IOTA/IOTA-ES occultation update for (4380) Geyer / TYC 7392-02226-1 event on 2024 Oct 24, 21:42 UT Visible from Summary ------- On 2024 Oct 24 UT, the 16.974 km diameter asteroid (4380) Geyer will occult a 10.7 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 7.33 mag to 18.01 mag (the magnitude of the asteroid) for at most 0.540 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: 98 * date and approx. time of event: 2024 Oct 24, 21:38 - 2024 Oct 24, 21:45 * geocentric midpoint of event [JD]: 2460608.40434433 * magnitude of target star: 10.68 * magnitude drop [mag]: 7.33 * estimated maximum duration [s]: 0.540 * Moon: 44 % sunlit, 143° distance * Sun: 61° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 83°) * approx speed of asteroid's shadow [km/s]: 31.2911 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7392-02226-1 by 4380 Geyer on 2024 Oct 24 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 -178 0 0 - 4 28 42 21 38 52.1 0 121 60 - 4 34 4 - 4 23 19 - 4 37 59 - 4 19 24 .... -177 0 0 - 5 4 37 21 38 52.1 1 121 61 - 5 9 59 - 4 59 14 - 5 13 53 - 4 55 20 0.07 -176 0 0 - 5 40 16 21 38 52.3 3 121 62 - 5 45 37 - 5 34 54 - 5 49 31 - 5 31 0 0.01 -175 0 0 - 6 15 38 21 38 52.5 4 121 63 - 6 20 59 - 6 10 17 - 6 24 53 - 6 6 24 -0.01 -174 0 0 - 6 50 43 21 38 52.8 5 121 64 - 6 56 3 - 6 45 23 - 6 59 56 - 6 41 29 -0.02 -173 0 0 - 7 25 29 21 38 53.2 6 120 66 - 7 30 49 - 7 20 9 - 7 34 41 - 7 16 16 -0.03 -172 0 0 - 7 59 55 21 38 53.7 7 120 67 - 8 5 14 - 7 54 36 - 8 9 6 - 7 50 44 -0.04 -171 0 0 - 8 34 1 21 38 54.2 8 120 68 - 8 39 19 - 8 28 43 - 8 43 11 - 8 24 51 -0.04 -170 0 0 - 9 7 45 21 38 54.9 10 120 69 - 9 13 3 - 9 2 28 - 9 16 54 - 8 58 37 -0.04 -169 0 0 - 9 41 7 21 38 55.6 11 120 70 - 9 46 24 - 9 35 51 - 9 50 15 - 9 32 0 -0.05 -168 0 0 -10 14 7 21 38 56.4 12 120 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44 54.4 38 237 -20 - 8 58 31 - 8 47 54 - 9 2 23 - 8 44 2 -0.06 - 36 0 0 - 8 19 2 21 44 56.9 37 237 -22 - 8 24 22 - 8 13 43 - 8 28 14 - 8 9 51 -0.06 - 35 0 0 - 7 44 31 21 44 59.4 36 237 -23 - 7 49 51 - 7 39 11 - 7 53 43 - 7 35 18 -0.06 - 34 0 0 - 7 9 38 21 45 1.8 35 237 -24 - 7 14 59 - 7 4 18 - 7 18 52 - 7 0 24 -0.06 - 33 0 0 - 6 34 26 21 45 4.1 34 237 -25 - 6 39 48 - 6 29 5 - 6 43 42 - 6 25 11 -0.06 - 32 0 0 - 5 58 56 21 45 6.4 33 237 -26 - 6 4 18 - 5 53 34 - 6 8 12 - 5 49 39 -0.06 - 31 0 0 - 5 23 7 21 45 8.6 31 237 -27 - 5 28 30 - 5 17 45 - 5 32 24 - 5 13 50 -0.06 - 30 0 0 - 4 47 2 21 45 10.7 30 237 -28 - 4 52 25 - 4 41 39 - 4 56 20 - 4 37 44 -0.06 - 29 0 0 - 4 10 41 21 45 12.8 29 237 -29 - 4 16 5 - 4 5 17 - 4 20 0 - 4 1 22 -0.06 - 28 0 0 - 3 34 6 21 45 14.8 28 237 -31 - 3 39 30 - 3 28 41 - 3 43 26 - 3 24 46 -0.06 - 27 0 0 - 2 57 17 21 45 16.7 27 237 -32 - 3 2 41 - 2 51 52 - 3 6 37 - 2 47 56 -0.06 - 26 0 0 - 2 20 15 21 45 18.6 26 237 -33 - 2 25 40 - 2 14 50 - 2 29 37 - 2 10 54 -0.06 - 25 0 0 - 1 43 3 21 45 20.4 24 237 -34 - 1 48 28 - 1 37 37 - 1 52 25 - 1 33 41 -0.06 - 24 0 0 - 1 5 40 21 45 22.1 23 237 -35 - 1 11 6 - 1 0 14 - 1 15 3 - 0 56 17 -0.06 - 23 0 0 - 0 28 9 21 45 23.7 22 237 -36 - 0 33 35 - 0 22 43 - 0 37 32 - 0 18 46 -0.06 - 22 0 0 0 9 30 21 45 25.3 21 237 -37 0 4 4 0 14 56 0 0 6 0 18 54 -0.06 - 21 0 0 0 47 15 21 45 26.7 20 237 -39 0 41 48 0 52 42 0 37 51 0 56 39 -0.06 - 20 0 0 1 25 5 21 45 28.1 19 237 -40 1 19 39 1 30 32 1 15 41 1 34 30 -0.06 - 19 0 0 2 2 59 21 45 29.4 17 237 -41 1 57 33 2 8 26 1 53 35 2 12 24 -0.06 - 18 0 0 2 40 56 21 45 30.6 16 237 -42 2 35 29 2 46 23 2 31 31 2 50 21 -0.05 - 17 0 0 3 18 54 21 45 31.8 15 237 -43 3 13 27 3 24 21 3 9 29 3 28 19 -0.05 - 16 0 0 3 56 52 21 45 32.8 14 237 -44 3 51 25 4 2 19 3 47 27 4 6 18 -0.05 - 15 0 0 4 34 49 21 45 33.8 13 237 -45 4 29 22 4 40 16 4 25 24 4 44 14 -0.05 - 14 0 0 5 12 43 21 45 34.6 11 237 -46 5 7 16 5 18 11 5 3 18 5 22 9 -0.05 - 13 0 0 5 50 34 21 45 35.4 10 237 -47 5 45 7 5 56 1 5 41 9 5 59 59 -0.05 - 12 0 0 6 28 20 21 45 36.1 9 237 -49 6 22 53 6 33 47 6 18 55 6 37 44 -0.05 - 11 0 0 7 5 59 21 45 36.7 8 237 -50 7 0 32 7 11 26 6 56 34 7 15 24 -0.05 - 10 0 0 7 43 31 21 45 37.3 7 238 -51 7 38 4 7 48 58 7 34 7 7 52 55 -0.04 - 9 0 0 8 20 54 21 45 37.7 6 238 -52 8 15 28 8 26 21 8 11 31 8 30 18 -0.04 - 8 0 0 8 58 8 21 45 38.1 4 238 -53 8 52 42 9 3 34 8 48 45 9 7 31 -0.03 - 7 0 0 9 35 11 21 45 38.4 3 238 -54 9 29 45 9 40 37 9 25 48 9 44 34 -0.02 - 6 0 0 10 12 2 21 45 38.5 2 238 -55 10 6 36 10 17 27 10 2 39 10 21 24 0.00 - 5 0 0 10 48 39 21 45 38.6 1 238 -56 10 43 14 10 54 4 10 39 18 10 58 1 0.09 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 7392-02226-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 09 32.4369 DE: -30 51 06.070 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 09 32.4368 DE: -30 51 06.070 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.7 * B mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4380) Geyer asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.44740 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 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): 0.013", 0.002", 83.077° remarks: * orbital elements for (4380)Geyer : Mean anomaly = 259.7684228266 deg Arg. of pericenter = 49.7974659948 deg Long. of node = 345.5446427058 deg Inclination = 9.8747659778 deg Eccentricity = 0.0628530809 Semimajor axis = 3.0399279163 AU Perihelion dist = 2.8488590809 AU Mag: H = 12.01, G = 0.15 Epoch of elements : MJD 60607.90434417 TDT (2024 Oct 24.9043) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,0.54,2024,10,24,21.704264,-0.011219,0.069754,17.442124,2.775454,0.005147,-0.000275,-0.000001,0.000000 -86.5632,-30.8487,-149.54,-12.16,False TYC 7392-02226-1,18.15901028,-30.8516860,10.84,10.68,10.59,0.0,0,,18.18542858,-30.8487392,7.33,6.97,0,0,0 4380,Geyer,18.01,16.974,3.4474,0,0,3.455,7.08,,2.0,0 0,259.6003,2024,10,24,49.7975,345.5446,9.8748,0.06285,3.03993,2.84886,12.00,5.0,0.15 1.364,0.0130,0.0024,83,0.0025,Known errors,0.64,0,-1,-1 20241024_2226-1,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org