1075 Helina

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1075 Helina
001075-asteroid shape model (1075) Helina.png
Modelled shape of Helina from its lightcurve
Discovery [1]
Discovered by G. Neujmin
Discovery site Simeiz Obs.
Discovery date29 September 1926
Designations
(1075) Helina
Named after
Helij Neujmin [2]
(discoverer's son)
1926 SC ·1930 KV
1965 CB ·A906 YG
A916 WH
main-belt  ·(outer)
Eos [3] [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 110.85 yr (40,489 days)
Aphelion 3.3528 AU
Perihelion 2.6705 AU
3.0116 AU
Eccentricity 0.1133
5.23 yr (1,909 days)
156.59°
0° 11m 18.96s / day
Inclination 11.523°
100.81°
250.61°
Physical characteristics
Mean diameter
26.198±0.414 km [5]
30.39±7.76 km [6]
34.48±0.58 km [5]
35.52 km [3] [7]
37.93±0.85 km [8]
44.554±0.1526 h [9]
44.6768±0.0001 h [10]
44.6770±0.0002 h [lower-alpha 1]
44.677±0.001 h [11]
44.9±0.1 h [12]
  • (127.0°, −43.0.0°) (λ1/β1) [4]
  • (280.0°, −44.0°) (λ2/β2) [4]
0.11±0.07 [6]
0.111±0.005 [8]
0.1220 [3] [7]
0.129±0.009 [5]
Tholen = SU [1] [3]
B–V = 0.765 [1]
U–B = 0.370 [1]
10.10±0.43 [13]  ·10.15 [1] [3] [5] [7] [8]  ·10.31 [6]  ·10.371±0.003(R) [9]

    1075 Helina, provisional designation 1926 SC, is a stony Eos asteroid from the outer regions of the asteroid belt, approximately 34 kilometers (21 miles) in diameter. It was discovered on 29 September 1926, by astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. [14] The asteroid was named after the discoverer's son, Helij Neujmin. [2]

    Contents

    Orbit and classification

    Helina is a member the Eos family ( 606 ), [3] [4] the largest asteroid family of the outer main belt consisting of nearly 10,000 asteroids. [15] : 23  It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.4  AU once every 5 years and 3 months (1,909 days; semi-major axis of 3.01 AU). Its orbit has an eccentricity of 0.11 and an inclination of 12° with respect to the ecliptic. [1]

    The asteroid was first identified as A906 YG at Heidelberg Observatory in December 1906. The body's observation arc begins at Simeiz Observatory in October 1926, nine days after its official discovery observation. [14]

    Naming

    This minor planet was named after Helij Grigorevich Neujmin (1910–1982), a son of discoverer Grigory Neujmin. The author of the Dictionary of Minor Planet Names, Lutz Schmadel learned about the naming circumstances from Crimean astronomers I. I. Neyachenko and N. S. Chernykh (see 2325 Chernykh). [2]

    Physical characteristics

    In the Tholen classification, Helina is a stony S-type asteroid with an unusual spectra (SU). [1] [3]

    Rotation period

    In March 2013, a rotational lightcurve of Helina was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 44.554 hours with a brightness variation of 0.91 magnitude ( U=2 ). [9] In April 2013, European amateur astronomers Matthieu Bachschmidt, Paul Krafft, Olivier Gerteis, Hubert Gully and Luc Arnold measured a period of 44.9 hours with an amplitude of 0.64 magnitude ( U=3- ). [12]

    While not being a slow rotator, Helina has a longer-than average period. Its high brightness amplitude is also indicative for an elongated or irregular shape, rather than a spherical one.

    Poles

    The asteroid's lightcurve has also been modeled several times. It gave a concurring period of 44.6768 and 44.677 hours, respectively. [10] [11] [lower-alpha 1] Modelling in the 2018-study also gave two spin axis of (127.0°, −43.0.0°) and (280.0°, −44.0°) in ecliptic coordinates (λ, β). [11]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Helina measures between 26.198 and 37.93 kilometers in diameter and its surface has an albedo between 0.11 and 0.129. [5] [6] [7] [8] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is an albedo of 0.1220 and a diameter of 35.52 kilometers based on an absolute magnitude of 10.15. [3] [7]

    Notes

    1. 1 2 Hanus (2016d) publication not indexed in ADS. Summary figures for (1075) Helina at LCDB

    Related Research Articles

    1099 Figneria, provisional designation 1928 RQ, is an asteroid from the background population of the outer regions of the asteroid belt, approximately 26 kilometers in diameter. Discovered by Grigory Neujmin at Simeiz Observatory in 1928, the asteroid was later named after Russian revolutionary activist Vera Figner.

    <span class="mw-page-title-main">1110 Jaroslawa</span>

    1110 Jaroslawa is a bright background asteroid and rather slow rotator from the inner regions of the asteroid belt. The stony S-type asteroid has a rotation period of 97.4 hours and measures approximately 13 kilometers in diameter. It was discovered at the Simeiz Observatory on the Crimean peninsula on 10 August 1928, by astronomer Soviet Grigory Neujmin, who named it after his son, Jaroslav Grigorevich Neujmin.

    <span class="mw-page-title-main">1129 Neujmina</span>

    1129 Neujmina is an Eos asteroid from the outer regions of the asteroid belt. It was discovered on 8 August 1929, by astronomer Praskoviya Parchomenko at the Simeiz Observatory on the Crimean peninsula. The stony S-type asteroid has a rotation period of 5.1 hours and measures approximately 34 kilometers in diameter. It was named after Soviet astronomer Grigory Neujmin.

    <span class="mw-page-title-main">1137 Raïssa</span>

    1137 Raïssa is a stony background asteroid and slow rotator, approximately 22 kilometers in diameter, located in the inner regions of the asteroid belt. It was discovered by Grigory Neujmin at Simeiz Observatory in 1929, and named in memory of Raïssa Maseeva, who worked at the Pulkovo Observatory.

    <span class="mw-page-title-main">1140 Crimea</span>

    1140 Crimea, provisional designation 1929 YC, is a stony asteroid from the middle region of the asteroid belt, approximately 28 kilometers in diameter. It was discovered on 30 December 1929, by Soviet astronomer Grigory Neujmin at Simeiz Observatory on the Crimean peninsula, after which it was named.

    1146 Biarmia, provisional designation 1929 JF, is a metallic background asteroid from the outer regions of the asteroid belt, approximately 32 kilometers in diameter. It was discovered on 7 May 1929, by Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named for the Bjarmaland mentioned in Norse sagas.

    1158 Luda, provisional designation 1929 QF, is a stony asteroid from the middle regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 31 August 1929, by Soviet astronomer Grigory Neujmin at Simeiz Observatory on the Crimean peninsula. It was named after Ludmilla Neujmin, the sister of the discoverer.

    <span class="mw-page-title-main">1277 Dolores</span>

    1277 Dolores is a carbonaceous background asteroid from the central regions of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 18 April 1933, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after Spanish communist Dolores Ibárruri.

    <span class="mw-page-title-main">1188 Gothlandia</span>

    1188 Gothlandia, provisional designation 1930 SB, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. Discovered by astronomer Josep Comas i Solà at the Fabra Observatory in 1930, the asteroid was later named after the ancient name of the Spanish autonomous community of Catalonia.

    <span class="mw-page-title-main">1281 Jeanne</span>

    1281 Jeanne is a dark asteroid from the background population of the intermediate asteroid belt. It was discovered on 25 August 1933, by astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle, who named it after his daughter, Jeanne. The likely P-type asteroid has a rotation period of 15.2 hours and measures approximately 22 kilometers in diameter.

    <span class="mw-page-title-main">1379 Lomonosowa</span>

    1379 Lomonosowa is a stony background asteroid from the central regions of the asteroid belt, approximately 19 kilometers in diameter. Discovered by Grigory Neujmin at the Simeiz Observatory in 1936, the asteroid was later named after Russian physicist and astronomer Mikhail Lomonosov.

    1176 Lucidor, provisional designation 1930 VE, is a carbonaceous background asteroid from the central region of the asteroid belt, approximately 30 kilometers in diameter. It was discovered by Eugène Delporte in 1930, who named it after a friend.

    <span class="mw-page-title-main">1353 Maartje</span>

    1353 Maartje, provisional designation 1935 CU, is an Eoan asteroid from the outer regions of the asteroid belt, approximately 37 kilometers in diameter. It was discovered on 13 February 1935, by Dutch astronomer Hendrik van Gent at the Union Observatory in Johannesburg, South Africa. The asteroid was named after Maartje Mekking, daughter of a staff member at the Dutch Leiden Observatory.

    1347 Patria, provisional designation 1931 VW, is a carbonaceous asteroid from the background population of the central asteroid belt, approximately 32 kilometers in diameter. It was discovered on 6 November 1931, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named for the Latin word of fatherland.

    <span class="mw-page-title-main">1291 Phryne</span>

    1291 Phryne, provisional designation 1933 RA, is an Eoan asteroid from the outer regions of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 15 September 1933, by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle. The asteroid was named after the ancient Greek courtesan Phryne.

    1306 Scythia, provisional designation 1930 OB, is a dark Ursula asteroid from the outer regions of the asteroid belt, approximately 72 kilometers in diameter. It was discovered on 22 July 1930, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named for the historic region of Scythia.

    <span class="mw-page-title-main">1339 Désagneauxa</span>

    1339 Désagneauxa, provisional designation 1934 XB, is a stony Eoan asteroid from the outer region of the asteroid belt, approximately 24 kilometers in diameter. It was discovered on 4 December 1934, by French astronomer Louis Boyer at the North African Algiers Observatory in Algeria. A few nights later, the asteroid was independently discovered by astronomers Grigory Neujmin and Eugène Delporte, at the Crimean Simeiz and Belgian Uccle Observatory, respectively. It was later named after discoverer's brother-in-law.

    <span class="mw-page-title-main">1289 Kutaïssi</span>

    1289 Kutaïssi is a stony Koronian asteroid from the outer region of the asteroid belt. Discovered by Grigory Neujmin at Simeiz Observatory in 1933, it was later named after the Georgian city of Kutaisi. The S-type asteroid has a rotation period of 3.6 hours and measures approximately 22 kilometers in diameter.

    <span class="mw-page-title-main">1407 Lindelöf</span>

    1407 Lindelöf, provisional designation 1936 WC, is an asteroid from the central region of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 21 November 1936, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. The asteroid was named after Finnish topologist Ernst Lindelöf.

    <span class="mw-page-title-main">1545 Thernöe</span>

    1545 Thernöe is an elongated background asteroid from the central region of the asteroid belt. It was discovered on 15 October 1941, by Finnish astronomer Liisi Oterma at Turku Observatory in Southwest Finland. The uncommon K-type asteroid has a rotation period of 16.1 hours and measures approximately 18 kilometers in diameter. It was later named after Danish astronomer Karl August Thernöe.

    References

    1. 1 2 3 4 5 6 7 8 "JPL Small-Body Database Browser: 1075 Helina (1926 SC)" (2017-10-30 last obs.). Jet Propulsion Laboratory . Retrieved 6 December 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(1075) Helina". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 92. doi:10.1007/978-3-540-29925-7_1076. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 7 8 "LCDB Data for (1075) Helina". Asteroid Lightcurve Database (LCDB). Retrieved 6 December 2017.
    4. 1 2 3 4 "Asteroid 1075 Helina – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. 1 2 3 4 5 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 6 December 2017.
    6. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv: 1606.08923 . Bibcode:2016AJ....152...63N. doi: 10.3847/0004-6256/152/3/63 .
    7. 1 2 3 4 5 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T . Retrieved 22 October 2019.
    8. 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi: 10.1093/pasj/63.5.1117 . (online, AcuA catalog p. 153)
    9. 1 2 3 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 6 December 2017.
    10. 1 2 Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv: 1601.02909 . Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573 . Retrieved 6 December 2017.
    11. 1 2 3 Hanus, J.; Delbo', M.; Alí-Lagoa, V.; Bolin, B.; Jedicke, R.; Durech, J.; et al. (January 2018). "Spin states of asteroids in the Eos collisional family". Icarus. 299: 84–96. arXiv: 1707.05507 . Bibcode:2018Icar..299...84H. doi:10.1016/j.icarus.2017.07.007.
    12. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1075) Helina". Geneva Observatory . Retrieved 6 December 2017.
    13. ↑ 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 6 December 2017.
    14. 1 2 "1075 Helina (1926 SC)". Minor Planet Center. Retrieved 6 December 2017.
    15. ↑ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv: 1502.01628 . Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN   9780816532131.
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