IOTA/IOTA-ES occultation update for (247) Eukrate / TYC 7813-01007-1 event on 2022 May 10, 06:07 UT Visible from South America Summary ------- On 2022 May 10 UT, the 141.7 km diameter asteroid (247) Eukrate will occult a 9.8 mag star in the constellation Lupus for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.68 mag to 13.44 mag (the magnitude of the asteroid) for at most 8.590 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 May 10, 06:01 - 2022 May 10, 06:13 * geocentric midpoint of event [JD]: 2459709.75516359 * magnitude of target star: 9.80 * magnitude drop [mag]: 3.68 * estimated maximum duration [s]: 8.590 * Moon: 62 % sunlit, 79° distance * Sun: 153° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 155 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.015) * 1 sigma uncertainty ellipse (major, minor, PA): (0.024", 0.002", 127°) * approx speed of asteroid's shadow [km/s]: 16.4920 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7813-01007-1 by 247 Eukrate on 2022 May 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 -172 0 0 22 57 59 6 13 18.5 0 138 -4 .. .. .. 21 55 16 .. .. .. 21 36 15 .... -171 0 0 21 57 1 6 13 18.3 1 138 -5 23 0 12 20 54 37 23 19 41 20 35 41 -0.09 -170 0 0 20 56 12 6 13 18.0 3 138 -6 21 59 3 19 54 7 22 18 26 19 35 18 -0.28 -169 0 0 19 55 36 6 13 17.4 4 139 -8 20 58 6 18 53 52 21 17 22 18 35 8 -0.34 -168 0 0 18 55 16 6 13 16.5 6 139 -9 19 57 24 17 53 54 20 16 33 17 35 16 -0.37 -167 0 0 17 55 16 6 13 15.4 7 139 -10 18 57 0 16 54 16 19 16 2 16 35 45 -0.39 -166 0 0 16 55 38 6 13 14.1 8 140 -11 17 56 59 15 55 1 18 15 54 15 36 37 -0.41 -165 0 0 15 56 27 6 13 12.6 10 140 -13 16 57 23 14 56 13 17 16 10 14 37 56 -0.42 -164 0 0 14 57 44 6 13 10.8 11 140 -14 15 58 16 13 57 54 16 16 55 13 39 45 -0.42 -163 0 0 13 59 33 6 13 8.7 12 141 -15 14 59 39 13 0 8 15 18 11 12 42 5 -0.43 -162 0 0 13 1 56 6 13 6.5 14 141 -16 14 1 37 12 2 56 14 20 0 11 45 1 -0.43 -161 0 0 12 4 56 6 13 4.0 15 141 -18 13 4 11 11 6 21 13 22 26 10 48 33 -0.44 -160 0 0 11 8 35 6 13 1.3 16 141 -19 12 7 23 10 10 25 12 25 30 9 52 45 -0.44 -159 0 0 10 12 54 6 12 58.4 18 142 -20 11 11 16 9 15 10 11 29 15 8 57 38 -0.44 -158 0 0 9 17 57 6 12 55.3 19 142 -21 10 15 53 8 20 38 10 33 43 8 3 14 -0.44 -157 0 0 8 23 45 6 12 52.0 20 142 -23 9 21 14 7 26 52 9 38 56 7 9 35 -0.45 -156 0 0 7 30 19 6 12 48.5 22 142 -24 8 27 21 6 33 52 8 44 55 6 16 43 -0.45 -155 0 0 6 37 41 6 12 44.8 23 142 -25 7 34 17 5 41 39 7 51 42 5 24 38 -0.45 -154 0 0 5 45 52 6 12 41.0 24 143 -26 6 42 2 4 50 16 6 59 19 4 33 23 -0.45 -153 0 0 4 54 54 6 12 37.0 25 143 -28 5 50 38 3 59 44 6 7 47 3 42 58 -0.45 -152 0 0 4 4 48 6 12 32.8 27 143 -29 5 0 5 3 10 3 5 17 6 2 53 24 -0.45 -151 0 0 3 15 34 6 12 28.5 28 143 -30 4 10 26 2 21 14 4 27 19 2 4 43 -0.45 -150 0 0 2 27 14 6 12 24.0 29 144 -31 3 21 40 1 33 19 3 38 25 1 16 55 -0.45 -149 0 0 1 39 48 6 12 19.4 30 144 -32 2 33 48 0 46 17 2 50 26 0 30 1 -0.45 -148 0 0 0 53 16 6 12 14.6 32 144 -34 1 46 52 0 0 10 2 3 21 - 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61 0 0 -13 21 48 6 3 35.1 44 222 -60 -12 36 6 -14 7 12 -12 22 4 -14 21 2 -0.46 - 60 0 0 -12 57 40 6 3 29.9 43 222 -59 -12 11 44 -13 43 18 -11 57 37 -13 57 12 -0.46 - 59 0 0 -12 32 41 6 3 24.7 42 223 -58 -11 46 30 -13 18 33 -11 32 19 -13 32 31 -0.46 - 58 0 0 -12 6 49 6 3 19.6 41 223 -57 -11 20 23 -12 52 56 -11 6 7 -13 6 58 -0.46 - 57 0 0 -11 40 4 6 3 14.6 40 223 -56 -10 53 23 -12 26 26 -10 39 2 -12 40 33 -0.46 - 56 0 0 -11 12 27 6 3 9.6 39 223 -55 -10 25 29 -11 59 5 -10 11 4 -12 13 16 -0.46 - 55 0 0 -10 43 55 6 3 4.7 38 223 -54 - 9 56 41 -11 30 50 - 9 42 11 -11 45 6 -0.46 - 54 0 0 -10 14 30 6 2 59.9 37 223 -53 - 9 26 59 -11 1 41 - 9 12 23 -11 16 3 -0.46 - 53 0 0 - 9 44 11 6 2 55.1 36 223 -52 - 8 56 22 -10 31 39 - 8 41 41 -10 46 6 -0.46 - 52 0 0 - 9 12 56 6 2 50.4 35 223 -51 - 8 24 50 -10 0 42 - 8 10 3 -10 15 14 -0.46 - 51 0 0 - 8 40 47 6 2 45.8 34 223 -50 - 7 52 21 - 9 28 50 - 7 37 28 - 9 43 28 -0.47 - 50 0 0 - 8 7 41 6 2 41.3 32 224 -48 - 7 18 57 - 8 56 4 - 7 3 58 - 9 10 47 -0.47 - 49 0 0 - 7 33 39 6 2 36.9 31 224 -47 - 6 44 35 - 8 22 21 - 6 29 31 - 8 37 10 -0.47 - 48 0 0 - 6 58 41 6 2 32.6 30 224 -46 - 6 9 17 - 7 47 43 - 5 54 6 - 8 2 38 -0.47 - 47 0 0 - 6 22 47 6 2 28.4 29 224 -45 - 5 33 2 - 7 12 8 - 5 17 44 - 7 27 9 -0.47 - 46 0 0 - 5 45 55 6 2 24.3 28 224 -44 - 4 55 49 - 6 35 37 - 4 40 25 - 6 50 44 -0.47 - 45 0 0 - 5 8 5 6 2 20.3 27 224 -43 - 4 17 38 - 5 58 8 - 4 2 7 - 6 13 22 -0.47 - 44 0 0 - 4 29 19 6 2 16.5 26 224 -42 - 3 38 29 - 5 19 43 - 3 22 52 - 5 35 3 -0.47 - 43 0 0 - 3 49 34 6 2 12.7 25 224 -41 - 2 58 22 - 4 40 21 - 2 42 38 - 4 55 47 -0.47 - 42 0 0 - 3 8 52 6 2 9.1 24 224 -39 - 2 17 17 - 4 0 1 - 2 1 25 - 4 15 34 -0.47 - 41 0 0 - 2 27 12 6 2 5.7 22 224 -38 - 1 35 13 - 3 18 44 - 1 19 14 - 3 34 24 -0.47 - 40 0 0 - 1 44 34 6 2 2.3 21 224 -37 - 0 52 12 - 2 36 29 - 0 36 5 - 2 52 16 -0.47 - 39 0 0 - 1 0 58 6 1 59.2 20 224 -36 - 0 8 12 - 1 53 17 0 8 2 - 2 9 11 -0.47 - 38 0 0 - 0 16 25 6 1 56.1 19 224 -35 0 36 46 - 1 9 8 0 53 8 - 1 25 9 -0.47 - 37 0 0 0 29 6 6 1 53.3 17 224 -34 1 22 42 - 0 24 2 1 39 12 - 0 40 11 -0.47 - 36 0 0 1 15 33 6 1 50.6 16 224 -32 2 9 35 0 22 1 2 26 13 0 5 45 -0.48 - 35 0 0 2 2 57 6 1 48.1 15 224 -31 2 57 25 1 9 0 3 14 11 0 52 36 -0.48 - 34 0 0 2 51 17 6 1 45.7 14 224 -30 3 46 11 1 56 55 4 3 5 1 40 23 -0.48 - 33 0 0 3 40 33 6 1 43.6 12 225 -29 4 35 53 2 45 44 4 52 55 2 29 5 -0.48 - 32 0 0 4 30 43 6 1 41.6 11 225 -27 5 26 30 3 35 28 5 43 40 3 18 41 -0.48 - 31 0 0 5 21 46 6 1 39.9 10 225 -26 6 18 0 4 26 6 6 35 19 4 9 11 -0.48 - 30 0 0 6 13 42 6 1 38.3 9 225 -25 7 10 24 5 17 36 7 27 51 5 0 33 -0.48 - 29 0 0 7 6 30 6 1 37.0 7 225 -24 8 3 38 6 9 57 8 21 14 5 52 46 -0.49 - 28 0 0 8 0 8 6 1 35.9 6 225 -22 8 57 43 7 3 8 9 15 27 6 45 50 -0.49 - 27 0 0 8 54 34 6 1 35.0 5 225 -21 9 52 37 7 57 8 10 10 30 7 39 42 -0.50 - 26 0 0 9 49 47 6 1 34.3 3 225 -20 10 48 17 8 51 55 11 6 19 8 34 21 -0.50 - 25 0 0 10 45 46 6 1 33.8 2 226 -19 11 44 43 9 47 27 12 2 52 9 29 45 -0.53 - 24 0 0 11 42 27 6 1 33.6 1 226 -17 .. .. .. 10 43 42 .. .. .. 10 25 52 -0.67 Uncertainty in time = +/- 3 secs Prediction of 2022 Apr 15.8 Data for the target star ------------------------ * name: TYC 7813-01007-1 * constellation : Lupus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 23 26.6617 DE: -42 48 41.929 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 23 26.6617 DE: -42 48 41.929 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (247) Eukrate asteroid class: approx. diameter [km]: 142 approx. diameter ["]: 0.079 distance from Earth [AU]: 2.48020 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#97 date of fit: 2022 Apr 14 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): 0.024", 0.002", 126.984° remarks: * orbital elements for (247)Eukrate : Mean anomaly = 173.4733753817 deg Arg. of pericenter = 55.3242551344 deg Long. of node = 0.0525105260 deg Inclination = 24.9572437327 deg Eccentricity = 0.2457826143 Semimajor axis = 2.7404074911 AU Perihelion dist = 2.0668629738 AU Mag: H = 8.33, G = 0.15 Epoch of elements : MJD 59709.25513889 TDT (2022 May 10.2551) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#972022Apr14,8.59,2022,5,10,6.123926,0.055548,0.407279,-9.223035,1.258789,0.001067,0.002374,0.000001,-0.000001 -103.6684,-42.9139,87.26,17.63,False TYC 7813-01007-1,14.39073936,-42.8116469,0.00,9.80,0.00,0.0,0,,14.41445845,-42.9139329,3.67,0.00,0,0,0 247,Eukrate,13.44,141.7,2.4802,0,0,-2.976,4.47,,7.0 0,173.4179,2022,5,10,55.3243,0.0525,24.9572,0.24578,2.74041,2.06686,8.25,5.0,0.15 1.153,0.0243,0.0023,127,0.0120,Known errors,-1.00,-1,-1,-1 20220510_1007-1,59684.83 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Apr 15, 19:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org