IOTA/IOTA-ES occultation update for (181) Eucharis / UCAC4-447-061187 event on 2023 Feb 26, 11:26 UT Visible from W Canada, W USA Summary ------- On 2023 Feb 26 UT, the 113.3 km diameter asteroid (181) Eucharis will occult a 12.4 mag star in the constellation Serpens for observers along a path across W Canada, W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.80 mag to 13.98 mag (the magnitude of the asteroid) for at most 7.720 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 Feb 26, 11:22 - 2023 Feb 26, 11:30 * geocentric midpoint of event [JD]: 2460001.97663034 * magnitude of target star: 12.41 * magnitude drop [mag]: 1.80 * estimated maximum duration [s]: 7.720 * Moon: 42 % sunlit, 158° distance * Sun: 95° distance * rough path description: W Canada, W USA The occultation path -------------------- * approximate projected width [km]: 243 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.001", 105°) * approx speed of asteroid's shadow [km/s]: 14.6754 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-447-061187 by 181 Eucharis on 2023 Feb 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 .. .. .. 89 0 0 .. .. .... .. .. .. ... .. .. ... .. .. -108 39 38 ... .. .. .... .. .. .. 88 0 0 .. .. .... .. .. .. -110 12 13 ... .. .. - 96 58 0 ... .. .. .... -125 28 22 87 0 0 11 29 40.1 1 139 -11 -102 22 2 ... .. .. - 93 49 15 ... .. .. .... -115 17 57 86 0 0 11 29 39.4 3 149 -11 - 99 3 21 -135 22 30 - 92 42 36 -147 8 1 1.52 -110 7 39 85 0 0 11 29 38.5 4 154 -11 - 97 27 40 -124 28 3 - 92 24 13 -131 27 38 1.65 -107 8 6 84 0 0 11 29 37.2 5 157 -11 - 96 42 29 -118 30 23 - 92 29 55 -123 44 55 1.72 -105 18 50 83 0 0 11 29 35.7 6 159 -12 - 96 25 53 -114 48 30 - 92 49 20 -119 4 11 1.75 -104 12 5 82 0 0 11 29 33.8 7 160 -12 - 96 27 6 -112 23 6 - 93 17 24 -116 0 10 1.78 -103 33 9 81 0 0 11 29 31.8 8 161 -12 - 96 40 12 -110 45 46 - 93 51 16 -113 55 14 1.80 -103 13 31 80 0 0 11 29 29.4 9 161 -13 - 97 1 39 -109 40 56 - 94 29 14 -112 29 30 1.81 -103 7 49 79 0 0 11 29 26.8 10 161 -13 - 97 29 14 -108 59 13 - 95 10 15 -111 31 24 1.82 -103 12 34 78 0 0 11 29 23.9 11 161 -13 - 98 1 27 -108 34 32 - 95 53 37 -110 53 31 -1.83 -103 25 24 77 0 0 11 29 20.8 12 161 -14 - 98 37 18 -108 22 54 - 96 38 51 -110 31 0 -1.83 -103 44 37 76 0 0 11 29 17.3 12 160 -14 - 99 16 5 -108 21 27 - 97 25 37 -110 20 25 -1.84 -104 9 2 75 0 0 11 29 13.6 13 160 -15 - 99 57 17 -108 28 12 - 98 13 41 -110 19 25 -1.84 -104 37 42 74 0 0 11 29 9.7 14 159 -15 -100 40 32 -108 41 39 - 99 2 54 -110 26 12 -1.85 -105 9 59 73 0 0 11 29 5.5 15 158 -16 -101 25 32 -109 0 39 - 99 53 7 -110 39 26 -1.85 -105 45 20 72 0 0 11 29 1.0 16 158 -16 -102 12 5 -109 24 23 -100 44 16 -110 58 7 -1.86 -106 23 22 71 0 0 11 28 56.3 17 157 -17 -103 0 1 -109 52 10 -101 36 16 -111 21 28 -1.86 -107 3 47 70 0 0 11 28 51.3 18 156 -18 -103 49 14 -110 23 29 -102 29 6 -111 48 51 -1.86 -107 46 19 69 0 0 11 28 46.0 18 155 -18 -104 39 37 -110 57 56 -103 22 44 -112 19 49 -1.86 -108 30 48 68 0 0 11 28 40.5 19 154 -19 -105 31 7 -111 35 12 -104 17 8 -112 53 59 -1.87 -109 17 5 67 0 0 11 28 34.7 20 153 -20 -106 23 42 -112 15 0 -105 12 19 -113 31 1 -1.87 -110 5 2 66 0 0 11 28 28.7 21 152 -20 -107 17 20 -112 57 10 -106 8 17 -114 10 42 -1.87 -110 54 36 65 0 0 11 28 22.4 21 151 -21 -108 11 59 -113 41 31 -107 5 4 -114 52 50 -1.87 -111 45 42 64 0 0 11 28 15.9 22 150 -22 -109 7 41 -114 27 57 -108 2 39 -115 37 16 -1.88 -112 38 18 63 0 0 11 28 9.1 23 149 -23 -110 4 25 -115 16 21 -109 1 6 -116 23 54 -1.88 -113 32 23 62 0 0 11 28 2.1 23 148 -23 -111 2 13 -116 6 40 -110 0 27 -117 12 37 -1.88 -114 27 55 61 0 0 11 27 54.8 24 146 -24 -112 1 5 -116 58 51 -111 0 42 -118 3 23 -1.88 -115 24 55 60 0 0 11 27 47.3 25 145 -25 -113 1 4 -117 52 52 -112 1 56 -118 56 9 -1.89 -116 23 25 59 0 0 11 27 39.6 25 144 -26 -114 2 13 -118 48 44 -113 4 12 -119 50 54 -1.89 -117 23 27 58 0 0 11 27 31.6 26 142 -27 -115 4 34 -119 46 27 -114 7 32 -120 47 40 -1.89 -118 25 2 57 0 0 11 27 23.4 26 141 -28 -116 8 12 -120 46 3 -115 12 2 -121 46 27 -1.89 -119 28 16 56 0 0 11 27 14.9 26 139 -29 -117 13 10 -121 47 35 -116 17 45 -122 47 18 -1.90 -120 33 11 55 0 0 11 27 6.2 27 138 -30 -118 19 33 -122 51 7 -117 24 46 -123 50 17 -1.90 -121 39 53 54 0 0 11 26 57.3 27 136 -31 -119 27 27 -123 56 44 -118 33 12 -124 55 29 -1.90 -122 48 29 53 0 0 11 26 48.1 27 135 -32 -120 36 59 -125 4 32 -119 43 9 -126 2 59 -1.91 -123 59 6 52 0 0 11 26 38.8 27 133 -34 -121 48 14 -126 14 39 -120 54 43 -127 12 58 -1.91 -125 11 51 51 0 0 11 26 29.2 28 132 -35 -123 1 22 -127 27 15 -122 8 3 -128 25 33 -1.91 -126 26 56 50 0 0 11 26 19.3 28 130 -36 -124 16 31 -128 42 30 -123 23 17 -129 40 57 -1.92 -127 44 33 49 0 0 11 26 9.3 27 128 -37 -125 33 52 -130 0 37 -124 40 36 -130 59 23 -1.92 -129 4 53 48 0 0 11 25 59.0 27 127 -39 -126 53 38 -131 21 52 -126 0 12 -132 21 9 -1.92 -130 28 14 47 0 0 11 25 48.6 27 125 -40 -128 16 1 -132 46 35 -127 22 17 -133 46 35 -1.93 -131 54 55 46 0 0 11 25 37.9 27 123 -42 -129 41 19 -134 15 8 -128 47 7 -135 16 5 -1.93 -133 25 19 45 0 0 11 25 27.0 26 121 -43 -131 9 52 -135 47 59 -130 15 2 -136 50 11 -1.94 -134 59 55 44 0 0 11 25 15.9 26 119 -45 -132 42 4 -137 25 44 -131 46 23 -138 29 33 -1.94 -136 39 18 43 0 0 11 25 4.6 25 117 -46 -134 18 22 -139 9 9 -133 21 37 -140 15 0 -1.95 -138 24 12 42 0 0 11 24 53.1 25 116 -48 -135 59 21 -140 59 10 -135 1 15 -142 7 39 -1.96 -140 15 34 41 0 0 11 24 41.3 24 114 -50 -137 45 47 -142 57 6 -136 45 58 -144 9 0 -1.97 -142 14 41 40 0 0 11 24 29.4 23 112 -51 -139 38 36 -145 4 44 -138 36 36 -146 21 10 -1.98 -144 23 17 39 0 0 11 24 17.2 21 110 -53 -141 39 2 -147 24 41 -140 34 17 -148 47 20 -1.99 Latitude Latitude Latitude Latitude -145 0 0 38 43 46 11 24 13.9 21 109 -54 37 29 8 40 2 8 36 58 52 40 36 11 -1.95 -146 0 0 38 18 6 11 24 8.6 21 108 -55 37 4 13 39 35 35 36 34 15 40 9 14 -1.96 -147 0 0 37 53 29 11 24 3.5 20 107 -55 36 40 19 39 10 9 36 10 38 39 43 25 -1.96 -148 0 0 37 29 55 11 23 58.6 19 107 -56 36 17 26 38 45 48 35 48 0 39 18 42 -1.97 -149 0 0 37 7 24 11 23 53.9 19 106 -57 35 55 33 38 22 33 35 26 22 38 55 7 -1.97 -150 0 0 36 45 55 11 23 49.3 18 105 -58 35 34 41 38 0 22 35 5 43 38 32 37 -1.97 -151 0 0 36 25 27 11 23 44.9 17 104 -58 35 14 47 37 39 16 34 46 3 38 11 13 -1.97 -152 0 0 36 6 2 11 23 40.8 16 103 -59 34 55 54 37 19 14 34 27 22 37 50 53 -1.98 -153 0 0 35 47 37 11 23 36.8 16 103 -60 34 37 59 37 0 15 34 9 39 37 31 38 -1.98 -154 0 0 35 30 13 11 23 33.0 15 102 -60 34 21 3 36 42 19 33 52 54 37 13 27 -1.98 -155 0 0 35 13 49 11 23 29.4 14 101 -61 34 5 6 36 25 25 33 37 7 36 56 20 -1.98 -156 0 0 34 58 26 11 23 26.0 13 101 -62 33 50 8 36 9 34 33 22 18 36 40 16 -1.99 -157 0 0 34 44 2 11 23 22.8 13 100 -62 33 36 7 35 54 44 33 8 27 36 25 14 -1.99 -158 0 0 34 30 38 11 23 19.8 12 99 -63 33 23 5 35 40 56 32 55 32 36 11 15 -1.99 -159 0 0 34 18 13 11 23 17.0 11 99 -63 33 10 59 35 28 8 32 43 35 35 58 17 -2.00 -160 0 0 34 6 47 11 23 14.4 10 98 -64 32 59 52 35 16 22 32 32 34 35 46 21 -2.00 -161 0 0 33 56 20 11 23 12.0 9 97 -64 32 49 41 35 5 36 32 22 30 35 35 27 -2.01 -162 0 0 33 46 51 11 23 9.8 9 97 -64 32 40 27 34 55 49 32 13 22 35 25 33 -2.02 -163 0 0 33 38 20 11 23 7.8 8 96 -65 32 32 10 34 47 3 32 5 10 35 16 39 -2.03 -164 0 0 33 30 47 11 23 6.0 7 96 -65 32 24 49 34 39 16 31 57 54 35 8 46 -2.04 -165 0 0 33 24 11 11 23 4.4 6 95 -65 32 18 25 34 32 28 31 51 34 35 1 53 -2.05 -166 0 0 33 18 33 11 23 3.0 5 94 -65 32 12 57 34 26 40 31 46 10 34 55 59 -2.07 -167 0 0 33 13 52 11 23 1.8 5 94 -66 32 8 24 34 21 50 31 41 40 34 51 5 -2.10 -168 0 0 33 10 9 11 23 0.9 4 93 -66 32 4 47 34 17 58 31 38 6 34 47 10 -2.14 -169 0 0 33 7 22 11 23 0.1 3 93 -66 32 2 6 34 15 5 31 35 27 34 44 14 -2.20 -170 0 0 33 5 31 11 22 59.5 2 92 -66 32 0 20 34 13 10 31 33 42 34 42 17 -2.32 -171 0 0 33 4 38 11 22 59.1 1 92 -65 31 59 29 34 12 13 31 32 53 34 41 19 -2.61 -172 0 0 33 4 40 11 22 59.0 0 91 -65 31 59 33 34 12 14 31 32 57 34 41 19 -4.47 Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4-447-061187 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 14 25.4641 DE: -00 45 04.769 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 14 25.4641 DE: -00 45 04.769 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (181) Eucharis asteroid class: approx. diameter [km]: 113 approx. diameter ["]: 0.050 distance from Earth [AU]: 3.12850 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#93 date of fit: 2023 Feb 07 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): 0.015", 0.001", 104.5° remarks: * orbital elements for (181)Eucharis : Mean anomaly = 100.6096175612 deg Arg. of pericenter = 318.8349771429 deg Long. of node = 143.0100225768 deg Inclination = 18.8913332299 deg Eccentricity = 0.2075828493 Semimajor axis = 3.1262866098 AU Perihelion dist = 2.4773231277 AU Mag: H = 7.96, G = 0.15 Epoch of elements : MJD 60001.47659722 TDT (2023 Feb 26.4766) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#932023Feb07,7.72,2023,2,26,11.439128,-0.433851,0.770757,7.217391,4.064566,-0.005900,0.000904,0.000000,-0.000001 -83.7399,-0.8118,11.64,-8.72,False UCAC4-447-061187,16.24040667,-0.7513246,0.00,12.41,0.00,0.0,0,,16.26013616,-0.8118165,1.80,0.00,0,0,0 181,Eucharis,13.98,113.3,3.1285,0,0,1.353,11.43,,5.4,0 0,100.5246,2023,2,26,318.8350,143.0100,18.8913,0.20758,3.12629,2.47732,7.96,5.0,0.15 1.209,0.0150,0.0014,105,0.0104,Known errors,-1.00,-1,-1,-1 20230226_061187,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org