2744 Birgitta

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2744 Birgitta
Discovery  [1]
Discovered by C.-I. Lagerkvist
Discovery site Kvistaberg Stn.
Discovery date4 September 1975
Designations
(2744) Birgitta
Named after
Anna Birgitta Angelica Lagerkvist  [1]
(discoverer's daughter)
1975 RB ·1933 QY
Mars-crosser   [1] [2] [3]
Orbital characteristics   [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 84.41 yr (30,830 d)
Aphelion 3.0670 AU
Perihelion 1.5364 AU
2.3017 AU
Eccentricity 0.3325
3.49 yr (1,275 d)
58.730°
0° 16m 55.92s / day
Inclination 6.7428°
315.55°
44.106°
Physical characteristics
Mean diameter
2.67±0.27  km [4]
3.29 km(calculated) [3]
8.97±0.08  h [5]
8.994±0.005 h [lower-alpha 1]
9.02 h [6]
0.20 (assumed) [3]
0.304±0.061 [4]
Tholen = S   [2]
SMASS = S   [2] [3]
B–V = 0.909 [2]
U–B = 0.527 [2]
14.78 [2] [3] [4]
14.84±0.12(R) [5]
15.12±0.39 [7]

    2744 Birgitta, provisional designation 1975 RB, is a stony asteroid and a Mars-crosser on an eccentric orbit from the innermost regions of the asteroid belt, approximately 3 kilometers (2 miles) in diameter. It was discovered at the Kvistaberg Station of the Uppsala Observatory in Sweden on 4 September 1975, by Swedish astronomer Claes-Ingvar Lagerkvist, who named it after his daughter, Anna Birgitta Angelica Lagerkvist. [1] The S-type asteroid has a rotation period of 9.0 hours. [3]

    Contents

    Orbit and classification

    Birgitta is a Mars-crossing asteroid, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars. There are more than 5,000 numbered Mars-crosser – or approximately 1% of the overall population of small Solar System bodies – with a perihelion between 1.3 and 1.666  AU. [8]

    Birgitta orbits the Sun at a distance of 1.5–3.1 AU once every 3 years and 6 months (1,275 days; semi-major axis of 2.3 AU). Its orbit has an eccentricity of 0.33 and an inclination of 7° with respect to the ecliptic. [2] The asteroid was first observed as 1933 QY at the Heidelberg Observatory in August 1933. The body's observation arc begins with its official discovery observation at Kvistaberg in 1975. [1]

    Physical characteristics

    Birgitta is a common, stony S-type asteroid in both the Tholen and SMASS classification. [2] [3]

    Rotation period

    In October 2010, a rotational lightcurve of Birgitta was obtained from photometric observations by American astronomer Brian Skiff. Lightcurve analysis gave a well-defined rotation period of 8.994 hours with a brightness amplitude of 0.18 magnitude ( U=3 ). [lower-alpha 1] The result supersedes a previous observation by the discoverer Claes-Ingvar Lagerkvist from the 1970s, which showed a period of 9.02 hours and an amplitude of 0.4 magnitude ( U=2 ). [6] In December 2014, astronomers at the Palomar Transient Factory in California measured as similar period of 8.97 hours with a brightness variation of 0.32 magnitude ( U=2 ). [5]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Birgitta measures 2.67 kilometers in diameter and its surface has a high albedo of 0.304, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 3.29 kilometers based on an absolute magnitude of 14.78. [3]

    Birgitta is a mid-sized Mars-crossing asteroid, smaller than 1065 Amundsenia (10 km), 1139 Atami (9 km), 1474 Beira (15 km), 1508 Kemi (17 km), 1011 Laodamia (7.5 km), 1727 Mette (9 km), 1131 Porzia (7 km), 1235 Schorria (5.5 km), 985 Rosina (8 km), 1310 Villigera (14 km) and 1468 Zomba (7 km), and significantly smaller than the largest members of this dynamical group, namely, 132 Aethra (40 km), 2204 Lyyli (25 km) and 512 Taurinensis (20 km).

    Naming

    This minor planet was named after Anna Birgitta Angelica Lagerkvist, daughter of the discoverer Claes-Ingvar Lagerkvist. [1] The official naming citation was published by the Minor Planet Center on 15 May 1984 ( M.P.C. 8800). [9]

    Notes

    1. 1 2 Skiff (2011) web: rotation period 8.994±0.005 hours with a brightness amplitude of 0.18±0.02 mag. Quality code of 3. Observations from 10 October 2010. Summary figures for (2744) Birgitta at the LCDB

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    <span class="mw-page-title-main">512 Taurinensis</span> Mars-crossing asteroid

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    641 Agnes, provisional designation 1907 ZX, is a stony Florian asteroid and slow rotator from the inner regions of the asteroid belt, approximately 9 kilometers (6 mi) in diameter.

    716 Berkeley is a background asteroid from the central regions of the asteroid belt. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 30 July 1911. The stony S-type asteroid has a rotation period of 15.6 hours and measures approximately 21 kilometers in diameter. It was named after the city of Berkeley, California, where the discoverer's colleague Armin Otto Leuschner (1868–1953) was the director of the local observatory.

    2114 Wallenquist, provisional designation 1976 HA, is a Themistian asteroid from the outer region of the asteroid belt, approximately 28 kilometers in diameter. It was discovered by Swedish astronomer Claes-Ingvar Lagerkvist at the Australian Mount Stromlo Observatory near Canberra, on 19 April 1976.

    1065 Amundsenia, provisional designation 1926 PD, is a stony asteroid and sizeable Mars-crosser on an eccentric orbit from the inner asteroid belt, approximately 10 kilometers in diameter. It was discovered on 4 August 1926, by Soviet astronomer Sergey Belyavsky at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after Norwegian polar explorer Roald Amundsen.

    1131 Porzia, provisional designation 1929 RO, is a stony asteroid and sizable Mars-crosser from the innermost regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 10 September 1929, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The asteroid was named after Porcia wife of Brutus, who assassinated Julius Caesar.

    1280 Baillauda, provisional designation 1933 QB, is a dark background asteroid from the outermost region of the asteroid belt, approximately 52 kilometers in diameter. Discovered by Eugène Delporte at Uccle Observatory in 1933, the asteroid was named after French astronomer Jules Baillaud.

    5682 Beresford, provisional designation 1990 TB is a stony asteroid and sizable Mars-crosser from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 9 October 1990, by astronomer Robert McNaught at the Siding Spring Observatory in Australia. The assumed S-type asteroid has a short rotation period of 3.8 hours. It was named after Australian amateur astronomer Anthony Beresford.

    1707 Chantal, provisional designation 1932 RL, is a stony background asteroid from the Florian region in the inner asteroid belt, approximately 7.5 kilometers in diameter. It was discovered on 8 September 1932, by astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle. The S-type asteroid has a rotation period of at least 10 hours. It was named for Chantal, the niece of Belgian astronomer Georges Roland.

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    <span class="mw-page-title-main">1207 Ostenia</span>

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    1523 Pieksämäki, provisional designation 1939 BC, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 18 January 1939, by Finnish astronomer Yrjö Väisälä at the Turku Observatory in Southwest Finland, and named for the town of Pieksämäki.

    (5836) 1993 MF is a highly eccentric, stony asteroid, classified as a near-Earth object of the Amor group of asteroids, approximately 3 kilometers in diameter. It was discovered on 22 June 1993, by American astronomers Eleanor Helin and Kenneth Lawrence at the U.S. Palomar Observatory in California.

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    References

    1. 1 2 3 4 5 6 "2744 Birgitta (1975 RB)". Minor Planet Center. Retrieved 20 March 2018.
    2. 1 2 3 4 5 6 7 8 9 "JPL Small-Body Database Browser: 2744 Birgitta (1975 RB)" (2018-01-23 last obs.). Jet Propulsion Laboratory . Retrieved 20 March 2018.
    3. 1 2 3 4 5 6 7 8 "LCDB Data for (2744) Birgitta". Asteroid Lightcurve Database (LCDB). Retrieved 20 March 2018.
    4. 1 2 3 Alí-Lagoa, V.; Delbo', M. (July 2017). "Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data". Astronomy and Astrophysics. 603: 8. arXiv: 1705.10263 . Bibcode:2017A&A...603A..55A. doi:10.1051/0004-6361/201629917. S2CID   119224590.
    5. 1 2 3 Chang, Chan-Kao; Lin, Hsing-Wen; Ip, Wing-Huen; Prince, Thomas A.; Kulkarni, Shrinivas R.; Levitan, David; et al. (December 2016). "Large Super-fast Rotator Hunting Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 227 (2): 13. arXiv: 1608.07910 . Bibcode:2016ApJS..227...20C. doi: 10.3847/0067-0049/227/2/20 .
    6. 1 2 Lagerkvist, Claes-ingvar (September 1976). "Photographic Photometry of the Asteroid 1975 RB". Icarus. 29 (1): 143–145. Bibcode:1976Icar...29..143L. doi:10.1016/0019-1035(76)90109-3.
    7. ↑ 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. S2CID   53493339.
    8. ↑ "JPL Small-Body Orbital Elements "Numbered Asteroids (50 MB)"". Jet Propulsion Laboratory . Retrieved 6 February 2018.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 March 2018.
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