IOTA/IOTA-ES occultation update for (15) Eunomia / TYC 6893-00021-1 event on 2023 May 29, 10:29 UT Visible from Hawaii Summary ------- On 2023 May 29 UT, the 248.3 km diameter asteroid (15) Eunomia will occult a 9.8 mag star in the constellation Sagittarius for observers along a path across Hawaii. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.81 mag to 9.87 mag (the magnitude of the asteroid) for at most 58.210 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 May 29, 10:05 - 2023 May 29, 10:53 * geocentric midpoint of event [JD]: 2460093.93723284 * magnitude of target star: 9.75 * magnitude drop [mag]: 0.81 * estimated maximum duration [s]: 58.210 * Moon: 68 % sunlit, 114° distance * Sun: 135° distance * rough path description: Hawaii The occultation path -------------------- * approximate projected width [km]: 273 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 7.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.015) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.013", 69°) * approx speed of asteroid's shadow [km/s]: 4.2654 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6893-00021-1 by 15 Eunomia on 2023 May 29 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 176 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 36 14 23 .... 177 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 36 1 32 .. .. .. 35 42 26 .... 178 0 0 36 59 34 10 52 13.2 1 124 -29 38 31 16 35 29 15 .. .. .. 35 10 8 .... 179 0 0 36 27 4 10 52 12.5 2 125 -30 37 58 55 34 56 38 38 18 44 34 37 29 -0.28 -180 0 0 35 54 14 10 52 11.4 3 125 -31 37 26 12 34 23 41 37 46 2 34 4 31 -0.36 -179 0 0 35 21 4 10 52 9.8 4 126 -31 36 53 8 33 50 26 37 13 0 33 31 14 -0.40 -178 0 0 34 47 36 10 52 7.7 5 127 -32 36 19 45 33 16 53 36 39 38 32 57 40 -0.42 -177 0 0 34 13 49 10 52 5.1 6 127 -33 35 46 3 32 43 3 36 5 57 32 23 49 -0.44 -176 0 0 33 39 46 10 52 2.0 7 128 -34 35 12 3 32 8 57 35 31 58 31 49 43 -0.45 -175 0 0 33 5 28 10 51 58.4 8 128 -34 34 37 47 31 34 36 34 57 42 31 15 21 -0.46 -174 0 0 32 30 54 10 51 54.3 9 129 -35 34 3 15 31 0 1 34 23 11 30 40 47 -0.46 -173 0 0 31 56 7 10 51 49.6 10 129 -36 33 28 28 30 25 14 33 48 24 30 5 59 -0.47 -172 0 0 31 21 8 10 51 44.5 11 130 -37 32 53 28 29 50 15 33 13 25 29 31 1 -0.47 -171 0 0 30 45 57 10 51 38.7 12 130 -37 32 18 16 29 15 6 32 38 12 28 55 52 -0.48 -170 0 0 30 10 36 10 51 32.5 13 131 -38 31 42 53 28 39 47 32 2 48 28 20 34 -0.48 -169 0 0 29 35 6 10 51 25.7 14 131 -39 31 7 20 28 4 20 31 27 14 27 45 8 -0.48 -168 0 0 28 59 28 10 51 18.4 15 132 -39 30 31 38 27 28 47 30 51 32 27 9 34 -0.48 -167 0 0 28 23 43 10 51 10.5 16 132 -40 29 55 48 26 53 7 30 15 41 26 33 56 -0.49 -166 0 0 27 47 53 10 51 2.1 17 133 -41 29 19 52 26 17 22 29 39 43 25 58 12 -0.49 -165 0 0 27 11 58 10 50 53.1 18 133 -41 28 43 51 25 41 34 29 3 41 25 22 25 -0.49 -164 0 0 26 36 0 10 50 43.6 19 134 -42 28 7 45 25 5 43 28 27 34 24 46 36 -0.49 -163 0 0 26 0 0 10 50 33.6 20 134 -43 27 31 37 24 29 51 27 51 24 24 10 45 -0.49 -162 0 0 25 23 59 10 50 23.1 21 135 -43 26 55 27 23 53 58 27 15 12 23 34 55 -0.49 -161 0 0 24 47 58 10 50 12.0 22 135 -44 26 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Uncertainty in time = +/- 8 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 6893-00021-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 37 34.5334 DE: -26 14 49.480 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 37 34.5335 DE: -26 14 49.480 * position source: Gaia DR3 * 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: (15) Eunomia asteroid class: ShapeModel approx. diameter [km]: 248 approx. diameter ["]: 0.175 distance from Earth [AU]: 1.95370 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#93 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): 0.025", 0.013", 68.767° remarks: * orbital elements for (15)Eunomia : Mean anomaly = 265.5585822312 deg Arg. of pericenter = 98.7348059509 deg Long. of node = 292.9067538768 deg Inclination = 11.7542119952 deg Eccentricity = 0.1870473731 Semimajor axis = 2.6428744254 AU Perihelion dist = 2.1485317067 AU Mag: H = 5.38, G = 0.23 Epoch of elements : MJD 60093.43715278 TDT (2023 May 29.4372) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#932023Apr24,58.21,2023,5,29,10.493588,0.127776,0.396753,-2.291423,0.738553,-0.003868,-0.000329,0.000001,0.000000 -109.3456,-26.1942,21.95,21.61,False TYC 6893-00021-1,19.62625927,-26.2470777,0.00,9.75,0.00,0.0,0,,19.65025794,-26.1942439,0.82,0.00,0,0,0 15,Eunomia,9.87,248.3,1.9537,0,0,-0.767,3.33,,14.4,0 0,265.4583,2023,5,29,98.7348,292.9068,11.7542,0.18705,2.64287,2.14853,5.38,5.0,0.15 1.107,0.0250,0.0130,69,0.0187,Known errors,-1.00,-1,-1,-1 20230529_0021-1,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org