The Minor Planet Bulletin

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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. It is considered to be a refereed journal by the SAO/NASA ADS. All MPB papers are indexed in the ADS.

Print subscriptions are no longer available to individuals. Institutions (e.g., college libraries) can still obtain print copies via a special subscription. See details in MPB 37-4 or contact the editor, Richard Binzel.

Annual voluntary contributions of $5.00 or more in support of the publication are welcome.
Please send a check, drawn on a U.S. bank and payable in U.S. funds, to "Minor Planet Bulletin" and send it to:

Minor Planet Bulletin
c/o Melissa Hayes-Gehrke
UMD Astronomy Department
1113 PSC Bldg 415
College Park, MD 20742

Authors Guide and Word Templates   (v.3.0: updated 2024 February 2)
The ZIP file contains the Authors Guide PDF as well as a "starter" paper in Word 2007+ (DOTX).
Those using Word 97 (DOC/DOT) are encouraged to download OpenOffice and convert their files to the most recent Word format (DOCX).
Please read this updated guide since there are a number of changes from previous guides.
  • A new, optional, table is available for those wanting to include physical and discovery information
    in a more accessible way.
    See the announcement in Minor Planet Bulletin 51-2.
  • The Pts column is no longer required and has been removed from the template for the standard table
    to allow more room for the other columns.
  • The phase column should have only two values: for the first and last date in the range.
    If the phase reaches an extrema between those dates, put an asterisk before the first value. For example,
  • Use semicolons to separate names in the references section. For example:
       Smith, J.J.; Jones, A.A. (2019).
    This also applies if using several references to the same author in the text. For example:
    "This asteroid was observed at three previous apparitions (Jones, 2015; 2017; 2018)..."

Cumulative Index to Volumes 1-45
Cumulative Asteroid Lightcurve Index (Volumes 1 through 51-2)

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Published between    

Issues for the upcoming quarter-year are released on about the 21st of March, June, September, and December. Full issues and individual papers from vol 1 (1973) to present are available via links on this page.

Important: If the ADS bibcode and "Download PDF" links are missing for the latest issue, it is because the ADS has not processed the files. The links will be made available after the ADS processes the files.
If the "Download PDF" link is visible and there is no PDF available, clicking the link will download an arbitrary page. We are working with ADS to make sure all papers are available and, if not, being able to diasable the link. The "Download Full Issue" link does retrieve the correct file.

Vol 1-7 run Jul-Jun. Vol 8-present run Jan-Dec. Only papers indexed in the ADS are included. Earlier volumes often contain more papers than listed here. It's recommended to download the full issue in vol 1-9.

Volume 51 (2024)

Volume 50 (2023)

Volume 49 (2022)

Volume 48 (2021)

Volume 47 (2020)

Volume 46 (2019)

Volume 45 (2018)

Volume 44 (2017)

Volume 43 (2016)

Volume 42 (2015)

Volume 41 (2014)

Volume 40 (2013)

Volume 39 (2012)

Volume 38 (2011)

Volume 37 (2010)

Volume 36 (2009)

Volume 35 (2008)

Volume 34 (2007)

Volume 33 (2006)

Volume 32 (2005)

Volume 31 (2004)

Volume 30 (2003)

Volume 29 (2002)

Volume 28 (2001)

Volume 27 (2000)

Volume 26 (1999)

Volume 25 (1998)

Volume 24 (1997)

Volume 23 (1996)

Volume 22 (1995)

Volume 21 (1994)

Volume 20 (1993)

Volume 19 (1992)

Volume 18 (1991)

Volume 17 (1990)

Volume 16 (1989)

Volume 15 (1988)

Volume 14 (1987)

Volume 13 (1986)

Volume 12 (1985)

Volume 11 (1984)

Volume 10 (1983)

Volume 9 (1982)

Volume 8 (1981)

Volume 7 (1980)

Volumes 6-7 (1979)

Volumes 5-6 (1978)

Volumes 4-5 (1977)

Volumes 3-4 (1976)

Volumes 2-3 (1975)

Volumes 1-2 (1974)

Volume 1 (1973)

Issue 48-2 (2021 Apr-Jun)
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Rotation Period Determination for Asteroid 665 Sabine
Pages 99
Sioulas, Nick
2021MPBu...48...99S    Download PDF

Photometric observations of the main-belt asteroid 665 Sabine were conducted from the NOAK Observatory, in Greece in order to determine its synodic rotation period. The results are: P = 4.299 ± 0.004 h, A = 0.33 mag.

Fast Rotator Minor Planet 2020 UA From Cluj and Berthelot Observatory
Pages 100-101
Sonka, Adrian Bruno; Turcu, Vlad; Nedelcu, Alin; Birlan, Mirel; Moldovan, Dan
2021MPBu...48..100S    Download PDF

We have observed minor planet 2020 UA during an exceptional close approach and determined that it is a fast rotator. For two data sets, taken 2 hours apart, our measurements suggest two different rotational periods: 0.0440 ± 0.0006 h and 0.0293 ± 0.0002 h.

The Elusive Period of the Hilda 1269 Rollandia
Pages 102-103
Romanishin, W.
2021MPBu...48..102R    Download PDF

I present high quality lightcurve data on the large Hilda 1269 Rollandia. The data were obtained using a 0.9m telescope at Cerro Tololo Interamerican Observatory in Chile in May 2013 and cover over 17 hours split over two consecutive nights. This data is not sufficient to find a reliable rotation period for Rollandia. However, the data it is sufficient to rule out most of the published periods for this object.

Photometric Analysis and Rotation Period Determination of the Potentially Hazardous Asteroid 2020 WU5
Pages 104-105
Marchini, Alessandro; Papini, Riccardo; Baj, Giorgio; Galli, Gianni; Bacci, Paolo; Franco, Lorenzo
2021MPBu...48..104M    Download PDF

Photometric observations of 2020 WU5 were conducted in 2021 January in order to determine its synodic rotation period and revealed a bimodal solution with P = 5.574 ± 0.002 h and an amplitude A = 0.84 ± 0.08 mag.

Rotational Period and Lightcurve Determination of 2020 UQ6: A Super Fast Rotator
Pages 105-106
Guido, Ernesto; Catapano, Antonio; Noschese, Alfonso; Vecchione, Antonio
2021MPBu...48..105G    Download PDF

The lightcurve and rotation period determination for 2020 UQ6 are reported based on observations made in late October 2020. 2020 UQ6 is a super-fast rotator with a period of 0.04521 +/- 0.000001 h.

Lightcurve Analysis for Two Main-belt Asteroids
Pages 107
Casalnuovo, Giovanni Battista
2021MPBu...48..107C    Download PDF

Photometric observations of two main-belt asteroids, (11894) 1991 GW, 19120 Doronina (1983 PM1), were made at the Filzi School Observatory (School in country Laives - Italy) MPC code D12.

Lightcurve Analysis for Three Main-belt Asteroids
Pages 108-109
Casalnuovo, Giovanni Battista
2021MPBu...48..108C    Download PDF

Photometric observations of three main-belt asteroids, (18640) 1998 EF9, (41331) 1999 XB232, (50713) 2000 EZ135, were made at the Filzi School Observatory (School in country Laives - Italy) MPC code D12.

Rotational Period Determination of 1526 Mikkeli
Pages 109
Scardella, Maurizio; Badoni, Federico; Tomassini, Angelo; Pierri, Fernando
2021MPBu...48..109S    Download PDF

The main-belt asteroid 1526 Mikkeli was observed over seven nights throughout 2020 October-November in order to determine its synodic rotational period. Lightcurve analysis was done using differential photometry technique using MPO Canopus (Warner, 2012). The observations were carried out from “F. Fuligni” Observatory using a 0.35-m f/10 ACF telescope and SBIG ST8-XE CCD camera unfiltered. All images were dark and flat-field calibrated with Maxim DL.

Photometric Analysis and Rotation Period Determination for Asteroids 5445 Williwaw, (8823) 1987 WS3 and (26568) 2000 ET49
Pages 110-112
Marchini, Alessandro; Papini, Riccardo; Scarfi, Giulio
2021MPBu...48..110M    Download PDF

Photometric observations of three main-belt asteroids were conducted in order to determine their synodic rotation periods. For 5445 Williwaw we found P = 10.65 ± 0.02 h, A = 0.29 ± 0.05 mag; for (8823) 1987 WS3, a slow rotator, we found a rough period of P = 86.0 ± 1.0 h, A = 0.24 ± 0.02 mag; for (26568) 2000 ET49 we found P = 7.171 ± 0.003 h, A = 0.71 ± 0.04 mag

Rotation Period of Koronis Family Member 1840 Hus
Pages 112-113
Slivan, Stephen M.; McLellan-Cassivi, Claire; Shishido, Rila; Wang, Nieky
2021MPBu...48..112S    Download PDF

We report rotation lightcurves of 1840 Hus observed during its apparition in 2020. The constraints from our data, combined with a reanalysis of published lightcurves recorded in 2009, yield a secure rotation period of 4.7483 ± 0.0008 h.

Visual Observation of 3000+ Minor Planets
Pages 113-114
Salthouse, Andrew
2021MPBu...48..113S    Download PDF

The author describes the results of visually observing 3,028 distinct minor planets over a 54-year period.

Lightcurves of Six Asteroids
Pages 115-116
Ferrero, Andrea
2021MPBu...48..115F    Download PDF

In the following paper we present the result of a photometric survey on six asteroids: 2262 Mitidika, P = 28.257 ± 0.004 h, A = 0.26 mag; 3955 Bruckner, P = 7.549 ± 0.002 h, A = 0.25 mag; (16559) 1991 VA3, P = 473.34 ± 0.27 h, A = 1.17 mag; (21182) 1994 EC2, P = 12.981 ± 0.002 h, A = 0.10 mag; (22393) 1994 QV, P = 3.419 ± 0.001 h, A = 0.23 mag; (43028) 1999 VE23, P = 3.940 ± 0.002 h, A = 0.36 mag.

Photometry of 12 Asteroids from Sopot Astronomical Observatory: 2020 October- December
Pages 117-119
Benishek, Vladimir
2021MPBu...48..117B    Download PDF

A brief overview of the lightcurve and synodic rotation period determination for 12 asteroids from CCD photometric observations conducted at Sopot Astronomical Observatory (SAO) in the time span 2020 October - December is presented in this paper.

Collaborative Asteroid Photometry from UAI: 2020 October-December
Pages 120-122
Franco, Lorenzo; De Pieri, Antonio; Brosio, Antonino; Papini, Riccardo; Salvaggio, Fabio; Scarfi, Giulio; Marchini, Alessandro; Ruocco, Nello; Galli, Gianni; Mannucci, Massimiliano; Montigiani, Nico; Tinelli, Luciano; Aceti, Pietro, Banfi, Massimo; Baj, Giorgio; Casalnuovo, Giovanni Battista; Chinaglia, Benedetto; Bacci, Paolo; Maestripieri, Martina; Coffano, Alessandro; Marinello, Wladimiro; Betti, Liviano; Mortari, Fabio
2021MPBu...48..120F    Download PDF

Photometric observations of five asteroids were made in order to acquire lightcurves for shape/spin axis modeling. The synodic period and lightcurve amplitude were found for 102 Miriam: 23.63 ± 0.01 h, 0.14 mag; 635 Vundtia: 11.784 ± 0.004 h, 0.20 mag; 1342 Brabantia: 4.175 ± 0.001 h, 0.13 mag; 2346 Lilio: 3.0290 ± 0.0005 h, 0.18 mag; (153201) 2000 WO107: 5.026 ± 0.001 h, 1.14 mag.

CCD Photometric Observations of Asteroids 4493 Naitomitsu, (21242) 1995 WZ41, (68130) 2001 AO17, And (183230) 2002 TC58
Pages 123-124
Zeigler, Kenneth
2021MPBu...48..123Z    Download PDF

CCD Photometric observations of asteroids 4493 Naitomitsu, (21242) 1995 WZ41, (68130) 2001 AO17, and (183230) 2002 TC58 were conducted from the Star Z Research Ranch in South Texas. The results found are 4493 Naitomitsu 7.423 ± 0.01 hr, amplitude 0.22 mag.; 1995 WZ41 5.456 ± 0.01 hr, amplitude 0.47 mag.; 2001 AO17 10.515 ± 0.01 hr, amplitude 0.34 mag.; 2002 TC58 3.616 ± 0.01 hr, amplitude 0.14 mag.

Lightcurves of Eighteen Asteroids
Pages 125-132
Dose, Eric V.
2021MPBu...48..125D    Download PDF

Using a previously described workflow built on applying to each image dozens of comparison stars from the ATLAS refcat2 catalog, we have obtained and present here lightcurves and synodic rotation periods for eighteen asteroids.125-132

Lightcurves and Rotation Periods of 67 Asia, 74 Galatea, 356 Liguria, 570 Kythera, 581 Tauntonia, 589 Croatia, and 605 Juvisia
Pages 132-135
Pilcher, Frederick
2021MPBu...48..132P    Download PDF

Synodic rotation periods and amplitudes are found for 67 Asia: 15.855 ± 0.002 h, 0.32 ± 0.02 mag; 74 Galatea: 17.266 ± 0.001 h, 0.06 ± 0.01 mag; 356 Liguria: 31.690 ± 0.002 h, 0.14 ± 0.01 mag; 570 Kythera: 8.117 ± 0.001 h, 0.09 ± 0.01 mag; 581 Tauntonia: 24.994 ± 0.002 h, 0.10 ± 0.01 mag; 589 Croatia: 24.932 ± 0.001 h, 0.25 ± 0.01 mag; 605 Juvisia: 15.844 ± 0.001 h, 0.18 ± 0.01 mag.

Asteroids 4092 Tyr (Follow Up, Analysis, Preliminary Results) and 699 Hela (Spin-Shape Model)
Pages 136-139
Alonso, E. Díez; García, F.; Farfán, R.G.; Pravec, P.; Gutiérrez, P.J.; Ruíz, J.; Limón, F.; Delgado, J.; Naves, R.; Bosch, J.M.; Reina, E.; Temprano, J.; Gómez, Sergio Luis Suárez; Gutiérrez, C. González; García, F. Riesgo; Fernández, S.; de Cos Juez, J.
2021MPBu...48..136A    Download PDF

In this work we present the results of the photometric follow up of the asteroid 4092 Tyr carried out by the Grupo de Observadores de Asteroides throughout the months of 2020 August and September. The rotation period derived from the observations is P = 16.091 ± 0.003 h. Furthermore, 4092 Tyr has been revealed to be a synchronous binary asteroid with two main bodies of similar size. We also present a confirmation of the rotation period of the asteroid 699 Hela (0.1415100 ± 0.0000024 d), and a study of its shape and spin. We analyze dense lightcurves acquired in 2020 by the Grupo de Observadores de Asteroides, as well as those available in public databases. We have also used sparse lightcurves from USNO (Flagstaff) and the TESS mission. We find two possible solutions for the spin axis (λ1, ß1) = (37°, +51°), (λ2, ß2) = (189°, +14°), in agreement with previously published models.

Asteroid Photometry and Lightcurve Analysis at Gora’S Observatories, Part IV.
Pages 140-143
Colazo, Milagros; Stechina, Ariel; Fornari, César; Suárez, Néstor; Melia, Raúl; Morales, Mario; Bellocchio, Ezequiel; Pulver, Eduardo; Speranza, Tiago; Scotta, Damián; Wilberger, Aldo; Mottino, Aldo; Meza, Erick; Romero, Fabricio, Passarino, Patricio Tourne; Suligoy, Matías; Llanos, Ricardo; Chapman, Andrés; Martini, Matías; Colazo, Carlos
2021MPBu...48..140C    Download PDF

Synodic rotation periods and amplitudes are reported for: 424 Gratia, 579 Sidonia, 589 Croatia, 693 Zerbinetta, 791 Ani, 824 Anastasia, 858 El Djezair, 1024 Hale, 1271 Isergina, 1663 van den Bos.

Photometric Observations of Eight Minor Planets for Shape Modeling
Pages 144-147
Polakis, Tom
2021MPBu...48..144P    Download PDF

Phased lightcurves and synodic rotation periods for eight main-belt asteroids are presented, based on CCD observations made in 2020 October. The purpose of obtaining these particular lightcurves is to augment shape modeling efforts. All the data have been submitted to the ALCDEF database.

Rotational Period and Lightcurve Determination of 4625 Shchedrin, (8823) 1987 WS3, (15010) 1998 QL92, (19755) 2000 EH34, and 21082 Araimasaru
Pages 147-149
Noschese, Alfonso; Ruocco, Nello; Catapano, Antonio; Mollica, Maurizio; Vecchione, Antonio
2021MPBu...48..147N    Download PDF

Photometric observations of five asteroids were performed in order to acquire lightcurves and to determine the rotational periods. The synodic period and lightcurve amplitude were found for 4625 Shchedrin, (8823) 1987 WS3, (15010) 1998 QL92, (19755) 2000 EH34, and 21082 Araimasaru.

Main-belt Asteroids Observed from CS3: 2020 October to December
Pages 150-158
Stephens, Robert D.; Warner, Brian D.
2021MPBu...48..150S    Download PDF

CCD photometric observations of 12 main-belt asteroids were obtained at the Center for Solar System Studies (CS3) from 2020 October to December.

Period Determinations for Seventeen Minor Planets
Pages 158-163
Polakis, Tom
2021MPBu...48..158P    Download PDF

Phased lightcurves and synodic rotation periods for 17 main-belt asteroids are presented, based on CCD observations made from 2020 October through 2020 December. All the data have been submitted to the ALCDEF database.

Lightcurve Analysis of Hilda Asteroids at the Center for Solar System Studies: 2020 October-December
Pages 164-195
Warner, Brian D.; Stephens, Robert D.
2021MPBu...48..164W    Download PDF

New CCD photometric observations of two Hilda asteroid members were made from 2020 October through December: 748 Simeisa and 1754 Cunningham. The latest data for Simeisa conclusively reject earlier reports of a period near 11.9 h.

Lightcurve Based Determination of 10 Hygiea’S Rotational Period With Trappist-North and -South
Pages 166-167
Ferrais, Marin; Jehin, Emmanuël; Vernazza, Pierre; Jorda, Laurent; Moulane, Youssef; Pozuelos, Francisco J.; Manfroid, Jean; Barkaoui, Khalid; Benkhaldoun, Zouhair
2021MPBu...48..166F    Download PDF

A densely-sampled lightcurve of the large main-belt asteroid 10 Hygiea was obtained with the TRAPPISTSouth (TS) and TRAPPIST-North (TN) telescopes in 2018 September and October. We found its synodic rotation period and amplitude to be 13.8224 ± 0.0005 h and 0.27 mag. The data have been submitted to the ALCDEF database.

Lightcurve Analysis of L4 Trojan Asteroids at the Center for Solar System Studies: 2020 October to December
Pages 167-170
Stephens, Robert D.; Warner, Brian D.
2021MPBu...48..167S    Download PDF

Lightcurves for six L4 Jovian Trojan asteroids were obtained at the Center for Solar System Studies (CS3) from 2020 October to December.

Call for Observations
Pages 170
Pilcher, F.
2021MPBu...48..170P    Download PDF

Observers who have made visual, photographic, or CCD measurements of positions of minor planets in calendar year 2020 are encouraged to report them to this author on or before 2021 April 1. This will be the deadline for receipt of reports, for which results can be included in the “General Report of Position Observations for 2020,” to be published in MPB Vol. 48, No. 3.

Near-Earth Asteroid Lightcurve Analysis at the Center for Solar System Studies: 2020 September to 2021 January
Pages 170-179
Warner, Brian D.; Stephens, Robert D.
2021MPBu...48..170W    Download PDF

Lightcurves of 22 Near-Earth asteroids (NEAs) obtained at the Center for Solar System Studies (CS3) from 2020 October to early 2021 January were analyzed for rotation period, peak-to-peak amplitude, and signs of satellites or tumbling.

Lightcurve Analysis for Ten Near-Earth Asteroids
Pages 180-186
Birtwhistle, Peter
2021MPBu...48..180B    Download PDF

Lightcurves and amplitudes for ten near-Earth asteroids observed from Great Shefford Observatory during close approaches in 2018 and 2020 are reported: 2018 KF1, 2020 GF2, 2020 OH3, 2020 RA6, 2020 RZ6, 2020 TP1, 2020 TD8, 2020 UQ6, 2020 VZ6 and 2020 XX3. 2020 UQ6 is the largest, with H = 22.6, all others are small objects, H > 24.5. Seven have superfast rotation periods, P < 10 min, including 2020 RZ6 and 2020 TD8 with P < 1 min.

On Confirmed and Suspected Binary Asteroids Observed at the Center for Solar System Studies
Pages 187-193
Warner, Brian D.; Stephens, Robert D.
2021MPBu...48..187W    Download PDF

The analysis of observations made at the Center for Solar System Studies from 2020 September to 2021 January led to the discovery that the Vestoid asteroid 3865 Lindbloom is a fully synchronous binary. The orbital period is 26.016 h and the ratio of the effective diameters is 0.65 < Ds/Dp < 1.0. Assuming a bulk density of 2 g/cm, Dp <= 7.2 km, Ds >= 4.6 km, and the center-to-center separation is 20 km. Other objects presented here were found to have secondary periods: 4503 Cleobulus, (22056) 2000 AU31, 25465 Rajagopalan, (46818) 1998 MZ24, (48205) 2012 TQ78, 2013 PY6, and 2020 PD1. Of those, only 1998 MZ24 and 2013 PY6 might be said to show mutual events due to a satellite.

Lightcurve Photometry Opportunities: 2021 April-June
Pages 194-198
Warner, Brian D.; Harris, Alan W.; Durech, Josef; Benner, Lance A.M.
2021MPBu...48..194W    Download PDF

We present lists of asteroid photometry opportunities for objects reaching a favorable apparition and having either none or poorly-defined lightcurve parameters. Additional data on these objects will help with shape and spin axis modeling via lightcurve inversion. We also include lists of objects that will be the target of radar observations. Lightcurves for these objects can help constrain pole solutions and/or remove rotation period ambiguities that might not come from using radar data alone.

In This Issue
Pages 199
Warner, Brian D.
2021MPBu...48..199W    Download PDF

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.

copyright©2017-2022 Brian D. Warner. Funding to support this web site was provided by NASA grant NSSC 80NSSC18K0851 prior to 2021 April.