• Title/Summary/Keyword: astronomical distance

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THE NEED OF DISTANCE LEARNING FOR ASTRONOMY DEVELOPMENT IN INDONESIA

  • YAMANI, AVIVAH;MALASAN, HAKIM L.
    • Publications of The Korean Astronomical Society
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    • v.30 no.2
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    • pp.715-718
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    • 2015

  • Astronomy is a popular topic for the public in term of astronomical phenomenon such as occultations, solar and lunar eclipses or meteor showers. In term of education, astronomy also is popular as one of the world Science Olympiads. Social media, as the new trend in communicating and connecting people, plays a significant role in increasing the size of the astronomy community. Beyond IYA 2009, more and more astronomy activities have been done in many places in Indonesia. New astronomy communities have been formed in several cities and public engagement is also high in social media especially on Facebook and Twitter. In this paper, we will discuss the lesson learned from astronomy outreach achievements in Indonesia and the need for citizen science projects as a distance learning tool for the public as part of astronomy development in Indonesia. We argue and propose that this project will be also important up to a regional scope.

  • https://doi.org/10.5303/PKAS.2015.30.2.715 인용 PDF KSCI

APPLICATION OF CEPHEIDS TO DISTANCE SCALE: EXTENDING TO ULTRA-LONG PERIOD CEPHEIDS

  • NGEOW, CHOW-CHOONG
    • Publications of The Korean Astronomical Society
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    • v.30 no.2
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    • pp.371-374
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    • 2015

  • Classical Cepheids (hereafter Cepheids) belong to a class of important variable stars that can be used to determine distances to nearby galaxies via the famous period-luminosity (PL) relations, i.e. the Leavitt Law. In turn, these distances can then be used to calibrate a host of secondary distance indicators located well within the Hubble flow, and ultimately determine the Hubble constant in a manner independent of the Cosmic Microwave Background (CMB) measurements. Some recent progress in determining the Hubble constant to within ~ 3% level via the Cepheid-based distance scale ladder (the SH0ES and the Carnegie Hubble Program) were first summarized in this Proceeding, followed by a brief discussion on the prospect of using ultra-long period Cepheids (ULPC) in future distance scale work. ULPC are those Cepheids with periods longer than 80 days, which seem to follow a different PL relation than their shorter period Cepheids. It has been suggested that ULPC can be used to determine the Hubble constant in "one-step". However, based on the two ULPCs found in M31, it was found that the large dispersion in derived distance moduli leads to a less accurate distance modulus to M31 compared to the classical Cepheids. This finding might raise an alert regarding the use of ULPCs in future distance scale work.

  • https://doi.org/10.5303/PKAS.2015.30.2.371 인용 PDF KSCI

ON THE SPACING PATTERN OF PLANETS AND SATELLITES

  • La, Daile
    • Journal of The Korean Astronomical Society
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    • v.25 no.2
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    • pp.105-109
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    • 1992

  • We show that spacing patterns of planets and satellites in the solar system are formulatable in a single form. It is suggested that a possible explanation for the rule might be the orbital resonance effect, which has existed at an earlier epoch of the solar (planet) system. By extrapolating the formulated spacing patterns beyond the sun-Pluto distance, we find the sun-Planet X distance falls in a range ($46{\sim}79$) A. U..

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