IOTA/IOTA-ES occultation update for (3136) Anshan / UCAC4 322-191183 event on 2024 Oct 15, 08:21 UT Visible from Summary ------- On 2024 Oct 15 UT, the 19.761 km diameter asteroid (3136) Anshan will occult a 12.0 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 6.66 mag to 18.62 mag (the magnitude of the asteroid) for at most 0.950 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: 2024 Oct 15, 08:16 - 2024 Oct 15, 08:26 * geocentric midpoint of event [JD]: 2460598.84812242 * magnitude of target star: 11.96 * magnitude drop [mag]: 6.66 * estimated maximum duration [s]: 0.950 * Moon: 93 % sunlit, 72° distance * Sun: 78° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.001", 91°) * approx speed of asteroid's shadow [km/s]: 20.7079 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 322-191183 by 3136 Anshan on 2024 Oct 15 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 34 0 0 -18 23 22 8 16 20.7 0 117 70 -18 29 37 .. .. .. -18 32 59 .. .. .. .... 35 0 0 -18 52 34 8 16 20.7 1 117 70 -18 58 50 -18 46 19 -19 2 12 -18 42 57 0.29 36 0 0 -19 21 40 8 16 20.9 2 116 71 -19 27 55 -19 15 25 -19 31 18 -19 12 3 0.29 37 0 0 -19 50 39 8 16 21.2 3 116 71 -19 56 54 -19 44 24 -20 0 16 -19 41 2 0.29 38 0 0 -20 19 29 8 16 21.6 4 116 72 -20 25 44 -20 13 14 -20 29 6 -20 9 53 0.29 39 0 0 -20 48 10 8 16 22.1 5 115 72 -20 54 25 -20 41 56 -20 57 47 -20 38 34 0.29 40 0 0 -21 16 42 8 16 22.7 6 115 73 -21 22 57 -21 10 28 -21 26 18 -21 7 6 0.28 41 0 0 -21 45 3 8 16 23.4 7 115 73 -21 51 18 -21 38 49 -21 54 39 -21 35 28 0.28 42 0 0 -22 13 13 8 16 24.2 8 114 73 -22 19 27 -22 7 0 -22 22 49 -22 3 38 0.28 43 0 0 -22 41 12 8 16 25.1 10 114 73 -22 47 25 -22 34 58 -22 50 47 -22 31 37 0.28 44 0 0 -23 8 58 8 16 26.1 11 113 74 -23 15 11 -23 2 44 -23 18 32 -22 59 24 0.28 45 0 0 -23 36 30 8 16 27.2 12 113 74 -23 42 43 -23 30 17 -23 46 4 -23 26 57 0.28 46 0 0 -24 3 49 8 16 28.4 13 113 74 -24 10 2 -23 57 37 -24 13 22 -23 54 16 0.28 47 0 0 -24 30 54 8 16 29.7 14 112 73 -24 37 6 -24 24 42 -24 40 26 -24 21 21 0.28 48 0 0 -24 57 43 8 16 31.1 15 112 73 -25 3 55 -24 51 32 -25 7 15 -24 48 12 0.28 49 0 0 -25 24 17 8 16 32.6 16 111 73 -25 30 28 -25 18 6 -25 33 48 -25 14 46 0.28 50 0 0 -25 50 35 8 16 34.1 17 111 73 -25 56 46 -25 44 24 -26 0 5 -25 41 5 0.28 51 0 0 -26 16 36 8 16 35.8 18 110 72 -26 22 46 -26 10 26 -26 26 6 -26 7 7 0.28 52 0 0 -26 42 20 8 16 37.5 19 110 72 -26 48 30 -26 36 11 -26 51 49 -26 32 52 0.28 53 0 0 -27 7 46 8 16 39.4 20 109 72 -27 13 55 -27 1 38 -27 17 14 -26 58 19 0.28 54 0 0 -27 32 55 8 16 41.3 21 109 71 -27 39 3 -27 26 46 -27 42 22 -27 23 28 0.28 55 0 0 -27 57 44 8 16 43.2 22 108 71 -28 3 52 -27 51 37 -28 7 10 -27 48 19 0.28 56 0 0 -28 22 15 8 16 45.3 23 108 70 -28 28 22 -28 16 8 -28 31 40 -28 12 50 0.28 57 0 0 -28 46 26 8 16 47.4 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2 -19 18 56 -18 59 40 0.30 -154 0 0 -18 39 54 8 25 54.0 21 249 -54 -18 46 10 -18 33 38 -18 49 32 -18 30 16 0.30 -153 0 0 -18 10 23 8 25 56.1 20 249 -55 -18 16 39 -18 4 8 -18 20 2 -18 0 45 0.30 -152 0 0 -17 40 47 8 25 58.1 19 248 -56 -17 47 3 -17 34 31 -17 50 26 -17 31 9 0.30 -151 0 0 -17 11 6 8 25 59.9 17 248 -57 -17 17 22 -17 4 50 -17 20 45 -17 1 28 0.30 -150 0 0 -16 41 21 8 26 1.7 16 248 -58 -16 47 37 -16 35 5 -16 51 0 -16 31 43 0.30 -149 0 0 -16 11 33 8 26 3.4 15 247 -59 -16 17 49 -16 5 17 -16 21 11 -16 1 55 0.30 -148 0 0 -15 41 42 8 26 4.9 14 247 -60 -15 47 58 -15 35 27 -15 51 21 -15 32 4 0.30 -147 0 0 -15 11 50 8 26 6.4 13 247 -61 -15 18 6 -15 5 34 -15 21 28 -15 2 12 0.31 -146 0 0 -14 41 57 8 26 7.7 12 246 -62 -14 48 13 -14 35 42 -14 51 35 -14 32 20 0.31 -145 0 0 -14 12 4 8 26 8.9 11 246 -63 -14 18 20 -14 5 49 -14 21 42 -14 2 27 0.31 -144 0 0 -13 42 13 8 26 10.0 10 246 -64 -13 48 28 -13 35 58 -13 51 50 -13 32 36 0.31 -143 0 0 -13 12 23 8 26 11.0 9 246 -65 -13 18 38 -13 6 8 -13 22 0 -13 2 46 0.32 -142 0 0 -12 42 36 8 26 11.9 8 245 -66 -12 48 50 -12 36 21 -12 52 12 -12 33 0 0.32 -141 0 0 -12 12 52 8 26 12.7 7 245 -66 -12 19 6 -12 6 38 -12 22 28 -12 3 17 0.33 -140 0 0 -11 43 13 8 26 13.3 6 245 -67 -11 49 27 -11 36 59 -11 52 48 -11 33 38 0.34 -139 0 0 -11 13 39 8 26 13.8 4 245 -68 -11 19 53 -11 7 26 -11 23 14 -11 4 4 0.35 -138 0 0 -10 44 11 8 26 14.3 3 245 -69 -10 50 24 -10 37 58 -10 53 45 -10 34 37 0.38 -137 0 0 -10 14 50 8 26 14.6 2 244 -70 -10 21 3 -10 8 37 -10 24 24 -10 5 17 0.43 -136 0 0 - 9 45 37 8 26 14.7 1 244 -71 - 9 51 49 - 9 39 24 - 9 55 10 - 9 36 4 0.57 -135 0 0 - 9 16 32 8 26 14.8 0 244 -71 - 9 22 44 .. .. .. - 9 26 4 .. .. .. 20.82 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 322-191183 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 44 26.1708 DE: -25 36 24.133 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 44 26.1706 DE: -25 36 24.133 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.0 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3136) Anshan asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.67960 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 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): 0.013", 0.001", 91.466° remarks: * orbital elements for (3136)Anshan : Mean anomaly = 178.5230000773 deg Arg. of pericenter = 36.1655558228 deg Long. of node = 80.7640867226 deg Inclination = 4.5424517258 deg Eccentricity = 0.1427154406 Semimajor axis = 3.1546826980 AU Perihelion dist = 2.7044607668 AU Mag: H = 12.15, G = 0.15 Epoch of elements : MJD 60598.34812208 TDT (2024 Oct 15.3481) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr24,0.95,2024,10,15,8.354938,0.023430,-0.262272,11.642771,1.028763,0.005750,0.000402,0.000000,0.000000 131.8039,-25.5827,51.10,-8.75,False UCAC4 322-191183,18.74060302,-25.6067036,12.32,11.96,11.77,0.0,0,K,18.76596561,-25.5826820,6.66,6.41,0,0,0 3136,Anshan,18.62,19.761,3.6796,0,0,2.057,2.46,,1.8,0 0,178.4618,2024,10,15,36.1656,80.7641,4.5425,0.14272,3.15468,2.70446,12.15,5.0,0.15 1.269,0.0127,0.0014,91,0.0020,Known errors,0.80,0,-1,-1 20241015_191183,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org