IOTA/IOTA-ES occultation update for (880) Herba / UCAC4 416-053200 event on 2024 Jul 05, 17:55 UT Visible from Summary ------- On 2024 Jul 05 UT, the 30.517 km diameter asteroid (880) Herba will occult a 11.5 mag star in the constellation Sextans for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.80 mag to 18.31 mag (the magnitude of the asteroid) for at most 1.140 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 Jul 05, 17:51 - 2024 Jul 05, 17:59 * geocentric midpoint of event [JD]: 2460497.24708263 * magnitude of target star: 11.51 * magnitude drop [mag]: 6.80 * estimated maximum duration [s]: 1.140 * Moon: 0 % sunlit, 67° distance * Sun: 63° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 118°) * approx speed of asteroid's shadow [km/s]: 26.6674 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 416-053200 by 880 Herba on 2024 Jul 5 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 -121 0 0 - 6 48 14 17 51 59.4 0 97 45 - 6 56 59 - 6 39 30 - 7 2 54 - 6 33 35 .... -120 0 0 - 6 55 56 17 51 59.5 1 97 46 - 7 4 41 - 6 47 12 - 7 10 37 - 6 41 17 0.24 -119 0 0 - 7 3 51 17 51 59.7 2 97 47 - 7 12 36 - 6 55 6 - 7 18 32 - 6 49 11 0.27 -118 0 0 - 7 11 57 17 51 59.9 3 97 47 - 7 20 42 - 7 3 12 - 7 26 39 - 6 57 17 0.28 -117 0 0 - 7 20 15 17 52 0.2 4 97 48 - 7 29 1 - 7 11 30 - 7 34 57 - 7 5 34 0.29 -116 0 0 - 7 28 45 17 52 0.6 5 96 48 - 7 37 30 - 7 20 0 - 7 43 27 - 7 14 4 0.29 -115 0 0 - 7 37 26 17 52 1.0 6 96 49 - 7 46 12 - 7 28 40 - 7 52 9 - 7 22 44 0.29 -114 0 0 - 7 46 18 17 52 1.5 7 96 50 - 7 55 5 - 7 37 33 - 8 1 2 - 7 31 36 0.30 -113 0 0 - 7 55 22 17 52 2.1 8 96 50 - 8 4 8 - 7 46 36 - 8 10 6 - 7 40 39 0.30 -112 0 0 - 8 4 37 17 52 2.8 9 96 51 - 8 13 23 - 7 55 50 - 8 19 21 - 7 49 54 0.30 -111 0 0 - 8 14 2 17 52 3.6 10 96 51 - 8 22 49 - 8 5 16 - 8 28 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4 0 -28 34 50 0.32 48 0 0 -28 44 29 17 59 31.2 12 268 -51 -28 53 11 -28 35 48 -28 59 5 -28 29 54 0.32 49 0 0 -28 39 21 17 59 32.0 11 268 -52 -28 48 3 -28 30 40 -28 53 57 -28 24 46 0.33 50 0 0 -28 34 2 17 59 32.7 10 267 -52 -28 42 44 -28 25 20 -28 48 38 -28 19 26 0.33 51 0 0 -28 28 31 17 59 33.3 9 267 -53 -28 37 13 -28 19 49 -28 43 8 -28 13 55 0.33 52 0 0 -28 22 48 17 59 33.9 8 266 -54 -28 31 30 -28 14 6 -28 37 25 -28 8 12 0.33 53 0 0 -28 16 53 17 59 34.4 7 266 -55 -28 25 36 -28 8 11 -28 31 31 -28 2 17 0.33 54 0 0 -28 10 48 17 59 34.9 6 265 -56 -28 19 31 -28 2 5 -28 25 26 -27 56 11 0.34 55 0 0 -28 4 30 17 59 35.3 6 265 -57 -28 13 14 -27 55 48 -28 19 9 -27 49 53 0.34 56 0 0 -27 58 2 17 59 35.6 5 264 -58 -28 6 45 -27 49 19 -28 12 41 -27 43 24 0.35 57 0 0 -27 51 22 17 59 35.9 4 264 -59 -28 0 6 -27 42 39 -28 6 1 -27 36 44 0.36 58 0 0 -27 44 31 17 59 36.2 3 263 -59 -27 53 15 -27 35 48 -27 59 11 -27 29 53 0.38 59 0 0 -27 37 29 17 59 36.3 2 263 -60 -27 46 13 -27 28 45 -27 52 9 -27 22 50 0.41 60 0 0 -27 30 16 17 59 36.4 1 263 -61 -27 39 1 -27 21 32 -27 44 56 -27 15 37 0.49 61 0 0 -27 22 52 17 59 36.5 0 262 -62 -27 31 37 -27 14 8 -27 37 33 -27 8 13 1.51 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 416-053200 * constellation : Sextans * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 10 45 19.1359 DE: -06 58 01.612 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 10 45 19.1359 DE: -06 58 01.612 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (880) Herba asteroid class: approx. diameter [km]: 31 approx. diameter ["]: 0.010 distance from Earth [AU]: 4.32620 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): 0.009", 0.002", 117.654° remarks: * orbital elements for (880)Herba : Mean anomaly = 171.4071760815 deg Arg. of pericenter = 100.8937681791 deg Long. of node = 262.5608741047 deg Inclination = 15.1368588843 deg Eccentricity = 0.3227124383 Semimajor axis = 2.9994771802 AU Perihelion dist = 2.0315085858 AU Mag: H = 11.37, G = 0.15 Epoch of elements : MJD 60496.74708279 TDT (2024 Jul 05.7471) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,1.14,2024,7,5,17.929983,-0.053083,-0.288988,14.807888,-2.698990,0.004419,-0.002573,-0.000001,0.000000 -31.5339,-7.0956,-87.76,22.68,False UCAC4 416-053200,10.75531556,-6.9671148,12.04,11.51,11.22,0.0,0,,10.77564052,-7.0955561,6.80,6.64,0,0,0 880,Herba,18.31,30.517,4.3262,0,0,2.023,-5.49,,1.8,0 0,171.2654,2024,7,5,100.8938,262.5609,15.1369,0.32271,2.99948,2.03151,11.37,5.0,0.15 1.339,0.0093,0.0019,118,0.0033,Known errors,0.93,0,-1,-1 20240705_053200,60140.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org