IOTA/IOTA-ES occultation update for (600217) 2011 QY100 / UCAC4 438-014504 event on 2023 Feb 20, 18:48 UT Visible from Summary ------- On 2023 Feb 20 UT, the 75.5 km diameter asteroid (600217) 2011 QY100 will occult a 14.6 mag star in the constellation Orion for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.77 mag to 21.39 mag (the magnitude of the asteroid) for at most 5.370 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: 6 * date and approx. time of event: predicted path center does not land on Earth. * geocentric midpoint of event [JD]: 2459996.28515750 * magnitude of target star: 14.62 * magnitude drop [mag]: 6.77 * estimated maximum duration [s]: 5.370 * Moon: 0 % sunlit, 111° distance * Sun: 118° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 76 * 1 sigma uncertainty interval [path widths]: +/- 10.45 * 1 sigma uncertainty interval [seconds]: +/- 39.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.059, +/- 0.035) * 1 sigma uncertainty ellipse (major, minor, PA): (0.059", 0.035", 83°) * approx speed of asteroid's shadow [km/s]: 14.0501 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: UCAC4 438-014504 * constellation : Orion * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 12 48.3259 DE: -02 32 14.653 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 12 48.3259 DE: -02 32 14.653 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 14.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (600217) 2011 QY100 asteroid class: Centaur approx. diameter [km]: 76 approx. diameter ["]: 0.005 distance from Earth [AU]: 19.28320 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#13 date of fit: 2021 Nov 10 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): 0.059", 0.035", 83.3° remarks: * orbital elements for (600217)2011 QY100 : Mean anomaly = 0.3426428981 deg Arg. of pericenter = 273.0384360867 deg Long. of node = 169.3463908584 deg Inclination = 26.2371432002 deg Eccentricity = 0.8864079657 Semimajor axis = 172.2405043980 AU Perihelion dist = 19.5651492781 AU Mag: H = 8.21, G = 0.15 Epoch of elements : MJD 59995.78361111 TDT (2023 Feb 20.7836) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#132021Nov10,5.37,2023,2,20,18.843780,0.996616,0.554935,-3.856164,6.929612,0.005296,0.001296,0.000001,-0.000001 20.3909,-2.5449,-99.23,-10.81,False UCAC4 438-014504,6.21342386,-2.5374036,0.00,14.62,0.00,0.0,0,,6.23286398,-2.5449385,6.77,0.00,0,0,1 600217,2011 QY100,21.39,75.5,19.2832,0,0,-0.118,3.16,,7.6 0,0.3423,2023,2,20,273.0384,169.3464,26.2371,0.88641,172.24050,19.56515,8.21,5.0,0.15 11.447,0.0593,0.0347,83,0.0564,Known errors,-1.00,-1,-1,-1 20230220_014504,59745.14 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 15, 03:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org