IOTA/IOTA-ES occultation update for (4230) van / TYC 846-01032-1 event on 2024 Jul 05, 23:21 UT Visible from Summary ------- On 2024 Jul 05 UT, the 31.239 km diameter asteroid (4230) van will occult a 9.9 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.39 mag to 18.31 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 Jul 05, 23:17 - 2024 Jul 05, 23:24 * geocentric midpoint of event [JD]: 2460497.47296787 * magnitude of target star: 9.92 * magnitude drop [mag]: 8.39 * estimated maximum duration [s]: 0.950 * Moon: 0 % sunlit, 56° distance * Sun: 56° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.001", 109°) * approx speed of asteroid's shadow [km/s]: 32.8712 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 846-01032-1 by 4230 van on 2024 Jul 5 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 158 0 0 6 37 26 23 17 56.4 1 82 54 6 28 36 6 46 16 6 26 26 6 48 26 .... 159 0 0 6 45 45 23 17 56.5 2 82 55 6 36 55 6 54 34 6 34 45 6 56 44 0.14 160 0 0 6 53 39 23 17 56.6 3 82 56 6 44 49 7 2 28 6 42 40 7 4 37 0.19 161 0 0 7 1 9 23 17 56.8 4 82 57 6 52 20 7 9 57 6 50 10 7 12 7 0.21 162 0 0 7 8 14 23 17 57.0 5 82 57 6 59 26 7 17 3 6 57 16 7 19 12 0.22 163 0 0 7 14 56 23 17 57.3 6 82 58 7 6 8 7 23 44 7 3 58 7 25 53 0.23 164 0 0 7 21 13 23 17 57.7 7 83 59 7 12 25 7 30 0 7 10 15 7 32 9 0.23 165 0 0 7 27 5 23 17 58.1 8 83 60 7 18 17 7 35 52 7 16 8 7 38 1 0.24 166 0 0 7 32 33 23 17 58.6 9 83 61 7 23 45 7 41 19 7 21 36 7 43 28 0.24 167 0 0 7 37 36 23 17 59.2 10 83 62 7 28 49 7 46 22 7 26 40 7 48 31 0.24 168 0 0 7 42 14 23 17 59.8 11 83 63 7 33 27 7 51 0 7 31 18 7 53 9 0.24 169 0 0 7 46 28 23 18 0.4 12 83 64 7 37 41 7 55 14 7 35 32 7 57 22 0.25 170 0 0 7 50 16 23 18 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 846-01032-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 10 48 04.7718 DE: +08 20 33.786 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 10 48 04.7715 DE: +08 20 33.787 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.9 * B mag [mag]: 10.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4230) van asteroid class: approx. diameter [km]: 31 approx. diameter ["]: 0.011 distance from Earth [AU]: 3.87900 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 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): 0.014", 0.001", 108.625° remarks: * orbital elements for (4230)van : Mean anomaly = 355.8645480582 deg Arg. of pericenter = 19.6086515595 deg Long. of node = 160.4376751844 deg Inclination = 3.1006668261 deg Eccentricity = 0.1347315904 Semimajor axis = 3.9493745054 AU Perihelion dist = 3.4172689972 AU Mag: H = 11.89, G = 0.15 Epoch of elements : MJD 60496.97296787 TDT (2024 Jul 05.9730) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.95,2024,7,5,23.351229,-0.089421,-0.234655,17.307607,-6.684031,0.004401,-0.001766,-0.000001,0.000000 -112.3730,8.2150,-169.07,22.66,False TYC 846-01032-1,10.80132553,8.3427181,10.18,9.92,9.78,0.0,0,,10.82245320,8.2150059,8.39,8.08,0,0,0 4230,van,18.31,31.239,3.8790,0,0,2.644,-15.16,,2.4,0 0,355.7424,2024,7,5,19.6087,160.4377,3.1007,0.13473,3.94937,3.41727,11.89,5.0,0.15 1.122,0.0140,0.0012,109,0.0014,Known errors,1.06,0,-1,-1 20240705_1032-1,60140.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org