IOTA/IOTA-ES occultation update for (617) Patroclus / UCAC4-234-166356 event on 2022 May 26, 11:48 UT Visible from New Zealand Summary ------- On 2022 May 26 UT, the 131 km diameter asteroid (617) Patroclus will occult a 12.5 mag star in the constellation Corona Australis for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.93 mag to 15.34 mag (the magnitude of the asteroid) for at most 9.400 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: 80 * date and approx. time of event: 2022 May 26, 11:40 - 2022 May 26, 11:55 * geocentric midpoint of event [JD]: 2459725.99184167 * magnitude of target star: 12.49 * magnitude drop [mag]: 2.93 * estimated maximum duration [s]: 9.400 * Moon: 15 % sunlit, 99° distance * Sun: 141° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 133 * 1 sigma uncertainty interval [path widths]: +/- 0.67 * 1 sigma uncertainty interval [seconds]: +/- 5.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.037, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.037", 0.003", 98°) * approx speed of asteroid's shadow [km/s]: 13.9798 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-234-166356 by 617 Patroclus #1 on 2022 May 26 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 .. .. .. 36 0 0 .. .. .... .. .. .. - 91 0 8 ... .. .. - 92 10 37 ... .. .. .... - 90 53 59 35 0 0 11 40 45.5 1 212 8 - 91 45 48 - 90 2 2 - 92 55 18 - 88 51 57 .... - 91 39 30 34 0 0 11 40 45.8 2 212 7 - 92 30 36 - 90 48 16 - 93 39 10 - 89 39 12 -0.07 - 92 24 9 33 0 0 11 40 46.2 3 211 6 - 93 14 35 - 91 33 37 - 94 22 16 - 90 25 29 -0.11 - 93 8 1 32 0 0 11 40 46.9 5 211 5 - 93 57 49 - 92 18 7 - 95 4 40 - 91 10 52 -0.14 - 93 51 9 31 0 0 11 40 47.7 6 210 4 - 94 40 22 - 93 1 52 - 95 46 25 - 91 55 26 -0.15 - 94 33 37 30 0 0 11 40 48.8 7 210 3 - 95 22 16 - 93 44 54 - 96 27 36 - 92 39 15 -0.16 - 95 15 28 29 0 0 11 40 50.0 8 210 2 - 96 3 36 - 94 27 16 - 97 8 14 - 93 22 22 -0.16 - 95 56 45 28 0 0 11 40 51.4 9 209 1 - 96 44 23 - 95 9 3 - 97 48 22 - 94 4 51 -0.17 - 96 37 31 27 0 0 11 40 53.0 10 209 1 - 97 24 41 - 95 50 18 - 98 28 4 - 94 46 43 -0.17 - 97 17 48 26 0 0 11 40 54.7 12 209 0 - 98 4 33 - 96 31 2 - 99 7 22 - 95 28 4 -0.17 - 97 57 40 25 0 0 11 40 56.7 13 209 -1 - 98 44 1 - 97 11 18 - 99 46 17 - 96 8 54 -0.18 - 98 37 8 24 0 0 11 40 58.9 14 208 -2 - 99 23 6 - 97 51 10 -100 24 53 - 96 49 17 -0.18 - 99 16 16 23 0 0 11 41 1.2 15 208 -3 -100 1 53 - 98 30 38 -101 3 12 - 97 29 16 -0.18 - 99 55 4 22 0 0 11 41 3.7 16 208 -4 -100 40 22 - 99 9 47 -101 41 15 - 98 8 52 -0.18 -100 33 36 21 0 0 11 41 6.4 17 207 -5 -101 18 35 - 99 48 38 -102 19 5 - 98 48 8 -0.18 -101 11 54 20 0 0 11 41 9.2 19 207 -6 -101 56 36 -100 27 12 -102 56 43 - 99 27 6 -0.18 -101 49 58 19 0 0 11 41 12.3 20 207 -7 -102 34 25 -101 5 32 -103 34 12 -100 5 49 -0.18 -102 27 52 18 0 0 11 41 15.5 21 207 -8 -103 12 4 -101 43 40 -104 11 33 -100 44 17 -0.19 -103 5 36 17 0 0 11 41 18.9 22 207 -9 -103 49 35 -102 21 38 -104 48 47 -101 22 33 -0.19 -103 43 13 16 0 0 11 41 22.5 23 206 -10 -104 27 1 -102 59 28 -105 25 58 -102 0 40 -0.19 -104 20 45 15 0 0 11 41 26.2 24 206 -11 -105 4 22 -103 37 10 -106 3 5 -102 38 37 -0.19 -104 58 13 14 0 0 11 41 30.1 25 206 -12 -105 41 41 -104 14 48 -106 40 12 -103 16 29 -0.19 -105 35 39 13 0 0 11 41 34.2 27 206 -13 -106 18 58 -104 52 22 -107 17 18 -103 54 15 -0.19 -106 13 4 12 0 0 11 41 38.5 28 206 -14 -106 56 16 -105 29 55 -107 54 27 -104 31 58 -0.19 -106 50 30 11 0 0 11 41 42.9 29 205 -15 -107 33 36 -106 7 27 -108 31 40 -105 9 39 -0.19 -107 27 59 10 0 0 11 41 47.5 30 205 -16 -108 11 0 -106 45 1 -109 8 58 -105 47 21 -0.19 -108 5 31 9 0 0 11 41 52.3 31 205 -17 -108 48 29 -107 22 38 -109 46 22 -106 25 4 -0.19 -108 43 10 8 0 0 11 41 57.3 32 205 -18 -109 26 5 -108 0 19 -110 23 55 -107 2 50 -0.19 -109 20 56 7 0 0 11 42 2.4 34 205 -19 -110 3 49 -108 38 7 -111 1 37 -107 40 41 -0.19 -109 58 50 6 0 0 11 42 7.6 35 205 -20 -110 41 43 -109 16 3 -111 39 31 -108 18 38 -0.19 -110 36 56 5 0 0 11 42 13.1 36 204 -21 -111 19 49 -109 54 8 -112 17 39 -108 56 43 -0.19 -111 15 13 4 0 0 11 42 18.7 37 204 -22 -111 58 8 -110 32 23 -112 56 0 -109 34 57 -0.19 -111 53 44 3 0 0 11 42 24.4 38 204 -23 -112 36 41 -111 10 52 -113 34 38 -110 13 23 -0.19 -112 32 30 2 0 0 11 42 30.4 39 204 -24 -113 15 31 -111 49 34 -114 13 34 -110 52 1 -0.19 -113 11 33 1 0 0 11 42 36.4 41 204 -24 -113 54 39 -112 28 33 -114 52 49 -111 30 54 -0.19 -113 50 54 0 0 0 11 42 42.7 42 204 -25 -114 34 7 -113 7 49 -115 32 26 -112 10 3 -0.19 -114 30 36 - 1 0 0 11 42 49.1 43 203 -26 -115 13 57 -113 47 24 -116 12 26 -112 49 29 -0.19 Latitude Latitude Latitude Latitude -116 0 0 - 3 13 2 11 43 3.9 45 203 -29 - 2 8 40 - 4 17 0 - 0 41 25 - 5 42 25 -0.19 -117 0 0 - 4 40 36 11 43 14.0 47 203 -30 - 3 36 53 - 5 43 55 - 2 10 33 - 7 8 29 -0.19 -118 0 0 - 6 6 41 11 43 24.3 49 203 -31 - 5 3 38 - 7 9 21 - 3 38 13 - 8 33 3 -0.19 -119 0 0 - 7 31 12 11 43 34.7 50 202 -33 - 6 28 50 - 8 33 12 - 5 4 22 - 9 56 3 -0.19 -120 0 0 - 8 54 7 11 43 45.2 52 202 -34 - 7 52 26 - 9 55 27 - 6 28 54 -11 17 24 -0.19 -121 0 0 -10 15 21 11 43 55.8 54 202 -36 - 9 14 22 -11 16 1 - 7 51 47 -12 37 5 -0.19 -122 0 0 -11 34 53 11 44 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24 8 -0.19 119 0 0 -36 1 54 11 55 22.0 17 131 -35 -35 16 18 -36 47 21 -34 14 45 -37 48 15 -0.19 118 0 0 -35 23 36 11 55 24.4 16 132 -34 -34 37 30 -36 9 32 -33 35 17 -37 11 4 -0.19 117 0 0 -34 43 54 11 55 26.8 15 132 -33 -33 57 19 -35 30 20 -32 54 24 -36 32 33 -0.19 116 0 0 -34 2 47 11 55 29.0 14 133 -32 -33 15 40 -34 49 45 -32 12 3 -35 52 38 -0.19 115 0 0 -33 20 13 11 55 31.1 13 133 -31 -32 32 34 -34 7 42 -31 28 12 -35 11 18 -0.19 114 0 0 -32 36 8 11 55 33.1 12 134 -31 -31 47 56 -33 24 10 -30 42 48 -34 28 30 -0.19 113 0 0 -31 50 31 11 55 35.0 11 134 -30 -31 1 44 -32 39 7 -29 55 50 -33 44 11 -0.19 112 0 0 -31 3 17 11 55 36.7 10 135 -29 -30 13 55 -31 52 28 -29 7 13 -32 58 19 -0.19 111 0 0 -30 14 26 11 55 38.2 9 135 -28 -29 24 27 -31 4 13 -28 16 55 -32 10 52 -0.19 110 0 0 -29 23 54 11 55 39.6 7 136 -27 -28 33 17 -30 14 18 -27 24 53 -31 21 46 -0.19 109 0 0 -28 31 38 11 55 40.8 6 136 -26 -27 40 23 -29 22 40 -26 31 6 -30 30 59 -0.19 108 0 0 -27 37 35 11 55 41.9 5 137 -25 -26 45 40 -28 29 17 -25 35 29 -29 38 27 -0.19 107 0 0 -26 41 44 11 55 42.7 4 137 -24 -25 49 8 -27 34 6 -24 38 1 -28 44 10 -0.19 106 0 0 -25 44 1 11 55 43.3 2 138 -23 -24 50 43 -26 37 4 -23 38 39 -27 48 3 -0.19 105 0 0 -24 44 24 11 55 43.6 1 138 -21 -23 50 23 -25 38 10 .. .. .. -26 50 4 -0.18 Uncertainty in time = +/- 8 secs Prediction of 2021 Jun 12.0 Data for the target star ------------------------ * name: UCAC4-234-166356 * constellation : Corona Australis * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 44 56.4746 DE: -43 13 27.025 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 44 56.4746 DE: -43 13 27.025 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (617) Patroclus asteroid class: asteroid system: multiple bodies approx. diameter [km]: 131 approx. diameter ["]: 0.044 distance from Earth [AU]: 4.13840 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#82 date of fit: 2021 Apr 23 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): 0.037", 0.003", 97.8° remarks: * orbital elements for (617)Patroclus : Mean anomaly = 296.9036690867 deg Arg. of pericenter = 308.1315992406 deg Long. of node = 44.3567477403 deg Inclination = 22.0615556892 deg Eccentricity = 0.1398399393 Semimajor axis = 5.2106735728 AU Perihelion dist = 4.4820132968 AU Mag: H = 8.24, G = 0.15 Epoch of elements : MJD 59725.49180556 TDT (2022 May 26.4918) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#822021Apr23 Binary solution 1 : Kepler,9.37,2022,5,26,11.8042,-0.118415,0.123381,-5.727690,-5.427217,-0.003398,0.001383,0.000001,0.000000 -139.4539,-43.1998,2.21,21.17,False UCAC4-234-166356,18.74902073,-43.2241735,0.00,12.49,0.00,0.0,0,,18.77590056,-43.1997613 617,Patroclus #1,15.34,131.0,4.1384,0,1,-1.113,-11.53,,10.0 Menoetius,98,680,4.283000,0.0200,,,,, 0,296.8629,2022,5,26,308.1316,44.3567,22.0616,0.13984,5.21067,4.48201,8.24,5.0,0.15 1.672,0.0375,0.0034,98,0.0289,Known errors + binary orbit,-1.00,-1,-1,-1 20220526_166356_Ma1,59377.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2021 Jun 12, 04:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org