IOTA/IOTA-ES occultation update for (43) Ariadne / UCAC4 345-115773 event on 2024 Sep 21, 09:10 UT Visible from Summary ------- On 2024 Sep 21 UT, the 60.7481678514678 km diameter asteroid (43) Ariadne will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.67 mag to 11.68 mag (the magnitude of the asteroid) for at most 2.790 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: 2024 Sep 21, 09:05 - 2024 Sep 21, 09:15 * geocentric midpoint of event [JD]: 2460574.88245495 * magnitude of target star: 11.85 * magnitude drop [mag]: 0.67 * estimated maximum duration [s]: 2.790 * Moon: 85 % sunlit, 137° distance * Sun: 88° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 63 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.001", 87°) * approx speed of asteroid's shadow [km/s]: 21.8364 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 345-115773 by 43 Ariadne on 2024 Sep 21 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 45 0 0 12 6 2 9 5 59.8 1 112 78 11 47 50 12 24 15 11 46 24 12 25 41 .... 46 0 0 11 42 39 9 6 0.0 2 112 78 11 24 28 12 0 52 11 23 1 12 2 18 -0.08 47 0 0 11 19 17 9 6 0.2 3 112 78 11 1 6 11 37 30 10 59 40 11 38 56 -0.14 48 0 0 10 55 56 9 6 0.5 4 112 78 10 37 45 11 14 9 10 36 19 11 15 35 -0.16 49 0 0 10 32 37 9 6 0.9 5 113 78 10 14 27 10 50 49 10 13 1 10 52 16 -0.18 50 0 0 10 9 21 9 6 1.4 6 113 77 9 51 11 10 27 32 9 49 45 10 28 59 -0.18 51 0 0 9 46 7 9 6 2.1 7 113 77 9 27 58 10 4 18 9 26 32 10 5 44 -0.19 52 0 0 9 22 57 9 6 2.8 8 113 76 9 4 48 9 41 8 9 3 22 9 42 34 -0.20 53 0 0 8 59 51 9 6 3.6 9 113 76 8 41 43 9 18 1 8 40 17 9 19 27 -0.20 54 0 0 8 36 50 9 6 4.6 10 113 75 8 18 42 8 54 59 8 17 16 8 56 25 -0.20 55 0 0 8 13 53 9 6 5.6 11 114 75 7 55 46 8 32 2 7 54 20 8 33 28 -0.20 56 0 0 7 51 3 9 6 6.8 12 114 74 7 32 56 8 9 11 7 31 31 8 10 37 -0.21 57 0 0 7 28 19 9 6 8.0 13 114 73 7 10 13 7 46 26 7 8 47 7 47 52 -0.21 58 0 0 7 5 41 9 6 9.3 14 114 72 6 47 37 7 23 48 6 46 11 7 25 14 -0.21 59 0 0 6 43 12 9 6 10.8 16 114 72 6 25 8 7 1 17 6 23 42 7 2 43 -0.21 60 0 0 6 20 50 9 6 12.3 17 114 71 6 2 47 6 38 54 6 1 21 6 40 20 -0.21 61 0 0 5 58 36 9 6 14.0 18 114 70 5 40 34 6 16 40 5 39 9 6 18 6 -0.21 62 0 0 5 36 32 9 6 15.7 19 115 69 5 18 31 5 54 35 5 17 5 5 56 0 -0.21 63 0 0 5 14 37 9 6 17.6 20 115 68 4 56 37 5 32 39 4 55 12 5 34 5 -0.22 64 0 0 4 52 53 9 6 19.5 21 115 67 4 34 53 5 10 53 4 33 28 5 12 19 -0.22 65 0 0 4 31 19 9 6 21.5 22 115 66 4 13 20 4 49 18 4 11 55 4 50 44 -0.22 66 0 0 4 9 56 9 6 23.7 23 115 65 3 51 59 4 27 54 3 50 34 4 29 19 -0.22 67 0 0 3 48 44 9 6 25.9 24 115 64 3 30 48 4 6 42 3 29 23 4 8 7 -0.22 68 0 0 3 27 45 9 6 28.2 25 115 63 3 9 50 3 45 41 3 8 25 3 47 6 -0.22 69 0 0 3 6 58 9 6 30.6 26 115 62 2 49 5 3 24 53 2 47 40 3 26 18 -0.22 70 0 0 2 46 24 9 6 33.1 27 115 62 2 28 32 3 4 18 2 27 7 3 5 43 -0.22 71 0 0 2 26 4 9 6 35.7 28 116 61 2 8 13 2 43 57 2 6 48 2 45 22 -0.22 72 0 0 2 5 58 9 6 38.4 29 116 60 1 48 8 2 23 49 1 46 43 2 25 14 -0.22 73 0 0 1 46 6 9 6 41.2 30 116 59 1 28 17 2 3 56 1 26 53 2 5 20 -0.22 74 0 0 1 26 29 9 6 44.1 31 116 58 1 8 41 1 44 17 1 7 17 1 45 42 -0.22 75 0 0 1 7 7 9 6 47.0 32 116 57 0 49 21 1 24 54 0 47 56 1 26 18 -0.22 76 0 0 0 48 0 9 6 50.0 34 116 56 0 30 15 1 5 46 0 28 51 1 7 11 -0.22 77 0 0 0 29 10 9 6 53.1 35 116 55 0 11 26 0 46 55 0 10 2 0 48 19 -0.22 78 0 0 0 10 36 9 6 56.3 36 116 54 - 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0 35 39 - 0 0 18 - 0 37 3 0 1 6 -0.23 178 0 0 0 0 8 9 14 30.0 36 243 -48 - 0 17 33 0 17 51 - 0 18 57 0 19 15 -0.23 179 0 0 0 18 33 9 14 33.2 35 244 -49 0 0 50 0 36 17 - 0 0 34 0 37 41 -0.23 180 0 0 0 37 14 9 14 36.4 34 244 -50 0 19 30 0 54 59 0 18 6 0 56 23 -0.23 -179 0 0 0 56 11 9 14 39.4 33 244 -51 0 38 26 1 13 58 0 37 2 1 15 22 -0.23 -178 0 0 1 15 25 9 14 42.4 32 244 -52 0 57 38 1 33 12 0 56 14 1 34 37 -0.23 -177 0 0 1 34 53 9 14 45.4 31 244 -53 1 17 5 1 52 42 1 15 41 1 54 7 -0.23 -176 0 0 1 54 37 9 14 48.2 30 244 -54 1 36 48 2 12 27 1 35 23 2 13 52 -0.23 -175 0 0 2 14 35 9 14 50.9 29 244 -55 1 56 45 2 32 27 1 55 20 2 33 52 -0.23 -174 0 0 2 34 48 9 14 53.6 28 244 -56 2 16 56 2 52 41 2 15 31 2 54 5 -0.23 -173 0 0 2 55 14 9 14 56.1 27 245 -57 2 37 21 3 13 8 2 35 56 3 14 33 -0.23 -172 0 0 3 15 53 9 14 58.6 26 245 -58 2 57 59 3 33 49 2 56 34 3 35 14 -0.23 -171 0 0 3 36 46 9 15 1.0 25 245 -59 3 18 50 3 54 42 3 17 25 3 56 7 -0.23 -170 0 0 3 57 50 9 15 3.3 24 245 -60 3 39 54 4 15 48 3 38 29 4 17 13 -0.23 -169 0 0 4 19 7 9 15 5.5 23 245 -61 4 1 9 4 37 6 3 59 44 4 38 31 -0.23 -168 0 0 4 40 34 9 15 7.6 22 245 -62 4 22 36 4 58 35 4 21 11 5 0 0 -0.23 -167 0 0 5 2 13 9 15 9.6 20 245 -63 4 44 14 5 20 14 4 42 48 5 21 40 -0.23 -166 0 0 5 24 2 9 15 11.5 19 245 -64 5 6 2 5 42 4 5 4 36 5 43 30 -0.23 -165 0 0 5 46 1 9 15 13.3 18 246 -65 5 28 0 6 4 4 5 26 34 6 5 30 -0.23 -164 0 0 6 8 10 9 15 15.0 17 246 -66 5 50 7 6 26 14 5 48 42 6 27 39 -0.23 -163 0 0 6 30 27 9 15 16.6 16 246 -67 6 12 23 6 48 32 6 10 58 6 49 57 -0.23 -162 0 0 6 52 52 9 15 18.1 15 246 -67 6 34 48 7 10 58 6 33 22 7 12 24 -0.23 -161 0 0 7 15 25 9 15 19.5 14 246 -68 6 57 20 7 33 32 6 55 54 7 34 58 -0.23 -160 0 0 7 38 6 9 15 20.8 13 246 -69 7 20 0 7 56 13 7 18 34 7 57 39 -0.23 -159 0 0 8 0 53 9 15 22.0 12 246 -70 7 42 46 8 19 1 7 41 20 8 20 27 -0.23 -158 0 0 8 23 46 9 15 23.1 11 247 -71 8 5 38 8 41 55 8 4 12 8 43 21 -0.23 -157 0 0 8 46 44 9 15 24.1 10 247 -71 8 28 36 9 4 54 8 27 10 9 6 20 -0.23 -156 0 0 9 9 48 9 15 25.0 9 247 -72 8 51 39 9 27 58 8 50 13 9 29 24 -0.23 -155 0 0 9 32 56 9 15 25.8 8 247 -73 9 14 47 9 51 7 9 13 21 9 52 33 -0.22 -154 0 0 9 56 8 9 15 26.5 7 247 -73 9 37 58 10 14 19 9 36 32 10 15 45 -0.22 -153 0 0 10 19 23 9 15 27.1 6 247 -74 10 1 12 10 37 34 9 59 46 10 39 1 -0.22 -152 0 0 10 42 40 9 15 27.6 5 248 -74 10 24 30 11 0 53 10 23 4 11 2 19 -0.22 -151 0 0 11 6 0 9 15 27.9 3 248 -75 10 47 49 11 24 13 10 46 23 11 25 39 -0.22 -150 0 0 11 29 22 9 15 28.2 2 248 -75 11 11 10 11 47 35 11 9 44 11 49 1 -0.22 -149 0 0 11 52 44 9 15 28.4 1 248 -75 11 34 33 12 10 57 11 33 6 12 12 24 -0.22 -148 0 0 12 16 7 9 15 28.5 0 248 -75 11 57 55 12 34 20 11 56 29 12 35 47 -0.18 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 345-115773 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 45 29.2863 DE: -21 05 04.793 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 45 29.2862 DE: -21 05 04.793 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (43) Ariadne asteroid class: approx. diameter [km]: 61 approx. diameter ["]: 0.053 distance from Earth [AU]: 1.58330 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#134 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): 0.027", 0.001", 86.741° remarks: * orbital elements for (43)Ariadne : Mean anomaly = 13.2080747152 deg Arg. of pericenter = 16.1292275891 deg Long. of node = 264.7468986845 deg Inclination = 3.4706810411 deg Eccentricity = 0.1684874098 Semimajor axis = 2.2031736170 AU Perihelion dist = 1.8319666009 AU Mag: H = 7.98, G = 0.11 Epoch of elements : MJD 60574.38245471 TDT (2024 Sep 21.3825) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1342023Apr24,2.79,2024,9,21,9.178919,-0.000245,0.228203,12.325047,0.002524,0.004988,-0.000110,0.000000,0.000000 128.3170,-21.0953,40.55,0.44,False UCAC4 345-115773,17.75813512,-21.0846646,12.70,11.85,11.39,0.1,0,,17.78271447,-21.0953467,0.67,0.68,0,0,0 43,Ariadne,11.68,60.863,1.5833,0,0,4.892,0.02,,3.6,0 0,13.0928,2024,9,21,16.1292,264.7469,3.4707,0.16849,2.20317,1.83197,7.97,5.0,0.15 1.039,0.0267,0.0015,87,0.0021,Known errors,0.82,0,-1,-1 20240921_115773,60140.58 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org