IOTA/IOTA-ES occultation update for (2505) Hebei / UCAC4 327-110988 event on 2024 Oct 16, 12:42 UT Visible from Summary ------- On 2024 Oct 16 UT, the 23.5283723174055 km diameter asteroid (2505) Hebei will occult a 11.7 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 5.49 mag to 17.17 mag (the magnitude of the asteroid) for at most 0.720 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 Oct 16, 12:39 - 2024 Oct 16, 12:45 * geocentric midpoint of event [JD]: 2460600.02943271 * magnitude of target star: 11.69 * magnitude drop [mag]: 5.49 * estimated maximum duration [s]: 0.720 * Moon: 99 % sunlit, 104° distance * Sun: 63° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.001", 94°) * approx speed of asteroid's shadow [km/s]: 33.1303 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 327-110988 by 2505 Hebei on 2024 Oct 16 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 - 38 0 0 2 48 44 12 39 10.6 0 115 63 2 41 39 2 55 50 2 39 38 2 57 50 .... - 37 0 0 2 20 53 12 39 10.6 1 115 64 2 13 47 2 27 58 2 11 47 2 29 59 0.11 - 36 0 0 1 52 59 12 39 10.8 2 115 65 1 45 53 2 0 5 1 43 53 2 2 5 0.05 - 35 0 0 1 25 4 12 39 10.9 3 115 66 1 17 58 1 32 10 1 15 57 1 34 10 0.03 - 34 0 0 0 57 8 12 39 11.2 5 115 67 0 50 2 1 4 14 0 48 2 1 6 14 0.02 - 33 0 0 0 29 12 12 39 11.5 6 115 68 0 22 6 0 36 18 0 20 6 0 38 18 0.01 - 32 0 0 0 1 17 12 39 11.9 7 115 69 - 0 5 48 0 8 23 - 0 7 49 0 10 24 0.00 - 31 0 0 - 0 26 36 12 39 12.4 8 115 70 - 0 33 41 - 0 19 30 - 0 35 42 - 0 17 30 0.00 - 30 0 0 - 0 54 27 12 39 12.9 9 115 72 - 1 1 32 - 0 47 21 - 1 3 32 - 0 45 21 0.00 - 29 0 0 - 1 22 14 12 39 13.5 10 115 73 - 1 29 20 - 1 15 9 - 1 31 20 - 1 13 9 0.00 - 28 0 0 - 1 49 58 12 39 14.2 11 115 74 - 1 57 4 - 1 42 53 - 1 59 4 - 1 40 53 -0.01 - 27 0 0 - 2 17 38 12 39 15.0 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 327-110988 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 42 09.3409 DE: -24 43 29.029 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 42 09.3408 DE: -24 43 29.029 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2505) Hebei asteroid class: approx. diameter [km]: 24 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.93170 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 date of fit: 2023 Apr 24 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): 0.020", 0.001", 94.299° remarks: * orbital elements for (2505)Hebei : Mean anomaly = 13.8250445888 deg Arg. of pericenter = 206.6937012716 deg Long. of node = 59.2277206096 deg Inclination = 2.0771136140 deg Eccentricity = 0.1718951213 Semimajor axis = 3.1455196889 AU Perihelion dist = 2.6048202003 AU Mag: H = 11.75, G = 0.15 Epoch of elements : MJD 60599.52943242 TDT (2024 Oct 16.5294) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,0.72,2024,10,16,12.706385,0.000379,0.025133,18.691594,-0.549330,0.005051,-0.000206,-0.000001,0.000000 49.7944,-24.7377,-14.23,-9.18,False UCAC4 327-110988,17.70259473,-24.7247302,12.93,11.69,11.02,0.1,0,,17.72773404,-24.7376784,5.49,5.71,0,0,0 2505,Hebei,17.17,23.741,2.9317,0,0,4.115,-1.64,,1.2,0 0,13.7315,2024,10,16,206.6937,59.2277,2.0771,0.17190,3.14552,2.60482,11.75,5.0,0.15 1.141,0.0203,0.0013,94,0.0016,Known errors,0.67,0,-1,-1 20241016_110988,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org