IOTA/IOTA-ES occultation update for (15) Eunomia / UCAC4 317-225674 event on 2023 May 12, 10:44 UT Visible from Canada, W USA, Hawaii Summary ------- On 2023 May 12 UT, the 248.3 km diameter asteroid (15) Eunomia will occult a 12.4 mag star in the constellation Sagittarius for observers along a path across Canada, W USA, Hawaii. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.13 mag to 10.24 mag (the magnitude of the asteroid) for at most 81.640 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: 100 * date and approx. time of event: 2023 May 12, 10:24 - 2023 May 12, 11:03 * geocentric midpoint of event [JD]: 2460076.94740029 * magnitude of target star: 12.44 * magnitude drop [mag]: 0.13 * estimated maximum duration [s]: 81.640 * Moon: 53 % sunlit, 26° distance * Sun: 119° distance * rough path description: Canada, W USA, Hawaii The occultation path -------------------- * approximate projected width [km]: 510 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 11.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.014) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.012", 68°) * approx speed of asteroid's shadow [km/s]: 3.0413 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 317-225674 by 15 Eunomia on 2023 May 12 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 .. .. .. 63 0 0 .. .. .... .. .. .. ... .. .. ... .. .. -112 10 18 ... .. .. .... -117 2 30 62 0 0 11 1 5.5 1 165 -1 -112 29 54 ... .. .. -111 48 19 ... .. .. .... -116 32 41 61 0 0 11 1 4.3 2 165 -2 -112 11 5 -121 19 36 -111 31 4 -122 8 33 0.98 -116 8 24 60 0 0 11 1 1.8 3 166 -2 -111 56 37 -120 43 14 -111 18 2 -121 29 57 1.25 -115 49 2 59 0 0 11 0 57.9 4 166 -3 -111 46 3 -120 13 12 -111 8 45 -120 57 57 1.36 -115 34 4 58 0 0 11 0 52.7 5 166 -3 -111 39 0 -119 48 44 -111 2 52 -120 31 45 1.42 -115 23 2 57 0 0 11 0 46.2 6 166 -4 -111 35 8 -119 29 14 -111 0 3 -120 10 43 1.46 -115 15 34 56 0 0 11 0 38.4 7 166 -5 -111 34 10 -119 14 11 -111 0 3 -119 54 19 1.48 -115 11 23 55 0 0 11 0 29.4 8 166 -5 -111 35 52 -119 3 9 -111 2 38 -119 42 5 1.50 -115 10 10 54 0 0 11 0 19.0 8 166 -6 -111 40 1 -118 55 47 -111 7 35 -119 33 38 1.51 -115 11 43 53 0 0 11 0 7.4 9 166 -7 -111 46 27 -118 51 47 -111 14 45 -119 28 40 -1.52 -115 15 50 52 0 0 10 59 54.6 10 166 -7 -111 55 0 -118 50 54 -111 23 58 -119 26 55 -1.53 -115 22 20 51 0 0 10 59 40.4 11 166 -8 -112 5 33 -118 52 55 -111 35 8 -119 28 8 -1.54 -115 31 6 50 0 0 10 59 25.0 12 166 -9 -112 17 58 -118 57 37 -111 48 7 -119 32 9 -1.55 -115 42 0 49 0 0 10 59 8.3 13 165 -10 -112 32 11 -119 4 52 -112 2 50 -119 38 47 -1.55 -115 54 56 48 0 0 10 58 50.3 14 165 -10 -112 48 7 -119 14 33 -112 19 13 -119 47 54 -1.56 -116 9 48 47 0 0 10 58 31.0 15 165 -11 -113 5 40 -119 26 32 -112 37 12 -119 59 24 -1.56 -116 26 33 46 0 0 10 58 10.4 16 164 -12 -113 24 49 -119 40 45 -112 56 44 -120 13 11 -1.57 -116 45 7 45 0 0 10 57 48.5 17 164 -13 -113 45 31 -119 57 6 -113 17 45 -120 29 11 -1.57 -117 5 28 44 0 0 10 57 25.2 18 163 -14 -114 7 43 -120 15 34 -113 40 15 -120 47 20 -1.58 -117 27 34 43 0 0 10 57 0.6 19 163 -15 -114 31 25 -120 36 5 -114 4 13 -121 7 37 -1.58 -117 51 24 42 0 0 10 56 34.6 19 162 -16 -114 56 35 -120 58 39 -114 29 36 -121 29 59 -1.59 -118 16 58 41 0 0 10 56 7.2 20 162 -17 -115 23 14 -121 23 16 -114 56 26 -121 54 28 -1.60 -118 44 16 40 0 0 10 55 38.4 21 161 -18 -115 51 21 -121 49 55 -115 24 42 -122 21 2 -1.60 -119 13 19 39 0 0 10 55 8.1 22 160 -19 -116 20 59 -122 18 39 -115 54 25 -122 49 45 -1.61 -119 44 9 38 0 0 10 54 36.4 23 160 -20 -116 52 7 -122 49 30 -116 25 38 -123 20 39 -1.62 -120 16 49 37 0 0 10 54 3.1 23 159 -21 -117 24 49 -123 22 33 -116 58 22 -123 53 48 -1.63 -120 51 23 36 0 0 10 53 28.3 24 158 -22 -117 59 7 -123 57 51 -117 32 39 -124 29 18 -1.64 -121 27 55 35 0 0 10 52 51.8 25 157 -23 -118 35 5 -124 35 33 -118 8 34 -125 7 14 -1.65 -122 6 32 34 0 0 10 52 13.7 25 156 -24 -119 12 48 -125 15 44 -118 46 11 -125 47 47 -1.66 -122 47 19 33 0 0 10 51 33.9 26 155 -26 -119 52 19 -125 58 37 -119 25 34 -126 31 7 -1.67 -123 30 26 32 0 0 10 50 52.3 27 154 -27 -120 33 47 -126 44 24 -120 6 49 -127 17 27 -1.68 -124 16 3 31 0 0 10 50 8.9 27 153 -28 -121 17 18 -127 33 19 -120 50 5 -128 7 4 -1.69 -125 4 23 30 0 0 10 49 23.4 28 152 -30 -122 3 2 -128 25 44 -121 35 29 -129 0 21 -1.70 -125 55 41 29 0 0 10 48 35.9 28 151 -31 -122 51 9 -129 22 2 -122 23 12 -129 57 42 -1.71 -126 50 16 28 0 0 10 47 46.1 28 149 -32 -123 41 52 -130 22 44 -123 13 26 -130 59 43 -1.73 -127 48 32 27 0 0 10 46 53.9 29 148 -34 -124 35 27 -131 28 32 -124 6 26 -132 7 10 -1.74 -128 50 58 26 0 0 10 45 59.1 29 147 -35 -125 32 12 -132 40 22 -125 2 29 -133 21 5 -1.76 -129 58 14 25 0 0 10 45 1.3 29 145 -37 -126 32 32 -133 59 28 -126 1 58 -134 42 55 -1.77 -131 11 9 24 0 0 10 44 0.3 29 144 -38 -127 36 55 -135 27 43 -127 5 19 -136 14 52 -1.79 -132 30 52 23 0 0 10 42 55.5 29 142 -40 -128 45 58 -137 7 58 -128 13 7 -138 0 25 -1.80 -133 59 2 22 0 0 10 41 46.1 29 140 -42 -130 0 31 -139 5 11 -129 26 7 -140 5 55 -1.82 -135 38 7 21 0 0 10 40 31.2 28 139 -44 -131 21 40 -141 29 16 -130 45 18 -142 45 26 -1.84 -137 32 9 20 0 0 10 39 9.0 28 137 -46 -132 50 57 -144 47 42 -132 12 3 -146 49 51 -1.85 -139 48 40 19 0 0 10 37 36.3 27 134 -48 -134 30 39 ... .. .. -133 48 20 ... .. .. -1.87 Latitude Latitude Latitude Latitude -140 0 0 18 55 34 10 37 28.9 27 134 -48 16 29 12 21 35 27 16 6 50 22 2 34 -1.84 -141 0 0 18 33 28 10 36 50.3 26 133 -49 16 8 55 21 11 1 15 46 48 21 37 42 -1.86 -142 0 0 18 13 36 10 36 13.0 25 133 -50 15 50 41 20 49 3 15 28 48 21 15 19 -1.86 -143 0 0 17 55 53 10 35 36.8 25 132 -50 15 34 27 20 29 27 15 12 47 20 55 22 -1.86 -144 0 0 17 40 17 10 35 1.9 24 131 -51 15 20 11 20 12 9 14 58 42 20 37 46 -1.86 -145 0 0 17 26 44 10 34 28.2 23 130 -52 15 7 50 19 57 5 14 46 31 20 22 25 -1.86 -146 0 0 17 15 11 10 33 55.8 23 130 -52 14 57 21 19 44 12 14 36 11 20 9 17 -1.86 -147 0 0 17 5 35 10 33 24.5 22 129 -53 14 48 42 19 33 26 14 27 40 19 58 17 -1.86 -148 0 0 16 57 55 10 32 54.5 21 128 -53 14 41 51 19 24 43 14 20 56 19 49 24 -1.85 -149 0 0 16 52 7 10 32 25.7 20 128 -54 14 36 46 19 18 3 14 15 57 19 42 33 -1.85 -150 0 0 16 48 10 10 31 58.2 20 127 -54 14 33 26 19 13 21 14 12 42 19 37 43 -1.85 -151 0 0 16 46 2 10 31 31.8 19 127 -54 14 31 47 19 10 35 14 11 8 19 34 51 -1.84 -152 0 0 16 45 41 10 31 6.8 18 126 -55 14 31 50 19 9 45 14 11 14 19 33 55 -1.84 -153 0 0 16 47 6 10 30 42.9 17 126 -55 14 33 33 19 10 47 14 13 0 19 34 53 -1.83 -154 0 0 16 50 15 10 30 20.3 16 125 -55 14 36 54 19 13 41 14 16 22 19 37 43 -1.83 -155 0 0 16 55 7 10 29 59.0 15 125 -55 14 41 53 19 18 23 14 21 22 19 42 25 -1.82 -156 0 0 17 1 40 10 29 38.9 14 124 -55 14 48 28 19 24 55 14 27 57 19 48 56 -1.82 -157 0 0 17 9 55 10 29 20.2 13 124 -55 14 56 38 19 33 16 14 36 7 19 57 18 -1.81 -158 0 0 17 19 49 10 29 2.6 13 123 -55 15 6 23 19 43 22 14 45 50 20 7 26 -1.81 -159 0 0 17 31 23 10 28 46.4 12 123 -54 15 17 42 19 55 15 14 57 7 20 19 22 -1.80 -160 0 0 17 44 36 10 28 31.5 11 123 -54 15 30 34 20 8 52 15 9 56 20 33 5 -1.80 -161 0 0 17 59 26 10 28 17.9 10 122 -54 15 44 59 20 24 16 15 24 18 20 48 34 -1.80 -162 0 0 18 15 55 10 28 5.6 9 122 -53 16 0 56 20 41 23 15 40 11 21 5 49 -1.80 -163 0 0 18 34 1 10 27 54.7 8 121 -53 16 18 26 21 0 16 15 57 35 21 24 50 -1.80 -164 0 0 18 53 45 10 27 45.1 7 121 -53 16 37 27 21 20 53 16 16 30 21 45 37 -1.80 -165 0 0 19 15 6 10 27 36.8 6 121 -52 16 58 1 21 43 15 16 36 57 22 8 11 -1.81 -166 0 0 19 38 5 10 27 30.0 5 120 -51 17 20 5 22 7 23 16 58 54 22 32 32 -1.83 -167 0 0 20 2 42 10 27 24.5 4 120 -51 17 43 42 22 33 17 17 22 21 22 58 40 -1.86 -168 0 0 20 28 56 10 27 20.5 2 120 -50 18 8 50 23 0 57 17 47 20 23 26 36 -1.93 -169 0 0 20 56 50 10 27 17.8 1 119 -49 18 35 30 23 30 25 18 13 50 23 56 22 -2.11 -170 0 0 21 26 23 10 27 16.7 0 119 -49 19 3 42 .. .. .. 18 41 51 .. .. .. -3.38 -171 0 0 .. .. .... .. .. .. .. .. .. 19 33 27 .. .. .. 19 11 24 .. .. .. .... Uncertainty in time = +/- 11 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 317-225674 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 38 43.3195 DE: -26 39 59.837 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 38 43.3195 DE: -26 39 59.837 * 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: (15) Eunomia asteroid class: ShapeModel approx. diameter [km]: 248 approx. diameter ["]: 0.158 distance from Earth [AU]: 2.16680 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): 0.022", 0.012", 68.246° remarks: * orbital elements for (15)Eunomia : Mean anomaly = 261.6634805779 deg Arg. of pericenter = 98.7319006706 deg Long. of node = 292.9068857457 deg Inclination = 11.7541292269 deg Eccentricity = 0.1870401481 Semimajor axis = 2.6428997341 AU Perihelion dist = 2.1485713765 AU Mag: H = 5.38, G = 0.23 Epoch of elements : MJD 60076.44729167 TDT (2023 May 12.4473) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#932023Apr24,81.64,2023,5,12,10.737607,-0.522084,0.699996,1.375882,1.026509,-0.004902,-0.000593,0.000001,0.000000 -95.9745,-26.6134,18.03,18.13,False UCAC4 317-225674,19.64536651,-26.6666213,0.00,12.44,0.00,0.0,0,,19.66928004,-26.6134352,0.13,0.00,0,0,0 15,Eunomia,10.24,248.3,2.1668,0,0,0.416,4.17,,14.4,0 0,261.5609,2023,5,12,98.7319,292.9069,11.7541,0.18704,2.64290,2.14857,5.38,5.0,0.15 1.080,0.0220,0.0117,68,0.0126,Known errors,-1.00,-1,-1,-1 20230512_225674,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org