IOTA/IOTA-ES occultation update for (183964) 2004 DJ71 / TYC 0870-00540-1 event on 2023 Mar 30, 07:12 UT Visible from Summary ------- On 2023 Mar 30 UT, the 109.6 km diameter asteroid (183964) 2004 DJ71 will occult a 11.1 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 11.82 mag to 22.87 mag (the magnitude of the asteroid) for at most 4.800 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]: 2460033.79811475 * magnitude of target star: 11.05 * magnitude drop [mag]: 11.82 * estimated maximum duration [s]: 4.800 * Moon: 61 % sunlit, 61° distance * Sun: 161° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 110 * 1 sigma uncertainty interval [path widths]: +/- 134.74 * 1 sigma uncertainty interval [seconds]: +/- 870.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.834, +/- 0.653) * 1 sigma uncertainty ellipse (major, minor, PA): (0.851", 0.632", 107°) * approx speed of asteroid's shadow [km/s]: 22.8273 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: TYC 0870-00540-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 11 53 11.0300 DE: +12 50 49.181 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 11 53 11.0299 DE: +12 50 49.182 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (183964) 2004 DJ71 asteroid class: Centaur approx. diameter [km]: 110 approx. diameter ["]: 0.005 distance from Earth [AU]: 32.14600 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#5 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): 0.851", 0.632", 106.966° remarks: * orbital elements for (183964)2004 DJ71 : Mean anomaly = 6.9602203994 deg Arg. of pericenter = 55.9380720512 deg Long. of node = 101.6145310261 deg Inclination = 11.3088028734 deg Eccentricity = 0.3777698961 Semimajor axis = 52.5802767155 AU Perihelion dist = 32.7170310463 AU Mag: H = 7.63, G = 0.15 Epoch of elements : MJD 60033.30020833 TDT (2023 Mar 30.3002) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#52021Apr13,4.80,2023,3,30,7.154754,0.444385,1.148450,-12.016281,4.649303,0.001069,-0.001698,0.000001,0.000000 -116.1431,12.7168,73.83,3.70,False TYC 0870-00540-1,11.88639720,12.8469950,0.00,11.05,0.00,0.0,0,,11.90651907,12.7168288,11.82,0.00,0,0,0 183964,2004 DJ71,22.87,109.6,32.1460,0,0,-0.224,1.27,,10.8 0,6.9594,2023,3,30,55.9381,101.6145,11.3088,0.37777,52.58028,32.71703,7.63,5.0,0.15 135.737,0.8507,0.6320,107,0.6334,Known errors,-1.00,-1,-1,-1 20230330_0540-1,59744.97 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 14, 23:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org