55 Cancri
55 Cancri (/ˈkæŋkraɪ/ atau /ˈkæŋkriː/), juga dikatalogkan menjadi Rho1 Cancri atau disingkat 55 Cnc, adalah sebuah bintang binari yang berjarak sekitar 41 tahun cahaya jauhnya dari Bumi di rasi bintang Cancer. Sistem tersebut terdiri dari sebuah bintang jenis G dan sebuah planet katai merah yang lebih kecil, yang dipisahkan oleh lebih dari 1,000 UA (seribu kali jauhnya dari Bumi ke Matahari).
 Sebuah tangga bintang di rasi bintang Cancer yang memperlihatkan posisi 55 Cancri (dilingkari) | |
| Data pengamatan Epos J2000.0 Ekuinoks J2000.0 | |
|---|---|
| Rasi bintang | Cancer |
| 55 Cancri A | |
| Asensio rekta | 08j 52m 35.81d[1] |
| Deklinasi | +28° 19′ 51.0″[1] |
| Magnitudo semu (V) | 5.95 |
| 55 Cancri B | |
| Asensio rekta | 08j 52m 40.9d |
| Deklinasi | +28° 19′ 59″ |
| Magnitudo semu (V) | 13.15 |
| Ciri-ciri | |
| Kelas spektrum | G8V / M3.5-4V |
| Indeks warna U−B | 0.65 / 1.66 |
| Indeks warna B−V | 0.86 / 1.21 |
| Astrometri | |
| Kecepatan radial (Rv) | 27.3 km/s |
| Gerak diri (μ) | RA: -485.80 ± 0.97[1] mdb/thn Dek.: -234.05 ± 0.68[1] mdb/thn |
| Paralaks (π) | 81,03±0,75[1] mdb |
| Jarak | 40,3 ± 0,4 tc (12,3 ± 0,1 pc) |
| Magnitudo mutlak (MV) | 5.46 / 12.66 |
| Detail | |
| Massa | 0.95 ± 0.1 / 0.13 M☉ |
| Radius | 1.152 ± 0.035[2] / 0.30 R☉ |
| Luminositas | 0.57 ± 0.01[3] L☉ |
| Luminositas (bolometrik) | 0.63 / 0.0076 L☉ |
| Suhu | 5373 ± 9.7[4] K |
| Rotasi | 42.2 d |
| Usia | (7.4–8.7) × 109[5] tahun |
| Penamaan lain | |
| Referensi basis data | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
| Extrasolar Planets Encyclopaedia | data |
Pada 2011, lima eksoplanet dikonfirmasikan mengorbiti objek primer tersebut, 55 Cancri A (planet katai kuning). Sistem 55 Cancri adalah yang pertama diketahui memiliki empat, dan kemudian lima planet, dan mungkin memiliki lebih dari itu.
Sistem planetarium
Perbandingan orbit-orbit planet dalam 55 Cancri A (hitam) dengan planet-planet di Tata Surya.
Pada 1997, penemuan 51 Pegasi yang mirip planet yang mengorbit 55 Cancri A diumumkan, bersama dengan planet Tau Boötis dan planet dalam Upsilon Andromedae.[6]
| Anggota (diurut dari bintang) |
Massa | Sumbu semimayor (AU) |
Periode orbit (hari) |
Eksentrisitas | Inklinasi | Jari-jari |
|---|---|---|---|---|---|---|
| e | 8.63 ± 0.35 M⊕ | 0.01560 ± 0.00011 | 0.736537 ± 0.000013 | 0.17 ± 0.04 | 83.4 ± 1.7° | 2.00 ± 0.14 R⊕ |
| b | 0.825 ± 0.003 MJ | 0.1148 ± 0.0008 | 14.6507 ± 0.0004 | 0.010 ± 0.003 | ~85° | — |
| c | ≥0.171 ± 0.004 MJ | 0.2403 ± 0.0017 | 44.364 ± 0.007 | 0.005 ± 0.003 | — | — |
| f | ≥0.155 ± 0.008 MJ | 0.781 ± 0.006 | 259.8 ± 0.5 | 0.30 ± 0.05 | — | — |
| d | ≥3.82 ± 0.04 MJ | 5.74 ± 0.04 | 5169 ± 53 | 0.014 ± 0.009 | — | — |
Komunikasi
Sebuah pesan METI dikirimkan ke 55 Cancri. Pesan tersebut ditransmisikan dari radar terbesar di Eurasia – Radar Planetarium Eupatoria 70-meter (230-kaki). Pesan tersebut dinamai Cosmic Call 2, pesan tersebut dikirm pada 6 Juli 2003, dan pesan tersebut akan datang ke 55 Cancri pada Mei 2044.[9]
Referensi
- van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry - van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal. 694 (2): 1085–1098. arXiv:0901.1206 . Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085.
- Boyajian, Tabetha S.; et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 31, arXiv:1306.2974 , Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, 40. See Table 3.
- Kovtyukh, V. V.; et al. (2003). "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios". Astronomy and Astrophysics. 411 (3): 559–564. arXiv:astro-ph/0308429 . Bibcode:2003A&A...411..559K. doi:10.1051/0004-6361:20031378.
- Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal. 687 (2): 1264–1293. arXiv:0807.1686 . Bibcode:2008ApJ...687.1264M. doi:10.1086/591785.
- Butler, R. Paul; et al. (1997). "Three New 51 Pegasi Type Planets". The Astrophysical Journal Letters. 474 (2): L115–L118. Bibcode:1997ApJ...474L.115B. doi:10.1086/310444.
- Winn, Joshua N.; et al. (2011). "A Super-Earth Transiting a Naked-Eye Star". The Astrophysical Journal Letters. 737 (1). article number L18. arXiv:1104.5230 . Bibcode:2011ApJ...737L..18W. doi:10.1088/2041-8205/737/1/L18.
- Dawson, Rebekah I.; Fabrycky, Daniel C. "Radial velocity planets de-aliased. A new, short period for Super-Earth 55 Cnc e". The Astrophysical Journal. 722: 937–953. arXiv:1005.4050 . Bibcode:2010ApJ...722..937D. doi:10.1088/0004-637X/722/1/937.
- "Передача и поиски разумных сигналов во Вселенной". Cplire.ru. Diakses tanggal 2008-09-14.
- von Braun, Kaspar; Tabetha, S. Boyajian; ten Brummelaar, Theo; Kane, Stephen R.; van Belle, Gerard T.; Ciardi, David R.; Raymond, Sean N.; López-Morales, Mercedes; McAlister, Harold A.; Schaefer, Gail (2011). "55 Cancri: Stellar Astrophysical Parameters, a Planet in the Habitable Zone, and Implications for the Radius of a Transiting Super-Earth". The Astrophysical Journal. 740 (1): 49–54. arXiv:1106.1152 . Bibcode:2011ApJ...740...49V. doi:10.1088/0004-637X/740/1/49.
- Eggenberger, A.; et al. (2003). "Planets in Binaries". Scientific Frontiers in Research on Extrasolar Planets. 294: 43–46. Bibcode:2003ASPC..294...43E.
- Jean Schneider (2011). "Notes for Planet 55 Cnc b". Extrasolar Planets Encyclopaedia. Diakses tanggal 8 October 2011.
- Fischer, Debra A.; et al. (2008). "Five Planets Orbiting 55 Cancri". The Astrophysical Journal. 675 (1): 790–801. arXiv:0712.3917 . Bibcode:2008ApJ...675..790F. doi:10.1086/525512.
- Jayawardhana, Ray; et al. (2002). "New Submillimeter Limits on Dust in the 55 Cancri Planetary System". The Astrophysical Journal Letters. 570 (2): L93–L96. arXiv:astro-ph/0204140 . Bibcode:2002ApJ...570L..93J. doi:10.1086/341101.
- McArthur, Barbara E.; et al. (2004). "Detection of a NEPTUNE-mass planet in the ρ1 Cnc system using the Hobby-Eberly Telescope". The Astrophysical Journal Letters. 614 (1): L81–L84. arXiv:astro-ph/0408585 . Bibcode:2004ApJ...614L..81M. doi:10.1086/425561.
- Marcy, Geoffrey W.; et al. (2002). "A planet at 5 AU Around 55 Cancri". The Astrophysical Journal. 581 (2): 1375–1388. arXiv:astro-ph/0207294 . Bibcode:2002ApJ...581.1375M. doi:10.1086/344298.
- Raghavan, Deepak; et al. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems". The Astrophysical Journal. 646 (1): 523–542. arXiv:astro-ph/0603836 . Bibcode:2006ApJ...646..523R. doi:10.1086/504823.
- Raymond, Sean N.; et al. (2008). "A dynamical perspective on additional planets in 55 Cancri". The Astrophysical Journal. 689: 478–491. arXiv:0808.3295 . Bibcode:2008ApJ...689..478R. doi:10.1086/592772.
- Schneider, G.; et al. (2001). "NICMOS Coronagraphic Observations of 55 Cancri". The Astronomical Journal. 121 (1): 525–537. arXiv:astro-ph/0010175 . Bibcode:2001AJ....121..525S. doi:10.1086/318050.
- "Astronomers Discover Record Fifth Planet Around Nearby Star 55 Cancri". Sciencedaily.com. November 6, 2007. Diarsipkan dari versi asli tanggal 2008-09-26. Diakses tanggal 2008-09-14.
- Trilling, David E.; Brown, Robert H. (1998). "A circumstellar dust disk around a star with a known planetary companion" (PDF). Nature. 395 (6704): 775–777. Bibcode:1998Natur.395..775T. doi:10.1038/27389.
- William I. Hartkopf & Brian D. Mason. "Addressing confusion in double star nomenclature: The Washington Multiplicity Catalog". United States Naval Observatory. Diarsipkan dari versi asli tanggal 2011-05-17. Diakses tanggal 2011-10-08.
Bacaan tambahan
- Marcy, Geoffrey W.; Butler, R. Paul; Fischer, Debra A.; Laughlin, Greg; Vogt, Steven S.; Henry, Gregory W.; Pourbaix, Dimitri (2002). "A Planet at 5 AU around 55 Cancri". The Astrophysical Journal. 581 (2): 1375–1388. arXiv:astro-ph/0207294 . Bibcode:2002ApJ...581.1375M. doi:10.1086/344298. ISSN 0004-637X.
- Fischer, Debra A.; Marcy, Geoffrey W.; Butler, R. Paul; Vogt, Steven S.; Laughlin, Greg; Henry, Gregory W.; Abouav, David; Peek, Kathryn M. G.; Wright, Jason T.; Johnson, John A.; McCarthy, Chris; Isaacson, Howard (2008). "Five Planets Orbiting 55 Cancri". The Astrophysical Journal. 675 (1): 790–801. arXiv:0712.3917 . Bibcode:2008ApJ...675..790F. doi:10.1086/525512. ISSN 0004-637X.
- Ji, Jianghui; Kinoshita, Hiroshi; Liu, Lin; Li, Guangyu (2003). "Could the 55 Cancri Planetary System Really Be in the 3[rcolon]1 Mean Motion Resonance?". The Astrophysical Journal. 585 (2): L139–L142. arXiv:astro-ph/0301636 . Bibcode:2003ApJ...585L.139J. doi:10.1086/374391. ISSN 0004-637X.
- Schneider, G.; Becklin, E. E.; Smith, B. A.; Weinberger, A. J.; Silverstone, M.; Hines, D. C. (2001). "NICMOS Coronagraphic Observations of 55 Cancri". The Astronomical Journal. 121 (1): 525–537. arXiv:astro-ph/0010175 . Bibcode:2001AJ....121..525S. doi:10.1086/318050. ISSN 0004-6256.
- Jayawardhana, Ray; Holland, Wayne S.; Kalas, Paul; Greaves, Jane S.; Dent, William R. F.; Wyatt, Mark C.; Marcy, Geoffrey W. (2002). "New Submillimeter Limits on Dust in the 55 Cancri Planetary System". The Astrophysical Journal. 570 (2): L93–L96. arXiv:astro-ph/0204140 . Bibcode:2002ApJ...570L..93J. doi:10.1086/341101. ISSN 0004-637X.
- Zhou, Li-Yong; J. Lehto, Harry; Sun, Yi-Sui; Zheng, Jia-Qing (2004). "Apsidal corotation in mean motion resonance: the 55 Cancri system as an example". Monthly Notices of the Royal Astronomical Society. 350 (4): 1495–1502. arXiv:astro-ph/0310121 . Bibcode:2004MNRAS.350.1495Z. doi:10.1111/j.1365-2966.2004.07755.x. ISSN 0035-8711.
- Jayawardhana, Ray; Holland, Wayne S.; Greaves, Jane S.; Dent, William R. F.; Marcy, Geoffrey W.; Hartmann, Lee W.; Fazio, Giovanni G. (2000). "Dust in the 55 Cancri Planetary System". The Astrophysical Journal. 536 (1): 425–428. arXiv:astro-ph/0001275 . Bibcode:2000ApJ...536..425J. doi:10.1086/308942. ISSN 0004-637X.
- Rasio, F. A.; Ford, E. B. (1996). "Dynamical Instabilities and the Formation of Extrasolar Planetary Systems". Science. 274 (5289): 954–956. Bibcode:1996Sci...274..954R. doi:10.1126/science.274.5289.954. ISSN 0036-8075.
- von Bloh, W.; Cuntz, M.; Franck, S.; Bounama, C. (2003). "On the Possibility of Earth-Type Habitable Planets in the 55 Cancri System". Astrobiology. 3 (4): 681–688. Bibcode:2003AsBio...3..681V. doi:10.1089/153110703322736015. ISSN 1531-1074.
- Ji, Jiang-Hui; Kinoshita, Hiroshi; Liu, Lin; Li, Guang-Yu (2009). "The dynamical architecture and habitable zones of the quintuplet planetary system 55 Cancri". Research in Astronomy and Astrophysics. 9 (6): 703–711. arXiv:0902.4328 . Bibcode:2009RAA.....9..703J. doi:10.1088/1674-4527/9/6/009. ISSN 1674-4527.
- Raymond, Sean N.; Barnes, Rory; Gorelick, Noel (2008). "A Dynamical Perspective on Additional Planets in 55 Cancri". The Astrophysical Journal. 689 (1): 478–491. arXiv:0808.3295 . Bibcode:2008ApJ...689..478R. doi:10.1086/592772. ISSN 0004-637X.
- Marzari, F.; Scholl, H.; Tricarico, P. (2005). "Frequency map analysis of the 3/1 resonance between planets b and c in the 55 Cancri system". Astronomy and Astrophysics. 442 (1): 359–364. Bibcode:2005A&A...442..359M. doi:10.1051/0004-6361:20053164. ISSN 0004-6361.
Pranala luar
Wikimedia Commons memiliki media mengenai 55 Cancri.
- "55 (Rho1) Cancri 2". SolStation. Diarsipkan dari versi asli tanggal 2008-06-25. Diakses tanggal 2008-06-12.
- Jean Schneider (2011). "Notes for star 55 Cnc". Extrasolar Planets Encyclopaedia. Diakses tanggal 8 October 2011.
- "55 Cancri". University of Illinois. The Planet Project. Diarsipkan dari versi asli tanggal 2008-05-17. Diakses tanggal 2008-06-12.
- Sanders, Robert (2004-08-31). "Astronomers searching for distant Earths find two Neptunes". UC Berkeley News. Diarsipkan dari versi asli tanggal 2008-05-16. Diakses tanggal 2008-06-12.
- Ward Glen (2007-11-08). "Astronomers Find Fifth Planet Around 55 Cancri". The Starry Mirror. Diakses tanggal 2008-06-12.
- When the Gods Fall 55 Cancri in fiction.
- Extrasolar Planet Interactions by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona
- The First and the second part of a computer animation of the 55 Cancri planetary system.
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Templat:Sistem bintang terdekat Templat:Bintang Cancer
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