IOTA/IOTA-ES occultation update for (119069) 2001 KN77 / UCAC4 324-143184 event on 2023 Aug 29, 11:07 UT Visible from Summary ------- On 2023 Aug 29 UT, the 125.8 km diameter asteroid (119069) 2001 KN77 will occult a 15.0 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 7.33 mag to 22.32 mag (the magnitude of the asteroid) for at most 15.970 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: 0 * date and approx. time of event: predicted path center does not land on Earth. * geocentric midpoint of event [JD]: 2460186.19713867 * magnitude of target star: 14.99 * magnitude drop [mag]: 7.33 * estimated maximum duration [s]: 15.970 * Moon: 97 % sunlit, 43° distance * Sun: 118° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 126 * 1 sigma uncertainty interval [path widths]: +/- 79.09 * 1 sigma uncertainty interval [seconds]: +/- 16271.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 5.661, +/- 0.296) * 1 sigma uncertainty ellipse (major, minor, PA): (5.661", 0.296", 90°) * approx speed of asteroid's shadow [km/s]: 7.8759 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: UCAC4 324-143184 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 16 33.4827 DE: -25 13 18.213 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 16 33.4824 DE: -25 13 18.213 * position source: Gaia DR3 * standard error: RA,DE [mas]: (4.000,3.100) * V mag [mag]: 15.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (119069) 2001 KN77 asteroid class: TNO approx. diameter [km]: 126 approx. diameter ["]: 0.006 distance from Earth [AU]: 31.47910 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#14 date of fit: 2021 Apr 13 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): 5.661", 0.296", 89.966° remarks: * orbital elements for (119069)2001 KN77 : Mean anomaly = 328.2298018746 deg Arg. of pericenter = 280.9035871670 deg Long. of node = 45.4754377667 deg Inclination = 2.3643353022 deg Eccentricity = 0.2425136343 Semimajor axis = 39.1481282456 AU Perihelion dist = 29.6541733892 AU Mag: H = 7.42, G = 0.15 Epoch of elements : MJD 60185.46340278 TDT (2023 Aug 29.4634) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#142021Apr13,15.97,2023,8,29,16.731328,0.094719,1.648819,-4.438419,0.248664,0.005185,0.000254,0.000001,0.000000 45.9033,-25.2143,-70.72,9.27,False UCAC4 324-143184,18.27596732,-25.2217258,0.00,14.99,0.00,0.0,0,,18.30035807,-25.2142877,7.33,0.00,0,0,2 119069,2001 KN77,22.32,125.8,31.4791,0,0,-0.092,0.07,,12.4 0,328.2279,2023,8,29,280.9036,45.4754,2.3643,0.24251,39.14813,29.65417,7.10,5.0,0.15 80.088,5.6607,0.2960,90,0.4358,Known errors,-1.00,-1,-1,-1 20230829_143184,59745.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 15, 04:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org