IOTA/IOTA-ES occultation update for 2013 SA87 / UCAC4 520-001598 event on 2022 Nov 14, 08:42 UT Visible from Summary ------- On 2022 Nov 14 UT, the 125.8 km diameter asteroid 2013 SA87 will occult a 13.1 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 9.97 mag to 23.10 mag (the magnitude of the asteroid) for at most 5.730 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]: 2459897.82660966 * magnitude of target star: 13.13 * magnitude drop [mag]: 9.97 * estimated maximum duration [s]: 5.730 * Moon: 71 % sunlit, 97° distance * Sun: 147° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 126 * 1 sigma uncertainty interval [path widths]: +/- 852.65 * 1 sigma uncertainty interval [seconds]: +/- 3265.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 4.271, +/- 1.842) * 1 sigma uncertainty ellipse (major, minor, PA): (4.558", 0.927", 111°) * approx speed of asteroid's shadow [km/s]: 21.9422 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: UCAC4 520-001598 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 58 29.8090 DE: +13 48 43.393 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 58 29.8089 DE: +13 48 43.392 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 13.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: 2013 SA87 asteroid class: TNO approx. diameter [km]: 126 approx. diameter ["]: 0.005 distance from Earth [AU]: 38.20520 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#10 date of fit: 2021 Apr 14 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): 4.558", 0.927", 110.9° remarks: * orbital elements for 2013 SA87 : Mean anomaly = 22.3636603735 deg Arg. of pericenter = 143.4155540976 deg Long. of node = 207.6031321812 deg Inclination = 40.6886357172 deg Eccentricity = 0.0775438426 Semimajor axis = 42.0082460115 AU Perihelion dist = 38.7507651968 AU Mag: H = 7.10, G = 0.15 Epoch of elements : MJD 59897.36250000 TDT (2022 Nov 14.3625) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#102021Apr14,5.73,2022,11,14,7.838632,-8.311550,11.249147,-9.958285,-7.363098,0.003291,0.000697,0.000001,0.000001 -156.0526,13.9365,58.52,-18.24,False UCAC4 520-001598,0.97494691,13.8120535,0.00,13.13,0.00,0.0,4,,0.99505758,13.9364758,9.97,0.00,0,0,0 0,2013 SA87,23.10,125.8,38.2052,0,0,-0.157,-1.69,,12.6,0 0,22.3623,2022,11,14,143.4156,207.6031,40.6886,0.07754,42.00825,38.75077,7.10,5.0,0.15 853.646,4.5583,0.9267,111,3.8710,Known errors,-1.00,-1,-1,-1 20221114_001598,59834.69 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Sep 12, 16:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org