The Minor Planet Bulletin BULLETIN OF THE MINOR PLANETS SECTION OF THE ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS
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The Minor Planet Bulletin is the journal for almost all amateurs and even some professionals for publishing
asteroid photometry results, including lightcurves, H-G parameters, color indexes, and shape/spin axis models.
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Rotation Period and Lightcurve Analysis of 4510 Shawna
Pages 93-94 Lombardi, Alexandra; Armstrong, James D.
Photometric observations of asteroid 4510 Shawna were obtained in October and November of 2024. We found a period of rotation P = 20.1 ± 0.04 h.
Rotation Period and a New Dense Lightcurve of 168 Sibylla
Pages 95 Pilcher, Frederick; Benishek, Vladimir
Photometric lightcurves of minor planet 168 Sibylla 2025 Aug. 26 - Nov. 9 show a synodic rotation period 47.016 ± 0.002 h, amplitude 0.18 ± 0.01 mag with an asymmetric and somewhat irregular bimodal lightcurve.
New Lightcurves and a Tentative Rotation Period of Tumbling Asteroid 571 Dulcinea
We find for tumbling asteroid 571 Dulcinea a principal rotation period of 190 ± 1 hours with a second period too close to commensurate to be separately found. The full lightcurve amplitude is 0.7 magnitudes.
Rotation Period and a New Dense Lightcurve of 702 Alauda
Pages 98-99 Pilcher, Frederick
Minor planet 702 Alauda has a synodic rotation period 16.706 ± 0.001 h, amplitude 0.12 ± 0.01 mag with a somewhat irregular and asymmetric bimodal lightcurve.
Photometric Observations of Asteroids 2484 Parenago, 3807 Pagels, and 7631 Vokrouhlicky
Photometric observations of three main-belt asteroids were conducted to verify or determine their synodic rotation periods. For 2484 Parenago, we found P = 3.430 ± 0.002 h with A = 0.38 ± 0.04 mag. For 3807 Pagels, we found P = 3.287 ± 0.001 h with A = 0.10 ± 0.02 mag. For 7631 Vokrouhlicky, we present a preliminary solution with P = 75.24 ± 0.24 h with A = 0.56 ± 0.05 mag.
Lightcurve and Rotation Period Analysis of 1984 Fedynskij, 2451 Dollfus and 4583 Lugo
Pages 102-104 Hawley, Wayne; Brincat, Stephen M; Haymes, Tim; Odeh, Mohammad; Leyland, Paul C.; Wiggins, Patrick; Kardasis, Emmanuel; Scott, Brian; DeGroff, Kent; Gout, Jean-Francois
Photometric observations of asteroid 1984 Fedynskij, 2451 Dollfus and 4583 Lugo were obtained during 2025 Aug-Sep. Photometry and period determination were carried out with TychoTracker Pro Version 12.6.1. (TT). The photometric analysis was performed using standard differential techniques on images with the comparison stars employed selected by TT to be within the colour range of +0.50 < (B-V) < +0.90.
Photometry of Known Binary Asteroid 26471 Tracybecker
Pages 105-106 Polakis, Tom
Photometric measurements were made for binary asteroid 26471 Tracybecker using CCD observations made during 2025 September and October. Mutual events were detected, and rotation and orbital periods were determined. All the data have been submitted to the ALCDEF database.
Lightcurves, Synodic Rotation Period, Phase Curve, Spectral Classification and Color Index V-R of Trojan Asteroid (2893) Peiroos
Pages 107-111 Taube, Alexander; Melita, Mario Daniel; Huanca, Eduardo Luis Tello; Gomes, Eugenia Noel
We present an updated estimate for the synodic rotation period (P) and the lightcurve amplitudes for each observation epoch of the Jupiter Trojan asteroid 2893 Peiroos (preliminary designation 1975 QD). We compared the spectral slope of 2893 Peiroos with that associated to a classical D-type asteroid, reaffirming its taxonomic classification. The color index V-R was also updated for the observation epochs 2011.5 and 2023.8 and the estimates were used to analyze its compatibility with the D spectral class inside the L5 Trojan population.
Lightcurve and Rotation Period Analysis of 8556 Jana
Photometric observations of asteroid 8556 Jana were obtained 2025 September-November. For 8556 Jana, we found P = 35.52 ± 0.01 h, A = 0.5354 ± 0.0364 magnitudes. A search of the LCDB and Minor Planet Bulletin found no earlier periods reported.
Lightcurve and Rotation Period Analysis of 2387 Xi’an
Photometric observations of asteroid 2387 Xi’an were obtained during 2025 August. We found P = 4.2971 ± 0.001 h, A = 0.2087 ± 0.0215 magnitudes. Two earlier results were found in the Lightcurve Database, Waszczak et al. (2015) and Durech et al. (2020).
Lightcurve and Rotation Period Analysis of 2990 Trimberger
Pages 116-117 Hawley, Wayne; Wiggins, Patrick; Gout, Jean-Francois; DeGroff, Kent
Photometric observations of asteroid 2990 Trimberger were obtained during 2025 December. We found P = 7.787 ± 0.003 h, A = 0.898 ± 0.064 magnitudes. This agrees with the previously published result by Erasmus et al. (2020).
Lightcurve and Rotation Period Analysis of 4382 Stravinsky
Photometric observations of asteroid 4382 Stravinsky were obtained during 2025 Sep - Dec. For 4382 Stravinsky, we found P = 12.20 ± 0.01 h, A = 0.1339 ± 0.0309 magnitudes. Ïurech et al. (2019) reports a period of 12.19702 h.
Lightcurve and Rotation Period Analysis f Asteroids 1354 Botha and 6514 Torahiko
Photometric observations of asteroid 1354 Botha were obtained during 2025 Sep-Nov. Photometric observations of asteroid 6514 Torahiko were obtained during 2025 Nov-Dec.
Lightcurves and Rotation Periods of Four Main-Belt Asteroids
During 2025 June through October, photometric observations of several main-belt asteroids were obtained primarily with the 0.40m f/10 Meade ACF telescope, SBIG ST10-XME and Moravian G4-9000 CCD camera (clear filter) at Civico Osservatorio Astronomico di Rozzano (D66). Typical exposures were 90-120-180s, guided, and calibrated with dark and flat frames. Tycho Tracker was used for image alignment and calibration; MPO Canopus performed differential photometry and Fourier period analysis.
Lightcurve and Rotation Periods for 6422 Akagi and 7723 Lugger
Pages 125-126 Fauerbach, Michael; Lucas, Michael P.
Photometric observations of Eunomia family member 6422 Akagi and Mars-crossing asteroid 7723 Lugger were obtained to verify their synodic rotation periods. We found: 6422 Akagi P = 7.795±0.001 h with A = 0.92±0.05 mag; 7723 Lugger P = 4.835±0.001 h with A = 0.36 ±0.02 mag.
Discovery and Photometric-Spectroscopic Studies of Apollo Asteroid 2024 QS
Pages 127-128 Romanov, Filipp Dmitrievich; Farina, Andrea; Erasmus, Nicolas Abdelaziz, Ahmed Magdy; Hendy, Yasser Hassan; Kamel, Tarek Mahmoud
This paper describes the discovery and presents the results of photometric and spectroscopic studies of the Apollo Near-Earth asteroid 2024 QS from 2024 September 3 to 8 using the telescopes of three observatories. 2024 QS appears most likely to be classified within the C-complex or X-complex, and the rotation period was determined to be 5.58 hours with an amplitude of 0.5 mag.
Lightcurve and Rotation Period of 2025 FA22
Pages 129 Nath, Arushi
Photometric observations of the potentially hazardous asteroid 2025 FA22 were obtained on six nights during its close approach in September 2025. Analysis of R-band lightcurves yields a synodic rotation period of 13.075 ± 0.002 h with a peak-to-peak amplitude of 0.62 mag, implying a significantly elongated shape with a minimum equatorial axis ratio of a/b > 1.77. Rotation corrected BVRI photometry indicates moderately red colors consistent with an S-complex taxonomic classification.
Collaborative Asteroid Photometry rom UAI: 2025 October-December
Photometric observations of three asteroids were made in order to acquire lightcurves for shape/spin axis modeling. Lightcurves were acquired for 1346 Gotha, 1551 Argelander, and 4807 Noboru.
Photometry of 21 Asteroids at Sopot Astronomical Observatory: 2025 June - December
Pages 133-138 Benishek, Vladimir
Lightcurves and synodic rotation periods for 21 asteroids obtained from photometric data collected at the Sopot Astronomical Observatory in the time span 2025 June- December. For a large portion of the asteroids included, synodic rotation periods were derived for the first time.
Review and Study of the Lightcurves and Rotation Periods of 10 Asteroids
Pages 139-142 Farfán, Rafael González; Lorenz, Esteban Reina; Albá, Carlos Botana; De Elías Cantalapiedra, Javier; Fernández, Javier Ruiz; Martínez, Fernando Limón; Andújar, José María Fernández; Ruiz, Javier Polancos
In this paper, we present the results of the study and monitoring of the lightcurves and rotation periods of 10 asteroids. In some cases, these studies confirmed data previously obtained in earlier observations, while in others, we present new results, which we hope will be confirmed (or not) by subsequent observations.
Lightcurve Analysis for Four Main-Belt, one Near-Earth, and one Potentially Hazardous Asteroid
Photometric observations for four main-belt, one near- Earth, and one potentially hazardous asteroid. We derived the following synodic rotation periods: 1717 Arlon, 5.2269 ± 0.0001 h; 19122 Amandabosh, 7.8132 ± 0.0024 h; 24641 Enver, 9.0498 ± 0.0019 h; (23576) 1995 DZ3, 4.2947 ± 0.0005 h; (612356) 2002 JX8, 3.33720 ± 0.00044 h; 2025 FA22, 13.017 ± 0.002 h.
Photometric Observations and Lightcurve Analysis of 5 Main-Belt Asteroids from ASPIRE Collaboration
Pages 145-147 Galdies, Charles; Brincat, Stephen M.; Bucek, Marek; Zammit, Vincent
We present CCD photometric observations of five mainbelt asteroids obtained from three observatories in Malta and one in Slovakia during twenty-one nights between December 2023 and January 2024. The targets were (1146) Biarmia, (4460) Bihoro, (4602) Heudier, (7572) Znokai and (57518) 2001 SB286. Derived synodic rotation periods are 5.4708 ± 0.0005 h, 6.2599 ± 0.0046 h, 2.7196 ± 0.0036 h, 5.9253 ± 0.0076 h, and 2.8064 ± 0.0033 h, with amplitudes between 0.09 and 0.15 mag.
Photometric Observations and Lightcurve Analysis of (2600) Lumme, (3667) Anne-Marie, (11861) Teruhime, (26328) Litomysl, and (5480) 1989 YK8
Pages 148-149 Galdies, Charles; Brincat, Stephen M.; Bucek, Marek; Zammit, Vincent
We present CCD photometric observations of five mainbelt asteroids: (2600) Lumme, (3667) Anne-Marie, (11861) Teruhime, (26328) Litomysl, and (5480) 1989 YK8. Our results were obtained from four observatories in Malta and Slovakia during the period January 2024 to May 2025. Observations were performed over 27 nights using small Schmidt-Cassegrain telescopes equipped with CCD cameras. The resulting lightcurves yielded synodic rotation periods ranging from 4.6802 h to 15.5437 h with amplitudes between 0.09 and 0.95 mag. These data contribute new or refined period determinations for several objects, expanding the photometric record of main-belt asteroids.
Lightcurve Analysis for Twenty Main-belt Asteroids
Synodic rotation periods and amplitudes are reported for 1068 Nofretete, 1818 Brahms, 1942 Jablunka, 2097 Galle, 2098 Zyskin, 2125 Karl-Ontjes, 3237 Victorplatt, 4583 Lugo, 5256 Farquhar, 7842 Ishitsuka, 8556 Jana, (11564) 1993 FU41, (16009) 1999 CM8, (35539) 1998 FJ91, and (65127) 2002 CG63.
A Potential New Satellite of (165991) 2001 YL149 Detected by Stellar Occultation
Pages 163 Bao, Victor; Gault, David
We report on observations of (165991) 2001 YL149 occulting TYC 6883-00373-1, a magnitude 10.8 star, on 2025 November 1.351 from a site in New Zealand. The minor planet was ten magnitudes fainter than the star. Bao recorded two consecutive occultations of 180 milliseconds and 40 milliseconds duration. The first drop was more than 2.6 magnitudes followed by a second one-point drop of approximately 1.8 magnitudes. A double star explanation is excluded due to the depth of both occultations. Fresnel analysis is consistent with a satellite explanation; however, the strength of a one-point observation is insufficient to claim satellite discovery. We suggest that anomalies in future rotational light curve observations might provide further evidence for the presence of a satellite.
Lightcurve Analysis for Three Near-Earth Asteroids Observed between October and December 2025
Pages 164-167 Birtwhistle, Peter
Lightcurves and amplitudes for three near-Earth asteroids observed from Great Shefford Observatory during close approaches between October and December 2025 are reported. All are small objects (~30 meters or less) with rotation periods significantly shorter than the spin barrier at ~2.2 h. One is identified as having tumbling rotation.
In This Issue
Pages 167 Warner, Brian D.
This list gives those asteroids in this issue for which physical observations (excluding astrometric only) were made. This includes lightcurves, color index, and H-G determinations, etc. In some cases, no specific results are reported due to a lack of or poor quality data. The page number is for the first page of the paper mentioning the asteroid. EP is the "go to page" value in the electronic version.
