IOTA/IOTA-ES occultation update for (342) Endymion / TYC 5773-00022-1 event on 2023 May 13, 20:54 UT Visible from Australia Summary ------- On 2023 May 13 UT, the 59.9 km diameter asteroid (342) Endymion will occult a 10.0 mag star in the constellation Aquarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.78 mag to 15.74 mag (the magnitude of the asteroid) for at most 3.810 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: 96 * date and approx. time of event: 2023 May 13, 20:47 - 2023 May 13, 21:01 * geocentric midpoint of event [JD]: 2460078.37117946 * magnitude of target star: 9.97 * magnitude drop [mag]: 5.78 * estimated maximum duration [s]: 3.810 * Moon: 35 % sunlit, 22° distance * Sun: 92° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 61 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.012", 71°) * approx speed of asteroid's shadow [km/s]: 15.7169 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5773-00022-1 by 342 Endymion on 2023 May 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 ' " Latitude Latitude Latitude Latitude 41 0 0 -42 52 2 20 47 51.8 0 100 -65 -43 8 48 -42 35 18 -43 22 24 -42 21 44 .... 42 0 0 -42 59 43 20 47 51.9 1 99 -65 -43 16 26 -42 43 0 -43 30 1 -42 29 27 0.18 43 0 0 -43 6 56 20 47 52.0 2 99 -65 -43 23 39 -42 50 15 -43 37 12 -42 36 44 0.18 44 0 0 -43 13 44 20 47 52.2 2 98 -65 -43 30 25 -42 57 4 -43 43 57 -42 43 34 0.18 45 0 0 -43 20 5 20 47 52.5 3 97 -65 -43 36 45 -43 3 27 -43 50 16 -42 49 58 0.19 46 0 0 -43 26 1 20 47 52.8 4 97 -65 -43 42 39 -43 9 24 -43 56 9 -42 55 56 0.19 47 0 0 -43 31 30 20 47 53.2 5 96 -65 -43 48 7 -43 14 55 -44 1 36 -43 1 28 0.19 48 0 0 -43 36 34 20 47 53.6 5 95 -65 -43 53 10 -43 20 0 -44 6 38 -43 6 34 0.19 49 0 0 -43 41 12 20 47 54.2 6 95 -65 -43 57 47 -43 24 39 -44 11 14 -43 11 13 0.19 50 0 0 -43 45 25 20 47 54.8 7 94 -65 -44 1 58 -43 28 52 -44 15 24 -43 15 28 0.19 51 0 0 -43 49 11 20 47 55.4 8 93 -64 -44 5 44 -43 32 39 -44 19 9 -43 19 16 0.19 52 0 0 -43 52 32 20 47 56.1 8 93 -64 -44 9 4 -43 36 1 -44 22 29 -43 22 38 0.19 53 0 0 -43 55 28 20 47 56.9 9 92 -64 -44 11 59 -43 38 58 -44 25 23 -43 25 35 0.19 54 0 0 -43 57 58 20 47 57.8 10 91 -64 -44 14 28 -43 41 28 -44 27 52 -43 28 6 0.19 55 0 0 -44 0 3 20 47 58.7 10 90 -64 -44 16 33 -43 43 33 -44 29 56 -43 30 12 0.19 56 0 0 -44 1 42 20 47 59.7 11 90 -63 -44 18 11 -43 45 13 -44 31 35 -43 31 52 0.19 57 0 0 -44 2 56 20 48 0.7 12 89 -63 -44 19 25 -43 46 27 -44 32 48 -43 33 6 0.19 58 0 0 -44 3 44 20 48 1.8 13 88 -63 -44 20 13 -43 47 16 -44 33 36 -43 33 55 0.19 59 0 0 -44 4 7 20 48 3.0 13 88 -63 -44 20 36 -43 47 39 -44 33 58 -43 34 18 0.19 60 0 0 -44 4 4 20 48 4.2 14 87 -62 -44 20 33 -43 47 36 -44 33 56 -43 34 16 0.19 61 0 0 -44 3 36 20 48 5.5 15 86 -62 -44 20 5 -43 47 8 -44 33 28 -43 33 47 0.19 62 0 0 -44 2 43 20 48 6.9 15 86 -62 -44 19 12 -43 46 15 -44 32 35 -43 32 54 0.19 63 0 0 -44 1 24 20 48 8.3 16 85 -61 -44 17 53 -43 44 55 -44 31 16 -43 31 34 0.19 64 0 0 -43 59 39 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4 52 28 20 58 49.3 48 253 40 4 33 20 5 11 34 4 17 48 5 27 3 0.20 176 0 0 5 26 52 20 58 55.5 47 253 41 5 7 48 5 45 54 4 52 19 6 1 20 0.20 177 0 0 6 0 45 20 59 1.6 46 253 42 5 41 45 6 19 44 5 26 19 6 35 7 0.21 178 0 0 6 34 8 20 59 7.5 45 253 43 6 15 12 6 53 3 5 59 49 7 8 22 0.21 179 0 0 7 6 59 20 59 13.3 44 253 45 6 48 7 7 25 50 6 32 48 7 41 7 0.21 180 0 0 7 39 19 20 59 19.0 43 252 46 7 20 30 7 58 6 7 5 14 8 13 19 0.21 -179 0 0 8 11 6 20 59 24.5 41 252 47 7 52 21 8 29 49 7 37 8 8 44 59 0.21 -178 0 0 8 42 20 20 59 29.8 40 252 48 8 23 39 9 0 59 8 8 29 9 16 5 0.21 -177 0 0 9 13 0 20 59 35.1 39 252 49 8 54 24 9 31 35 8 39 17 9 46 39 0.21 -176 0 0 9 43 7 20 59 40.1 38 252 50 9 24 34 10 1 38 9 9 31 10 16 38 0.21 -175 0 0 10 12 39 20 59 45.0 37 252 51 9 54 11 10 31 7 9 39 11 10 46 4 0.21 -174 0 0 10 41 37 20 59 49.8 36 253 52 10 23 13 11 0 1 10 8 16 11 14 55 0.21 -173 0 0 11 10 1 20 59 54.4 35 253 53 10 51 40 11 28 20 10 36 46 11 43 11 0.21 -172 0 0 11 37 49 20 59 58.8 34 253 55 11 19 32 11 56 4 11 4 42 12 10 52 0.21 -171 0 0 12 5 2 21 0 3.1 33 253 56 11 46 49 12 23 13 11 32 2 12 37 58 0.21 -170 0 0 12 31 39 21 0 7.3 32 253 57 12 13 30 12 49 47 11 58 46 13 4 28 0.21 -169 0 0 12 57 41 21 0 11.3 30 253 58 12 39 36 13 15 45 12 24 55 13 30 23 0.21 -168 0 0 13 23 7 21 0 15.2 29 253 59 13 5 6 13 41 8 12 50 28 13 55 43 0.21 -167 0 0 13 47 58 21 0 18.9 28 253 60 13 30 0 14 5 54 13 15 25 14 20 27 0.21 -166 0 0 14 12 12 21 0 22.5 27 254 61 13 54 18 14 30 5 13 39 46 14 44 34 0.21 -165 0 0 14 35 51 21 0 25.9 26 254 62 14 18 1 14 53 40 14 3 32 15 8 7 0.21 -164 0 0 14 58 54 21 0 29.2 25 254 63 14 41 7 15 16 39 14 26 41 15 31 3 0.21 -163 0 0 15 21 20 21 0 32.3 24 254 64 15 3 37 15 39 3 14 49 14 15 53 23 0.21 -162 0 0 15 43 11 21 0 35.3 23 255 65 15 25 31 16 0 50 15 11 11 16 15 8 0.21 -161 0 0 16 4 26 21 0 38.2 22 255 66 15 46 50 16 22 2 15 32 32 16 36 17 0.21 -160 0 0 16 25 5 21 0 40.9 21 255 67 16 7 32 16 42 37 15 53 17 16 56 50 0.21 -159 0 0 16 45 8 21 0 43.5 20 255 68 16 27 38 17 2 37 16 13 26 17 16 47 0.21 -158 0 0 17 4 36 21 0 45.9 19 256 69 16 47 9 17 22 2 16 32 59 17 36 9 0.21 -157 0 0 17 23 28 21 0 48.2 18 256 70 17 6 4 17 40 50 16 51 56 17 54 55 0.21 -156 0 0 17 41 44 21 0 50.4 17 256 71 17 24 23 17 59 3 17 10 18 18 13 6 0.21 -155 0 0 17 59 24 21 0 52.5 16 256 72 17 42 7 18 16 41 17 28 4 18 30 41 0.21 -154 0 0 18 16 30 21 0 54.4 15 257 73 17 59 15 18 33 44 17 45 15 18 47 41 0.21 -153 0 0 18 33 0 21 0 56.2 14 257 74 18 15 48 18 50 11 18 1 50 19 4 7 0.21 -152 0 0 18 48 55 21 0 57.8 13 257 75 18 31 45 19 6 3 18 17 50 19 19 57 0.21 -151 0 0 19 4 15 21 0 59.4 12 258 76 18 47 8 19 21 21 18 33 14 19 35 12 0.21 -150 0 0 19 19 0 21 1 0.8 11 258 77 19 1 56 19 36 3 18 48 4 19 49 53 0.21 -149 0 0 19 33 10 21 1 2.0 10 258 78 19 16 8 19 50 11 19 2 19 20 3 59 0.21 -148 0 0 19 46 46 21 1 3.2 9 259 79 19 29 47 20 3 45 19 15 59 20 17 30 0.22 -147 0 0 19 59 47 21 1 4.2 8 259 80 19 42 50 20 16 44 19 29 4 20 30 27 0.22 -146 0 0 20 12 14 21 1 5.2 7 259 80 19 55 19 20 29 9 19 41 35 20 42 50 0.22 -145 0 0 20 24 7 21 1 6.0 6 260 81 20 7 14 20 40 59 19 53 32 20 54 40 0.22 -144 0 0 20 35 26 21 1 6.6 5 260 82 20 18 35 20 52 16 20 4 54 21 5 55 0.23 -143 0 0 20 46 11 21 1 7.2 4 260 83 20 29 21 21 2 59 20 15 42 21 16 36 0.23 -142 0 0 20 56 22 21 1 7.7 3 261 84 20 39 34 21 13 8 20 25 56 21 26 44 0.24 -141 0 0 21 5 59 21 1 8.0 2 261 85 20 49 13 21 22 44 20 35 37 21 36 18 0.26 -140 0 0 21 15 3 21 1 8.2 1 261 85 20 58 19 21 31 46 20 44 43 21 45 19 0.30 -139 0 0 21 23 33 21 1 8.3 0 262 86 21 6 51 21 40 15 20 53 17 21 53 47 0.50 Uncertainty in time = +/- 2 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 5773-00022-1 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 23 04.5909 DE: -07 36 47.769 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 23 04.5909 DE: -07 36 47.769 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (342) Endymion asteroid class: approx. diameter [km]: 60 approx. diameter ["]: 0.031 distance from Earth [AU]: 2.65360 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#65 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): 0.017", 0.012", 71.489° remarks: * orbital elements for (342)Endymion : Mean anomaly = 208.8926587404 deg Arg. of pericenter = 224.8812313657 deg Long. of node = 232.6529936077 deg Inclination = 7.3539348731 deg Eccentricity = 0.1302451227 Semimajor axis = 2.5672909342 AU Perihelion dist = 2.2329138116 AU Mag: H = 10.24, G = 0.15 Epoch of elements : MJD 60077.87118056 TDT (2023 May 13.8712) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#652023Apr24,3.81,2023,5,13,20.908307,0.100141,-0.158024,7.497738,4.741236,-0.005365,-0.001778,0.000000,0.000000 136.0997,-7.5152,-134.53,18.48,False TYC 5773-00022-1,21.38460856,-7.6132692,0.00,9.97,0.00,0.0,0,,21.40514763,-7.5151508,5.77,0.00,0,0,0 342,Endymion,15.74,59.9,2.6536,0,0,1.671,15.71,,3.4,0 0,208.6839,2023,5,13,224.8812,232.6530,7.3539,0.13025,2.56729,2.23291,10.31,5.0,0.15 1.405,0.0167,0.0123,71,0.0126,Known errors,-1.00,-1,-1,-1 20230513_0022-1,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org