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Call for Observations

Neglected Asteroids

Astronomical Observatory Institute of Poznan, Poland is coordinating a world-wide observing campaign of somewhat neglected asteroids. These are small bodies of the main belt with slow rotation and small lightcurve amplitudes, avoided by most of previous studies [1]. The aim is to improve biased statistics of spin and shape modelled asteroids. Recent results from TESS spacecraft have shown that slow rotators are actually dominating in the population of main belt asteroids [4], while asteroids with available spin and shape model have predominantly short rotation periods.

We focus on multi-apparition photometric observations, lightcurve inversion modelling, and scaling those models with thermal infrared data [2, 3]. However, many of these asteroids have poor or problematic thermal datasets, and cannot be precisely scaled this way. This is where good, multi-chord occultation can greatly help. Occultations can also pinpoint the correct spin and shape solution from two mirror ones produced by lightcurve inversion (see e.g. Svea model fitting in paper [2]). For some of our targets, marked in bold in the list, Gaia mission will provide mass, so precise density could be derived for studies on internal composition.

Please join the project and observe stellar occultations by the these asteroids, whenever possible.

List of proposed asteroids

    70  Panopaea             581  Tauntonia 
   101  Helena               657  Gunlod 
   215  Oenone               666  Desdemona 
   223  Rosa                 668  Dora 
   269  Justitia             672  Astarte 
   279  Thule                688  Melanie 
   286  Iclea                738  Alagasta 
   305  Gordonia             777  Gutemberga 
   309  Fraternitas          806  Gyldenia 
   326  Tamara               814  Tauris 
   366  Vincentina           838  Seraphina 
   373  Melusina             845  Naema 
   395  Delia                859  Bouzareah 
   397  Vienna               880  Herba
   412  Elisabetha           903  Nealley 
   429  Lotis                907  Rhoda
   439  Ohio                 921  Jovita 
   464  Megaira              931  Whittemora 
   524  Fidelio              938  Chlosinde 
   527  Euryanthe            992  Swasey 
   541  Deborah              999  Zachia 
   551  Ortrud              1062  Ljuba 
   566  Stereoskopia

In case of any questions, please contact Dr. Anna Marciniak at:


[1] Marciniak et al. 2015, "Against the bias in spins and shapes of asteroids", Planet Space Sci. 118, 256; arXiv:1711.02429
[2] Marciniak et al. 2018, ''Photometric survey, modelling, and scaling of long-period and low-amplitude asteroids'', Astronomy Astrophys., 610, A7; arXiv:1711.01893
[3] Marciniak et al. 2019, ''Thermal properties of slowly rotating asteroids. Results from targeted survey'' Astronomy Astrophys., 625, A139, arXiv:1905.06056
[4] Pál et al. 2020 ''Solar System objects observed with TESS -- First data release: bright main-belt and Trojan asteroids from the Southern Survey'' ApJS 247, 26; arXiv:2001.05922