41 32 -0.49 -155 0 0 - 8 17 1 14 11 18.9 9 289 -24 - 7 42 18 - 8 51 33 - 7 17 9 - 9 16 19 -0.49 -156 0 0 - 7 50 39 14 11 20.8 11 289 -25 - 7 15 45 - 8 25 22 - 6 50 29 - 8 50 15 -0.49 -157 0 0 - 7 23 25 14 11 22.8 12 289 -26 - 6 48 19 - 7 58 18 - 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-7 66 39 58 65 26 47 67 6 35 65 0 39 -0.56 11 0 0 65 48 55 14 26 1.4 6 63 -6 66 25 52 65 12 11 66 52 39 64 45 53 -0.56 10 0 0 65 34 2 14 26 1.9 6 62 -6 66 11 15 64 57 4 66 38 14 64 30 35 -0.56 9 0 0 65 18 37 14 26 2.4 5 61 -5 65 56 6 64 41 24 66 23 16 64 14 44 -0.57 8 0 0 65 2 40 14 26 2.9 5 60 -5 65 40 24 64 25 10 66 7 46 63 58 19 -0.57 7 0 0 64 46 8 14 26 3.3 4 59 -4 65 24 9 64 8 22 65 51 43 63 41 19 -0.58 6 0 0 64 29 1 14 26 3.6 4 58 -4 65 7 19 63 50 59 65 35 5 63 23 44 -0.59 5 0 0 64 11 18 14 26 4.0 3 57 -3 64 49 53 63 32 59 65 17 52 63 5 33 -0.60 4 0 0 63 52 58 14 26 4.3 3 56 -3 64 31 51 63 14 22 65 0 2 62 46 44 -0.62 3 0 0 63 34 0 14 26 4.5 2 55 -2 64 13 11 62 55 7 64 41 35 62 27 16 -0.65 2 0 0 63 14 23 14 26 4.7 2 55 -2 63 53 52 62 35 12 64 22 30 62 7 9 -0.70 1 0 0 62 54 6 14 26 4.8 1 54 -1 63 33 53 62 14 37 64 2 45 61 46 21 -0.80 0 0 0 62 33 8 14 26 4.9 0 53 -1 63 13 14 61 53 20 63 42 19 .. .. .. -1.15 - 1 0 0 .. .. .... .. .. .. .. .. .. 62 51 52 .. .. .. 63 21 11 .. .. .. .... - 2 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 62 59 21 .. .. .. .... Uncertainty in time = +/- 3 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: TYC 1251-00335-1 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 09 02.9854 DE: +16 41 48.296 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 09 02.9853 DE: +16 41 48.296 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (164) Eva asteroid class: approx. diameter [km]: 105 approx. diameter ["]: 0.129 distance from Earth [AU]: 1.11560 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#96 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): 0.048", 0.007", 55.533° remarks: * orbital elements for (164)Eva : Mean anomaly = 36.6316744777 deg Arg. of pericenter = 284.0081537159 deg Long. of node = 76.7895156431 deg Inclination = 24.4768207832 deg Eccentricity = 0.3472343182 Semimajor axis = 2.6311189480 AU Perihelion dist = 1.7175041541 AU Mag: H = 8.80, G = 0.15 Epoch of elements : MJD 59926.59618055 TDT (2022 Dec 13.5962) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#962022Nov22,8.28,2022,12,13,14.310770,0.295837,0.356795,-5.485512,4.548085,0.001566,0.000685,0.000001,0.000000 125.6823,16.7578,-36.11,-23.17,False TYC 1251-00335-1,4.15082928,16.6967490,0.00,11.94,0.00,0.0,0,,4.17284586,16.7577550,0.45,0.00,0,0,0 164,Eva,11.21,104.5,1.1156,0,0,-3.009,35.85,,5.8,0 0,36.4940,2022,12,13,284.0082,76.7895,24.4768,0.34723,2.63112,1.71750,8.80,5.0,0.15 1.360,0.0483,0.0070,56,0.0465,Known errors,-1.00,-1,-1,-1 20221213_0335-1,59914.08 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org