IOTA/IOTA-ES occultation update for (990) Yerkes / UCAC4 553-047018 event on 2024 Feb 02, 19:48 UT Visible from Summary ------- On 2024 Feb 02 UT, the 20.4642759402639 km diameter asteroid (990) Yerkes will occult a 11.6 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.51 mag to 16.11 mag (the magnitude of the asteroid) for at most 1.440 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: 99 * date and approx. time of event: 2024 Feb 02, 19:41 - 2024 Feb 02, 19:54 * geocentric midpoint of event [JD]: 2460343.32506904 * magnitude of target star: 11.62 * magnitude drop [mag]: 4.51 * estimated maximum duration [s]: 1.440 * Moon: 51 % sunlit, 78° distance * Sun: 167° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.002", 118°) * approx speed of asteroid's shadow [km/s]: 14.3461 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 553-047018 by 990 Yerkes on 2024 Feb 2 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 6 0 0 -14 50 37 19 54 29.7 1 69 -13 -14 43 40 -14 57 35 -14 40 47 -15 0 29 .... - 5 0 0 -14 28 33 19 54 29.6 2 69 -14 -14 21 37 -14 35 30 -14 18 44 -14 38 23 0.31 - 4 0 0 -14 6 52 19 54 29.2 3 68 -15 -13 59 57 -14 13 48 -13 57 4 -14 16 41 0.42 - 3 0 0 -13 45 35 19 54 28.7 4 68 -16 -13 38 40 -13 52 29 -13 35 48 -13 55 22 0.47 - 2 0 0 -13 24 41 19 54 28.1 5 68 -17 -13 17 48 -13 31 35 -13 14 56 -13 34 27 0.50 - 1 0 0 -13 4 12 19 54 27.2 6 68 -19 -12 57 20 -13 11 4 -12 54 28 -13 13 56 0.51 - 0 0 0 -12 44 7 19 54 26.2 7 67 -20 -12 37 16 -12 50 59 -12 34 25 -12 53 50 0.53 1 0 0 -12 24 28 19 54 25.1 8 67 -21 -12 17 38 -12 31 18 -12 14 47 -12 34 9 0.54 2 0 0 -12 5 13 19 54 23.8 9 67 -22 -11 58 24 -12 12 3 -11 55 34 -12 14 54 0.54 3 0 0 -11 46 25 19 54 22.3 10 67 -23 -11 39 36 -11 53 13 -11 36 46 -11 56 4 0.55 4 0 0 -11 28 2 19 54 20.7 11 66 -24 -11 21 14 -11 34 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19 41 41.0 1 298 6 -40 21 4 -40 35 42 -40 18 1 -40 38 45 0.66 152 0 0 -40 52 8 19 41 41.0 0 297 6 -40 44 50 -40 59 26 -40 41 47 -41 2 29 0.86 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: UCAC4 553-047018 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 54 15.6289 DE: +20 25 32.277 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 54 15.6296 DE: +20 25 32.279 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.6 * B mag [mag]: 13.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (990) Yerkes asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.014 distance from Earth [AU]: 2.05060 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 date of fit: 2023 Apr 27 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): 0.010", 0.002", 117.523° remarks: * orbital elements for (990)Yerkes : Mean anomaly = 117.3845395019 deg Arg. of pericenter = 9.2989704040 deg Long. of node = 353.9359828588 deg Inclination = 8.7866397515 deg Eccentricity = 0.2178612199 Semimajor axis = 2.6673013277 AU Perihelion dist = 2.0861998066 AU Mag: H = 11.77, G = 0.15 Epoch of elements : MJD 60342.82506891 TDT (2024 Feb 02.8251) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr27,1.44,2024,2,2,19.801657,-0.123841,-0.485175,-7.853942,1.970485,-0.001316,-0.000305,0.000001,-0.000001 79.3744,20.3106,-113.61,-16.78,False UCAC4 553-047018,9.90434136,20.4256325,12.98,11.62,10.89,0.1,4,,9.92698345,20.3105911,4.51,4.79,0,0,0 990,Yerkes,16.11,20.613,2.0506,0,0,-2.394,8.45,,1.4,0 0,117.1979,2024,2,2,9.2990,353.9360,8.7866,0.21786,2.66730,2.08620,11.78,5.0,0.15 1.208,0.0103,0.0017,118,0.0029,Known errors,1.03,0,-1,-1 20240202_047018,60138.15 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 03:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org