IOTA/IOTA-ES occultation update for 2007 HV90 / UCAC4 337-095221 event on 2023 Mar 16, 08:43 UT Visible from Summary ------- On 2023 Mar 16 UT, the 158.5 km diameter asteroid 2007 HV90 will occult a 14.8 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.16 mag to 22.99 mag (the magnitude of the asteroid) for at most 50.270 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]: 2460019.89325875 * magnitude of target star: 14.83 * magnitude drop [mag]: 8.16 * estimated maximum duration [s]: 50.270 * Moon: 36 % sunlit, 21° distance * Sun: 94° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 159 * 1 sigma uncertainty interval [path widths]: +/- 48.59 * 1 sigma uncertainty interval [seconds]: +/- 11108.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 1.235, +/- 0.285) * 1 sigma uncertainty ellipse (major, minor, PA): (1.243", 0.250", 96°) * approx speed of asteroid's shadow [km/s]: 3.1530 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: UCAC4 337-095221 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 22 17.6395 DE: -22 41 36.388 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 22 17.6395 DE: -22 41 36.388 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 14.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: 2007 HV90 asteroid class: TNO approx. diameter [km]: 159 approx. diameter ["]: 0.005 distance from Earth [AU]: 41.71460 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#9 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): 1.243", 0.250", 96.456° remarks: * orbital elements for 2007 HV90 : Mean anomaly = 30.3527824886 deg Arg. of pericenter = 137.0833955477 deg Long. of node = 88.9451624487 deg Inclination = 2.9461060017 deg Eccentricity = 0.0576387503 Semimajor axis = 43.9348563558 AU Perihelion dist = 41.4025061406 AU Mag: H = 6.60, G = 0.15 Epoch of elements : MJD 60019.36347222 TDT (2023 Mar 16.3635) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#92021Apr15,50.27,2023,3,16,9.438210,0.090359,1.441538,1.776082,-0.112375,-0.006077,0.000382,0.000000,0.000000 -54.3661,-22.7163,40.61,-1.78,False UCAC4 337-095221,17.37156654,-22.6934410,0.00,14.83,0.00,0.0,0,,17.39476151,-22.7162542,8.16,0.00,0,0,0 0,2007 HV90,22.99,158.5,41.7146,0,0,0.029,-0.03,,15.8 0,30.3516,2023,3,16,137.0834,88.9452,2.9461,0.05764,43.93486,41.40251,6.60,5.0,0.15 49.595,1.2427,0.2503,96,0.2546,Known errors,-1.00,-1,-1,-1 20230316_095221,59744.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 14, 23:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org