IOTA/IOTA-ES occultation update for (1437) Diomedes / TYC 824-00995-1 event on 2024 Feb 20, 00:29 UT Visible from Summary ------- On 2024 Feb 20 UT, the 144.239 km diameter asteroid (1437) Diomedes will occult a 9.8 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 5.31 mag to 15.06 mag (the magnitude of the asteroid) for at most 8.060 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 20, 00:23 - 2024 Feb 20, 00:34 * geocentric midpoint of event [JD]: 2460360.52015354 * magnitude of target star: 9.76 * magnitude drop [mag]: 5.31 * estimated maximum duration [s]: 8.060 * Moon: 82 % sunlit, 44° distance * Sun: 171° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 168 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.006", 131°) * approx speed of asteroid's shadow [km/s]: 17.8969 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 824-00995-1 by 1437 Diomedes on 2024 Feb 20 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 - 99 0 0 .. .. .... .. .. .. .. .. .. -25 0 42 .. .. .. -24 37 32 .. .. .. .... - 98 0 0 -25 36 14 0 34 7.4 1 78 7 -24 49 55 -26 22 55 -24 26 46 -26 46 34 .... - 97 0 0 -25 25 32 0 34 7.3 2 78 6 -24 39 14 -26 12 12 -24 16 5 -26 35 50 0.40 - 96 0 0 -25 14 57 0 34 7.0 3 77 6 -24 28 40 -26 1 36 -24 5 32 -26 25 13 0.47 - 95 0 0 -25 4 28 0 34 6.6 4 77 5 -24 18 13 -25 51 6 -23 55 5 -26 14 42 0.50 - 94 0 0 -24 54 6 0 34 6.2 5 77 4 -24 7 52 -25 40 43 -23 44 45 -26 4 18 0.52 - 93 0 0 -24 43 52 0 34 5.6 5 76 3 -23 57 39 -25 30 27 -23 34 33 -25 54 2 0.53 - 92 0 0 -24 33 44 0 34 4.9 6 76 2 -23 47 33 -25 20 18 -23 24 27 -25 43 53 0.54 - 91 0 0 -24 23 45 0 34 4.1 7 75 1 -23 37 35 -25 10 17 -23 14 30 -25 33 51 0.55 - 90 0 0 -24 13 53 0 34 3.2 8 75 0 -23 27 44 -25 0 24 -23 4 40 -25 23 57 0.56 - 89 0 0 -24 4 9 0 34 2.2 9 75 -1 -23 18 1 -24 50 39 -22 54 58 -25 14 11 0.56 - 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35 -35 38 56 -33 42 21 -36 2 40 0.96 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: TYC 824-00995-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 35 10.2116 DE: +10 15 41.611 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 35 10.2115 DE: +10 15 41.611 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.8 * B mag [mag]: 9.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1437) Diomedes asteroid class: approx. diameter [km]: 144 approx. diameter ["]: 0.048 distance from Earth [AU]: 4.11000 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#88 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): 0.019", 0.006", 131.158° remarks: * orbital elements for (1437)Diomedes : Mean anomaly = 54.8300419215 deg Arg. of pericenter = 129.7045389935 deg Long. of node = 315.7942668702 deg Inclination = 20.4628596404 deg Eccentricity = 0.0462369357 Semimajor axis = 5.2207053045 AU Perihelion dist = 4.9793158892 AU Mag: H = 8.24, G = 0.15 Epoch of elements : MJD 60360.02015354 TDT (2024 Feb 20.0202) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#882023Apr24,8.06,2024,2,20,0.483685,-0.041470,-0.509036,-10.067916,0.822875,0.000936,0.000110,0.000001,0.000000 -12.5883,10.1528,176.20,-11.17,False TYC 824-00995-1,9.58616988,10.2615586,9.94,9.76,9.66,0.0,4,,9.60805502,10.1528191,5.30,4.95,0,0,0 1437,Diomedes,15.06,144.239,4.1100,0,0,-1.458,1.76,,7.8,0 0,54.7458,2024,2,19,129.7045,315.7943,20.4629,0.04624,5.22071,4.97932,8.24,5.0,0.15 1.252,0.0190,0.0057,131,0.0122,Known errors,0.92,0,-1,-1 20240220_0995-1,60138.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 04:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org