7655 Adamries

7655 Adamries, provisional designation 1991 YM1, is a Nysa asteroid from the inner regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 28 December 1991, by German astronomer Freimut Börngen at Karl Schwarzschild Observatory in Tautenburg, eastern Germany.[7] It was named after mathematician Adam Ries.[2]

7655 Adamries
Discovered byF. Börngen
Discovery siteKarl Schwarzschild Obs.
Discovery date28 December 1991
MPC designation(7655) Adamries
Named after
Adam Ries
1991 YM1 · 1977 BW
main-belt · Nysa[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc39.60 yr (14,464 days)
Aphelion2.7494 AU
Perihelion2.0848 AU
2.4171 AU
3.76 yr (1,373 days)
 15m 44.28s / day
Physical characteristics
Dimensions3.60 km (calculated)[3]
4.21±0.96 km[4]
22.8758±0.1133 h[5]
0.21 (assumed)[3]
C[6] · S[3]
14.00[4] · 14.081±0.004 (R)[5] · 14.1[1] · 14.53[3] · 14.56±0.26[6]

    Classification and orbit

    Adamries is a member of the Nysa family, one of the prominent families of the inner main-belt, named after its namesake 44 Nysa. It orbits the Sun at a distance of 2.1–2.7 AU once every 3 years and 9 months (1,373 days). Its orbit has an eccentricity of 0.14 and an inclination of 4° with respect to the ecliptic.[1] Adamries was first identified as 1977 BW at CrAO/Nauchnyj in 1977, extending the asteroid's observation arc by 15 years prior to its official discovery observation.[7]

    Physical characteristics

    Adamries has been characterized as a carbonaceous C-type asteroid by Pan-STARRS' photometric survey.[6] It is also an assumed stony S-type asteroid.[3]


    In September 2013, rotational lightcurve of Adamries was obtained from photometric observation by astronomers at the Palomar Transient Factory in California. It showed a longer-than-average rotation period of 22.8758 hours with a brightness variation of 0.33 magnitude (U=2).[5]

    Diameter and albedo

    According to the survey carried out by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Adamries measures 4.2 kilometers in diameter and its surface has an albedo of 0.25, which is typical for stony asteroids.[4] CALL assumes a standard albedo for stony asteroids of 0.21 and calculates a diameter of 3.6 kilometers with an absolute magnitude of 14.53.[3]


    This minor planet was named in honor of famous German mathematician Adam Ries (1492–1559), who wrote the first German arithmetic book in the 16th century, explaining in simple terms to the common people how to do arithmetic.[2]

    At the time, this was considered to be difficult. This minor planet was the 100th numbered discovery of astronomer Freimut Börngen.[2] The approved naming citation was published by the Minor Planet Center on 18 August 1997 (M.P.C. 30478).[8] This minor planet should not be confused with 236305 Adamriess, named after American astronomer and 2011 Nobel Prize winner Adam Riess.


    1. "JPL Small-Body Database Browser: 7655 Adamries (1991 YM1)" (2016-08-27 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2017.
    2. Schmadel, Lutz D. (2007). "(7655) Adamries". Dictionary of Minor Planet Names – (7655) Adamries. Springer Berlin Heidelberg. p. 608. doi:10.1007/978-3-540-29925-7_6601. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (7655) Adamries". Asteroid Lightcurve Database (LCDB). Retrieved 29 April 2016.
    4. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 29 April 2016.
    5. Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 29 April 2016.
    6. Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 29 April 2016.
    7. "7655 Adamries (1991 YM1)". Minor Planet Center. Retrieved 29 April 2016.
    8. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 29 April 2016.

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