IOTA/IOTA-ES occultation update for 2011 HO60 / UCAC4 230-107628 event on 2023 Jun 19, 04:25 UT Visible from Summary ------- On 2023 Jun 19 UT, the 190.5 km diameter asteroid 2011 HO60 will occult a 13.5 mag star in the constellation Norma for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.51 mag to 21.98 mag (the magnitude of the asteroid) for at most 8.580 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: 1 * date and approx. time of event: predicted path center does not land on Earth. * geocentric midpoint of event [JD]: 2460114.66740000 * magnitude of target star: 13.47 * magnitude drop [mag]: 8.51 * estimated maximum duration [s]: 8.580 * Moon: 1 % sunlit, 147° distance * Sun: 153° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 191 * 1 sigma uncertainty interval [path widths]: +/- 38.38 * 1 sigma uncertainty interval [seconds]: +/- 1724.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 1.405, +/- 0.462) * 1 sigma uncertainty ellipse (major, minor, PA): (1.454", 0.274", 105°) * approx speed of asteroid's shadow [km/s]: 22.2083 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: UCAC4 230-107628 * constellation : Norma * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 20 45.1636 DE: -44 11 44.298 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 20 45.1636 DE: -44 11 44.298 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 13.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: 2011 HO60 asteroid class: Centaur approx. diameter [km]: 191 approx. diameter ["]: 0.007 distance from Earth [AU]: 36.32750 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#6 date of fit: 2021 Apr 15 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): 1.454", 0.274", 105.088° remarks: * orbital elements for 2011 HO60 : Mean anomaly = 3.2810194135 deg Arg. of pericenter = 242.3323330601 deg Long. of node = 353.3477924450 deg Inclination = 22.2360230823 deg Eccentricity = 0.6064740819 Semimajor axis = 93.1137183835 AU Perihelion dist = 36.6426615164 AU Mag: H = 6.20, G = 0.15 Epoch of elements : MJD 60114.18465278 TDT (2023 Jun 19.1847) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#62021Apr15,8.58,2023,6,19,4.017600,0.611562,2.006571,-11.990305,3.654913,0.002008,0.001813,0.000001,0.000000 -81.7848,-44.2530,120.06,23.42,False UCAC4 230-107628,16.34587878,-44.1956383,0.00,13.47,0.00,0.0,0,,16.37384986,-44.2529673,8.51,0.00,0,0,0 0,2011 HO60,21.98,190.5,36.3275,0,0,-0.270,0.88,,19.1 0,3.2808,2023,6,19,242.3323,353.3478,22.2360,0.60647,93.11372,36.64266,6.20,5.0,0.15 39.385,1.4537,0.2740,105,0.2775,Known errors,-1.00,-1,-1,-1 20230619_107628,59745.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 15, 04:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org