IOTA/IOTA-ES occultation update for (3906) Chao / TYC 82-00270-1 event on 2024 Jul 16, 09:33 UT Visible from Summary ------- On 2024 Jul 16 UT, the 44.572 km diameter asteroid (3906) Chao will occult a 11.1 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.33 mag to 16.41 mag (the magnitude of the asteroid) for at most 1.180 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 16, 09:30 - 2024 Jul 16, 09:36 * geocentric midpoint of event [JD]: 2460507.89835338 * magnitude of target star: 11.09 * magnitude drop [mag]: 5.33 * estimated maximum duration [s]: 1.180 * Moon: 73 % sunlit, 152° distance * Sun: 51° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 0.26 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.004", 80°) * approx speed of asteroid's shadow [km/s]: 37.7711 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 82-00270-1 by 3906 Chao on 2024 Jul 16 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 - 98 0 0 - 6 20 10 9 30 50.8 1 90 -46 - 6 32 24 - 6 7 56 - 6 38 45 - 6 1 36 .... - 97 0 0 - 6 19 49 9 30 50.9 2 89 -45 - 6 32 3 - 6 7 36 - 6 38 24 - 6 1 15 0.10 - 96 0 0 - 6 19 32 9 30 51.0 3 89 -44 - 6 31 46 - 6 7 18 - 6 38 7 - 6 0 58 0.12 - 95 0 0 - 6 19 17 9 30 51.2 4 89 -43 - 6 31 31 - 6 7 3 - 6 37 52 - 6 0 43 0.13 - 94 0 0 - 6 19 4 9 30 51.4 5 89 -42 - 6 31 18 - 6 6 50 - 6 37 39 - 6 0 30 0.13 - 93 0 0 - 6 18 54 9 30 51.6 6 89 -41 - 6 31 8 - 6 6 40 - 6 37 29 - 6 0 20 0.14 - 92 0 0 - 6 18 46 9 30 51.9 7 89 -40 - 6 31 0 - 6 6 33 - 6 37 21 - 6 0 12 0.14 - 91 0 0 - 6 18 41 9 30 52.3 8 89 -39 - 6 30 55 - 6 6 28 - 6 37 16 - 6 0 7 0.14 - 90 0 0 - 6 18 39 9 30 52.7 9 89 -38 - 6 30 53 - 6 6 25 - 6 37 14 - 6 0 5 0.14 - 89 0 0 - 6 18 39 9 30 53.2 10 89 -37 - 6 30 53 - 6 6 26 - 6 37 14 - 6 0 5 0.14 - 88 0 0 - 6 18 42 9 30 53.7 11 88 -36 - 6 30 56 - 6 6 28 - 6 37 17 - 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1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.015", 0.004", 79.694° remarks: * orbital elements for (3906)Chao : Mean anomaly = 46.0456784903 deg Arg. of pericenter = 209.1567259185 deg Long. of node = 149.0878172681 deg Inclination = 26.0421427105 deg Eccentricity = 0.0710801286 Semimajor axis = 2.9342587570 AU Perihelion dist = 2.7256912673 AU Mag: H = 10.69, G = 0.15 Epoch of elements : MJD 60507.39835370 TDT (2024 Jul 16.3984) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr27,1.18,2024,7,16,9.560481,-0.006269,-0.148764,21.302402,-0.842847,-0.003825,-0.001979,-0.000001,0.000000 -9.3407,0.3631,38.13,21.25,False TYC 82-00270-1,4.56487382,0.3103524,11.37,11.09,10.94,0.0,0,,4.58557725,0.3631498,5.33,5.04,0,0,0 3906,Chao,16.41,44.572,3.3273,0,0,3.754,-2.23,,2.2,0 0,45.9676,2024,7,16,209.1567,149.0878,26.0421,0.07108,2.93426,2.72569,10.69,5.0,0.15 1.259,0.0147,0.0037,80,0.0048,Known errors,1.25,0,-1,-1 20240716_0270-1,60140.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org