IOTA/IOTA-ES occultation update for (28978) Ixion / UCAC4 294-162279 event on 2023 Aug 07, 17:21 UT Visible from Summary ------- On 2023 Aug 07 UT, the 709.6 km diameter asteroid (28978) Ixion will occult a 13.5 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 5.88 mag to 19.40 mag (the magnitude of the asteroid) for at most 41.590 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: predicted path center does not land on Earth. * geocentric midpoint of event [JD]: 2460164.22074591 * magnitude of target star: 13.52 * magnitude drop [mag]: 5.88 * estimated maximum duration [s]: 41.590 * Moon: 58 % sunlit, 123° distance * Sun: 137° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 710 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 19.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.007", 106°) * approx speed of asteroid's shadow [km/s]: 17.0604 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: UCAC4 294-162279 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 10 14.7041 DE: -31 15 02.701 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 10 14.7041 DE: -31 15 02.701 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 13.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (28978) Ixion asteroid class: TNO approx. diameter [km]: 710 approx. diameter ["]: 0.026 distance from Earth [AU]: 37.43970 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#19 date of fit: 2023 May 22 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): 0.012", 0.007", 105.872° remarks: * orbital elements for (28978)Ixion : Mean anomaly = 291.9867606708 deg Arg. of pericenter = 299.8175537616 deg Long. of node = 71.0869498636 deg Inclination = 19.6651901772 deg Eccentricity = 0.2469085575 Semimajor axis = 39.5423700357 AU Perihelion dist = 29.7790204893 AU Mag: H = 3.47, G = 0.15 Epoch of elements : MJD 60163.72347222 TDT (2023 Aug 07.7235) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#192023May22,41.59,2023,8,7,17.297902,0.063133,1.220684,-9.616582,0.496166,0.003910,0.000673,0.000001,0.000000 57.5062,-31.2472,-78.01,16.35,False UCAC4 294-162279,18.17075113,-31.2507502,0.00,13.52,0.00,0.0,0,,18.19639128,-31.2471585,5.89,0.00,0,0,0 28978,Ixion,19.40,709.600,37.4397,0,0,-0.176,0.12,,0.2,0 0,291.9839,2023,8,7,299.8176,71.0869,19.6652,0.24691,39.54237,29.77902,3.47,5.0,0.15 1.270,0.0123,0.0067,106,0.0071,Known errors,-1.00,-1,-1,-1 20230807_162279,60110.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jun 15, 05:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org