IOTA/IOTA-ES occultation update for (37187) 2000 WP60 / UCAC4 345-085213 event on 2024 Sep 07, 14:44 UT Visible from Summary ------- On 2024 Sep 07 UT, the 13.456 km diameter asteroid (37187) 2000 WP60 will occult a 11.9 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 5.36 mag to 17.23 mag (the magnitude of the asteroid) for at most 0.650 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 Sep 07, 14:39 - 2024 Sep 07, 14:49 * geocentric midpoint of event [JD]: 2460561.11402870 * magnitude of target star: 11.88 * magnitude drop [mag]: 5.36 * estimated maximum duration [s]: 0.650 * Moon: 17 % sunlit, 40° distance * Sun: 89° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.003", 110°) * approx speed of asteroid's shadow [km/s]: 20.7131 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 345-085213 by 37187 2000 WP60 on 2024 Sep 7 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 - 33 0 0 24 19 8 14 39 5.4 1 114 70 24 15 8 24 23 7 24 13 12 24 25 3 .... - 32 0 0 23 54 58 14 39 5.5 2 114 70 23 50 59 23 58 58 23 49 2 24 0 54 0.03 - 31 0 0 23 30 22 14 39 5.7 3 114 70 23 26 21 23 34 22 23 24 25 23 36 19 -0.01 - 30 0 0 23 5 18 14 39 6.0 4 115 70 23 1 17 23 9 19 22 59 20 23 11 16 -0.03 - 29 0 0 22 39 47 14 39 6.4 5 115 70 22 35 45 22 43 49 22 33 48 22 45 46 -0.04 - 28 0 0 22 13 50 14 39 6.8 6 116 70 22 9 47 22 17 52 22 7 50 22 19 49 -0.04 - 27 0 0 21 47 25 14 39 7.4 7 116 69 21 43 23 21 51 28 21 41 25 21 53 26 -0.05 - 26 0 0 21 20 35 14 39 8.1 8 116 69 21 16 32 21 24 39 21 14 34 21 26 37 -0.05 - 25 0 0 20 53 19 14 39 8.9 9 117 69 20 49 15 20 57 23 20 47 17 20 59 21 -0.05 - 24 0 0 20 25 37 14 39 9.8 10 117 68 20 21 33 20 29 42 20 19 34 20 31 40 -0.05 - 23 0 0 19 57 30 14 39 10.8 11 117 68 19 53 25 20 1 36 19 51 26 20 3 34 -0.06 - 22 0 0 19 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: UCAC4 345-085213 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 51 30.0904 DE: -21 04 35.048 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 51 30.0903 DE: -21 04 35.048 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (37187) 2000 WP60 asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.011 distance from Earth [AU]: 1.76120 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 date of fit: 2023 Apr 25 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): 0.022", 0.003", 110.229° remarks: * orbital elements for (37187)2000 WP60 : Mean anomaly = 348.8138408489 deg Arg. of pericenter = 192.7890925200 deg Long. of node = 109.8287417251 deg Inclination = 12.2485864548 deg Eccentricity = 0.2395499876 Semimajor axis = 2.6196237735 AU Perihelion dist = 1.9920929310 AU Mag: H = 13.18, G = 0.15 Epoch of elements : MJD 60560.61402838 TDT (2024 Sep 07.6140) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr25,0.65,2024,9,7,14.736689,0.030179,0.076447,10.871521,-4.300132,0.005174,-0.000593,0.000000,0.000000 45.0218,-21.1188,-41.59,5.73,False UCAC4 345-085213,16.85835849,-21.0764024,12.61,11.88,11.49,0.0,0,,16.88275254,-21.1187615,5.36,5.30,0,0,0 37187,2000 WP60,17.23,13.456,1.7612,0,0,3.880,-21.47,,1.0,0 0,348.6711,2024,9,7,192.7891,109.8287,12.2486,0.23955,2.61962,1.99209,13.18,5.0,0.15 1.242,0.0223,0.0025,110,0.0026,Known errors,1.12,0,-1,-1 20240907_085213,60140.55 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org