IOTA/IOTA-ES occultation update for (23408) Beijingaoyun / UCAC4 447-101785 event on 2024 Jul 17, 16:07 UT Visible from Summary ------- On 2024 Jul 17 UT, the 16.5230493584665 km diameter asteroid (23408) Beijingaoyun will occult a 11.6 mag star in the constellation Aquila for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.76 mag to 17.33 mag (the magnitude of the asteroid) for at most 1.330 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 Jul 17, 15:58 - 2024 Jul 17, 16:15 * geocentric midpoint of event [JD]: 2460509.17156946 * magnitude of target star: 11.58 * magnitude drop [mag]: 5.76 * estimated maximum duration [s]: 1.330 * Moon: 84 % sunlit, 48° distance * Sun: 158° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.30 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.024", 0.001", 77°) * approx speed of asteroid's shadow [km/s]: 12.5676 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 447-101785 by 23408 Beijingaoyun on 2024 Jul 17 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 20 0 0 - 8 40 0 16 15 30.3 1 91 4 - 8 35 28 - 8 44 32 - 8 32 46 - 8 47 14 .... 21 0 0 - 8 40 39 16 15 30.1 2 90 3 - 8 36 7 - 8 45 11 - 8 33 25 - 8 47 53 0.04 22 0 0 - 8 41 12 16 15 29.7 3 90 2 - 8 36 40 - 8 45 44 - 8 33 58 - 8 48 26 0.04 23 0 0 - 8 41 39 16 15 29.2 4 90 1 - 8 37 8 - 8 46 11 - 8 34 25 - 8 48 53 0.05 24 0 0 - 8 42 0 16 15 28.6 5 90 0 - 8 37 28 - 8 46 32 - 8 34 46 - 8 49 14 0.05 25 0 0 - 8 42 15 16 15 27.8 6 90 -1 - 8 37 43 - 8 46 47 - 8 35 1 - 8 49 29 0.05 26 0 0 - 8 42 24 16 15 26.8 7 90 -2 - 8 37 52 - 8 46 56 - 8 35 10 - 8 49 38 0.05 27 0 0 - 8 42 27 16 15 25.7 8 90 -2 - 8 37 55 - 8 46 58 - 8 35 13 - 8 49 41 0.05 28 0 0 - 8 42 23 16 15 24.4 9 89 -3 - 8 37 52 - 8 46 55 - 8 35 9 - 8 49 37 0.05 29 0 0 - 8 42 14 16 15 23.0 10 89 -4 - 8 37 42 - 8 46 46 - 8 35 0 - 8 49 28 0.05 30 0 0 - 8 41 59 16 15 21.5 11 89 -5 - 8 37 27 - 8 46 30 - 8 34 45 - 8 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0 5 12 - 0 9 19 0.05 154 0 0 0 2 46 16 1 30.0 49 269 -52 0 7 19 - 0 1 47 0 10 1 - 0 4 29 0.05 155 0 0 0 7 32 16 1 23.5 48 269 -51 0 12 5 0 3 0 0 14 48 0 0 17 0.05 156 0 0 0 12 16 16 1 17.2 47 269 -50 0 16 48 0 7 43 0 19 31 0 5 0 0.05 157 0 0 0 16 56 16 1 10.9 46 269 -49 0 21 28 0 12 23 0 24 11 0 9 40 0.05 158 0 0 0 21 32 16 1 4.7 45 269 -48 0 26 5 0 16 59 0 28 47 0 14 17 0.05 159 0 0 0 26 5 16 0 58.7 44 269 -47 0 30 38 0 21 32 0 33 20 0 18 50 0.05 160 0 0 0 30 34 16 0 52.7 43 269 -47 0 35 7 0 26 2 0 37 50 0 23 19 0.05 161 0 0 0 35 0 16 0 46.9 42 268 -46 0 39 33 0 30 28 0 42 15 0 27 45 0.05 162 0 0 0 39 22 16 0 41.1 41 268 -45 0 43 55 0 34 50 0 46 37 0 32 7 0.05 163 0 0 0 43 41 16 0 35.5 40 268 -44 0 48 13 0 39 8 0 50 55 0 36 25 0.05 164 0 0 0 47 55 16 0 30.0 39 268 -43 0 52 27 0 43 22 0 55 10 0 40 40 0.05 165 0 0 0 52 5 16 0 24.6 38 268 -42 0 56 38 0 47 33 0 59 20 0 44 50 0.05 166 0 0 0 56 12 16 0 19.3 37 268 -41 1 0 44 0 51 39 1 3 27 0 48 57 0.05 167 0 0 1 0 14 16 0 14.1 36 268 -40 1 4 46 0 55 42 1 7 29 0 52 59 0.05 168 0 0 1 4 12 16 0 9.0 35 268 -40 1 8 44 0 59 40 1 11 27 0 56 57 0.05 169 0 0 1 8 6 16 0 4.1 34 268 -39 1 12 38 1 3 33 1 15 21 1 0 51 0.05 170 0 0 1 11 55 15 59 59.3 33 268 -38 1 16 28 1 7 23 1 19 10 1 4 40 0.05 171 0 0 1 15 40 15 59 54.6 32 268 -37 1 20 13 1 11 8 1 22 55 1 8 26 0.05 172 0 0 1 19 21 15 59 50.0 31 268 -36 1 23 53 1 14 49 1 26 36 1 12 6 0.05 173 0 0 1 22 57 15 59 45.6 30 268 -35 1 27 29 1 18 25 1 30 12 1 15 42 0.05 174 0 0 1 26 28 15 59 41.3 29 268 -34 1 31 1 1 21 56 1 33 43 1 19 14 0.05 175 0 0 1 29 55 15 59 37.1 28 268 -33 1 34 27 1 25 23 1 37 10 1 22 41 0.05 176 0 0 1 33 17 15 59 33.0 27 268 -32 1 37 49 1 28 45 1 40 32 1 26 3 0.05 177 0 0 1 36 34 15 59 29.1 26 268 -31 1 41 7 1 32 2 1 43 49 1 29 20 0.05 178 0 0 1 39 47 15 59 25.3 25 268 -31 1 44 19 1 35 14 1 47 1 1 32 32 0.05 179 0 0 1 42 54 15 59 21.6 24 268 -30 1 47 26 1 38 22 1 50 9 1 35 40 0.05 180 0 0 1 45 56 15 59 18.1 23 268 -29 1 50 29 1 41 24 1 53 11 1 38 42 0.05 -179 0 0 1 48 54 15 59 14.7 22 268 -28 1 53 26 1 44 22 1 56 8 1 41 39 0.05 -178 0 0 1 51 46 15 59 11.5 21 268 -27 1 56 18 1 47 14 1 59 0 1 44 31 0.05 -177 0 0 1 54 33 15 59 8.4 20 268 -26 1 59 5 1 50 1 2 1 47 1 47 19 0.05 -176 0 0 1 57 15 15 59 5.4 19 269 -25 2 1 47 1 52 43 2 4 29 1 50 0 0.05 -175 0 0 1 59 51 15 59 2.6 18 269 -24 2 4 23 1 55 19 2 7 5 1 52 37 0.05 -174 0 0 2 2 22 15 58 59.9 17 269 -23 2 6 54 1 57 50 2 9 37 1 55 8 0.05 -173 0 0 2 4 48 15 58 57.4 16 269 -22 2 9 20 2 0 16 2 12 2 1 57 34 0.05 -172 0 0 2 7 8 15 58 55.0 15 269 -21 2 11 40 2 2 36 2 14 23 1 59 54 0.05 -171 0 0 2 9 23 15 58 52.7 14 269 -20 2 13 55 2 4 51 2 16 37 2 2 9 0.05 -170 0 0 2 11 32 15 58 50.6 13 269 -19 2 16 4 2 7 0 2 18 46 2 4 18 0.05 -169 0 0 2 13 36 15 58 48.6 12 269 -19 2 18 8 2 9 4 2 20 50 2 6 22 0.06 -168 0 0 2 15 34 15 58 46.8 11 269 -18 2 20 6 2 11 2 2 22 48 2 8 20 0.06 -167 0 0 2 17 26 15 58 45.2 10 269 -17 2 21 58 2 12 54 2 24 40 2 10 12 0.06 -166 0 0 2 19 13 15 58 43.6 9 269 -16 2 23 45 2 14 41 2 26 27 2 11 59 0.06 -165 0 0 2 20 54 15 58 42.3 8 269 -15 2 25 26 2 16 22 2 28 8 2 13 40 0.06 -164 0 0 2 22 29 15 58 41.1 7 269 -14 2 27 1 2 17 57 2 29 43 2 15 15 0.06 -163 0 0 2 23 58 15 58 40.0 6 269 -13 2 28 30 2 19 26 2 31 12 2 16 44 0.06 -162 0 0 2 25 21 15 58 39.1 5 269 -12 2 29 53 2 20 49 2 32 35 2 18 7 0.06 -161 0 0 2 26 38 15 58 38.3 4 269 -11 2 31 10 2 22 7 2 33 52 2 19 24 0.06 -160 0 0 2 27 50 15 58 37.7 3 269 -10 2 32 22 2 23 18 2 35 4 2 20 36 0.06 -159 0 0 2 28 55 15 58 37.3 2 269 -9 2 33 27 2 24 23 2 36 9 2 21 41 0.07 -158 0 0 2 29 55 15 58 37.0 1 269 -8 2 34 26 2 25 23 2 37 8 2 22 40 0.08 -157 0 0 2 30 48 15 58 36.8 0 269 -7 2 35 20 2 26 16 2 38 2 2 23 34 0.13 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 447-101785 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 15 04.5995 DE: -00 47 45.044 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 15 04.5995 DE: -00 47 45.044 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (23408) Beijingaoyun asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.08130 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 date of fit: 2023 Apr 25 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): 0.024", 0.001", 77.207° remarks: * orbital elements for (23408)Beijingaoyun : Mean anomaly = 281.2422702739 deg Arg. of pericenter = 178.3714781599 deg Long. of node = 214.7422741862 deg Inclination = 14.7382258443 deg Eccentricity = 0.1914685426 Semimajor axis = 3.0506930202 AU Perihelion dist = 2.4665812739 AU Mag: H = 12.79, G = 0.15 Epoch of elements : MJD 60508.67156992 TDT (2024 Jul 17.6716) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr25,1.33,2024,7,17,16.117667,0.005138,-0.052888,-7.060215,-0.686149,0.000791,-0.001933,0.000001,0.000000 111.3531,-0.7529,-60.20,21.03,False UCAC4 447-101785,19.25127763,-0.7958457,12.80,11.58,10.92,0.1,0,,19.27268512,-0.7528872,5.75,5.96,0,0,0 23408,Beijingaoyun,17.33,16.674,2.0813,0,0,-1.988,-2.90,,1.6,0 0,281.1180,2024,7,17,178.3715,214.7423,14.7382,0.19147,3.05069,2.46658,12.79,5.0,0.15 1.298,0.0237,0.0014,77,0.0033,Known errors,0.91,0,-1,-1 20240717_101785,60140.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org