IOTA/IOTA-ES occultation update for (3626) Ohsaki / UCAC4 346-180725 event on 2024 Jul 16, 20:23 UT Visible from Summary ------- On 2024 Jul 16 UT, the 18.794550758753 km diameter asteroid (3626) Ohsaki will occult a 9.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.42 mag to 16.01 mag (the magnitude of the asteroid) for at most 1.850 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: 87 * date and approx. time of event: 2024 Jul 16, 20:13 - 2024 Jul 16, 20:33 * geocentric midpoint of event [JD]: 2460508.34944421 * magnitude of target star: 9.59 * magnitude drop [mag]: 6.42 * estimated maximum duration [s]: 1.850 * Moon: 77 % sunlit, 53° distance * Sun: 175° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.57 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.040, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.041", 0.003", 78°) * approx speed of asteroid's shadow [km/s]: 10.2064 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 346-180725 by 3626 Ohsaki on 2024 Jul 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 - 50 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -21 15 9 .... - 49 0 0 -21 25 45 20 32 53.4 1 112 3 -21 19 49 -21 31 40 -21 13 6 -21 38 24 .... - 48 0 0 -21 48 58 20 32 53.0 2 112 2 -21 43 2 -21 54 53 -21 36 19 -22 1 37 0.35 - 47 0 0 -22 12 7 20 32 52.5 3 111 1 -22 6 12 -22 18 3 -21 59 29 -22 24 47 0.36 - 46 0 0 -22 35 13 20 32 51.8 4 111 0 -22 29 18 -22 41 9 -22 22 35 -22 47 53 0.36 - 45 0 0 -22 58 15 20 32 50.9 5 111 -1 -22 52 19 -23 4 11 -22 45 36 -23 10 55 0.37 - 44 0 0 -23 21 12 20 32 49.8 6 110 -2 -23 15 16 -23 27 8 -23 8 33 -23 33 51 0.37 - 43 0 0 -23 44 3 20 32 48.5 7 110 -3 -23 38 8 -23 49 59 -23 31 25 -23 56 43 0.37 - 42 0 0 -24 6 49 20 32 47.0 8 109 -4 -24 0 54 -24 12 45 -23 54 11 -24 19 28 0.37 - 41 0 0 -24 29 28 20 32 45.3 9 109 -5 -24 23 33 -24 35 24 -24 16 50 -24 42 7 0.37 - 40 0 0 -24 52 1 20 32 43.4 10 109 -6 -24 46 6 -24 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-13 -22 25 14 -22 37 6 -22 18 32 -22 43 49 0.41 143 0 0 -22 8 9 20 13 37.0 8 251 -12 -22 2 14 -22 14 5 -21 55 31 -22 20 48 0.42 144 0 0 -21 45 5 20 13 35.4 7 250 -11 -21 39 9 -21 51 1 -21 32 27 -21 57 44 0.42 145 0 0 -21 21 57 20 13 34.1 6 250 -10 -21 16 2 -21 27 53 -21 9 19 -21 34 37 0.43 146 0 0 -20 58 47 20 13 33.0 5 250 -9 -20 52 52 -21 4 43 -20 46 9 -21 11 26 0.44 147 0 0 -20 35 35 20 13 32.1 4 249 -8 -20 29 40 -20 41 31 -20 22 58 -20 48 14 0.46 148 0 0 -20 12 22 20 13 31.4 3 249 -7 -20 6 27 -20 18 18 -19 59 44 -20 25 1 0.49 149 0 0 -19 49 8 20 13 30.9 2 248 -6 -19 43 13 -19 55 3 -19 36 30 -20 1 46 0.55 150 0 0 -19 25 53 20 13 30.6 1 248 -5 -19 19 58 -19 31 48 -19 13 16 -19 38 32 0.77 Uncertainty in time = +/- 5 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 346-180725 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 25 50.0425 DE: -20 56 02.374 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 25 50.0425 DE: -20 56 02.374 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.6 * B mag [mag]: 10.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3626) Ohsaki asteroid class: approx. diameter [km]: 19 approx. diameter ["]: 0.015 distance from Earth [AU]: 1.71590 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.041", 0.003", 77.65° remarks: * orbital elements for (3626)Ohsaki : Mean anomaly = 338.6271990146 deg Arg. of pericenter = 38.0092943849 deg Long. of node = 282.5449721811 deg Inclination = 4.0887056421 deg Eccentricity = 0.1493755154 Semimajor axis = 3.1577049408 AU Perihelion dist = 2.6860211379 AU Mag: H = 12.44, G = 0.15 Epoch of elements : MJD 60507.84944454 TDT (2024 Jul 16.8494) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,1.85,2024,7,16,20.386661,0.006708,-0.365153,-5.759818,-0.105422,0.000465,-0.000028,0.000001,0.000000 50.8653,-20.8851,-124.25,21.17,False UCAC4 346-180725,19.43056736,-20.9339926,10.15,9.59,9.29,0.1,0,,19.45513251,-20.8850813,6.42,6.27,0,0,0 3626,Ohsaki,16.01,18.919,1.7159,0,0,-2.106,-0.54,,1.6,0 0,338.4780,2024,7,16,38.0093,282.5450,4.0887,0.14938,3.15770,2.68602,12.44,5.0,0.15 1.567,0.0407,0.0033,78,0.0086,Known errors,1.03,0,-1,-1 20240716_180725,60140.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org