IOTA/IOTA-ES occultation update for 2015 VR165 / UCAC4 555-008657 event on 2023 Nov 02, 19:38 UT Visible from Summary ------- On 2023 Nov 02 UT, the 60.3 km diameter asteroid 2015 VR165 will occult a 12.8 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 11.76 mag to 24.60 mag (the magnitude of the asteroid) for at most 2.600 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]: 2460251.33357929 * magnitude of target star: 12.84 * magnitude drop [mag]: 11.76 * estimated maximum duration [s]: 2.600 * Moon: 73 % sunlit, 40° distance * Sun: 157° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 60 * 1 sigma uncertainty interval [path widths]: +/- 1308.47 * 1 sigma uncertainty interval [seconds]: +/- 11821.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 9.504, +/- 4.275) * 1 sigma uncertainty ellipse (major, minor, PA): (10.367", 1.056", 66°) * approx speed of asteroid's shadow [km/s]: 23.1406 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: UCAC4 555-008657 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 01 00.5751 DE: +20 48 23.178 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 01 00.5752 DE: +20 48 23.178 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: 2015 VR165 asteroid class: TNO approx. diameter [km]: 60 approx. diameter ["]: 0.002 distance from Earth [AU]: 37.49130 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#2 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): 10.367", 1.056", 66.318° remarks: * orbital elements for 2015 VR165 : Mean anomaly = 45.7100258468 deg Arg. of pericenter = 310.6224564283 deg Long. of node = 61.0370185402 deg Inclination = 12.6952866092 deg Eccentricity = 0.0518345134 Semimajor axis = 39.7905575369 AU Perihelion dist = 37.7280333483 AU Mag: H = 8.70, G = 0.15 Epoch of elements : MJD 60250.81847222 TDT (2023 Nov 02.8185) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#22021Apr15,2.60,2023,11,2,20.005903,-0.157175,1.050630,-12.917316,-1.933551,-0.002318,-0.000482,0.000001,0.000000 78.6827,20.8745,-124.20,-14.86,False UCAC4 555-008657,4.01682643,20.8064384,0.00,12.84,0.00,0.0,0,,4.04030143,20.8745355,11.75,0.00,0,0,0 0,2015 VR165,24.60,60.3,37.4913,0,0,-0.215,-0.45,,6.0 0,45.7068,2023,11,2,310.6225,61.0370,12.6953,0.05183,39.79056,37.72803,8.70,5.0,0.15 1309.469,10.3673,1.0560,66,2.9017,Known errors,-1.00,-1,-1,-1 20231102_008657,59745.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 15, 05:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org