编辑“︁PSR B1257+12”︁（章节）

=== PSR B1257+12 C ===
{{Planetbox begin 
| name = PSR B1257+12C
}}
{{Planetbox image
| image = Exoplanet Comparison PSR B1257+12 C.png
| caption = Size comparison of PSR B1257+12 C with Earth and Neptune.
<br/>(Based on selected hypothetical [[:File:Exoplanet Comparison PSR B1257+12 C.png#Summary|modeled compositions]])  
}}
{{Planetbox star
| star = [[PSR B1257+12]]
| constell = [[室女座]]
| RA = {{RA|13|00|01}}
| DEC = {{DEC|+12|40|57}}
| dist_ly =  980
| dist_pc = 300
| class = 脈衝星
| mass = assumed 1.4
| radius = ~0.00002
| age = 0.8
}}
{{Planetbox orbit 
| semimajor = 0.46<ref name="konacki2003">{{cite journal | url=http://www.iop.org/EJ/article/1538-4357/591/2/L147/17269.html | author=Konacki, M., Wolszczan, A. | title=Masses and Orbital Inclinations of Planets in the PSR B1257+12 System | journal=The [[Astrophysical Journal]] | volume=591 | issue=2 | pages=L147–L150 | year=2003 | doi=10.1086/377093 | bibcode=2003ApJ...591L.147K | arxiv=astro-ph/0305536 | access-date=2012-01-13 | archive-date=2020-01-04 | archive-url=https://web.archive.org/web/20200104010006/http://www.iop.org/EJ/article/1538-4357/591/2/L147/17269.html | dead-url=no }}</ref>
| eccentricity = 0.0252 ± 0.0002<ref name="konacki2003"/>
| period = 98.2114 ± 0.0002<ref name="konacki2003"/>
| arg_peri = 108.3 ± 0.5<ref name="konacki2003"/>
| t_peri = 2,449,766.5 ± 0.1<ref name="konacki2003"/>
| inclination = 47 ± 3<ref name="konacki2003"/><ref group="note">確定軌道傾角的方式包含了簡併法，因為無法確認行星是順時針或逆時針運動，軌道傾角另一個互補值是133 ± 3°。</ref>
}}
{{Planetbox character 
| mass_earth = 3.9 ± 0.2<ref name="konacki2003"/>
}} 
{{Planetbox discovery 
| discovery_date = 1992年1月22日
| discoverers = [[亞歷山大·沃爾茲森]]
| discovery_method = 脈衝星計時法
| discovery_site = {{flag|Poland}}
| discovery_status = 已出版論文
}}
{{Planetbox reference
| star = PSR+1257%2B12
| planet = d
}}
{{Planetbox end}}
'''[[PSR 1257+12 C]]'''（{{lang|en|'''PSR B1257+12 d'''}}）又名'''梦星'''的平均日距為0.46 AU，比行星B遠0.1 AU，質量約為地球3.9倍，半徑約為9800公里，其公轉週期為98.2114天，表面溫度約1119-1148K。<ref name="konacki2003"/>在PSR B1257+12 A於1994年被發現之前，這顆行星是人類已知質量最低的行星。儘管如此，其質量仍然大於地球3倍。<ref>{{Cite journal|title=A planetary system around the millisecond pulsar PSR1257 + 12|url=http://www.nature.com/articles/355145a0|last=Wolszczan|first=A.|last2=Frail|first2=D. A.|date=1992-01|journal=[[自然 (期刊)|Nature]]|issue=6356|doi=10.1038/355145a0|volume=355|pages=145–147|language=en|bibcode=1992Natur.355..145W|issn=0028-0836|access-date=2020-10-15|archive-date=2021-02-08|archive-url=https://web.archive.org/web/20210208045309/https://www.nature.com/articles/355145a0|dead-url=no}}</ref>

[[File:PSR B1257+12 C.jpg|thumb|left|280px|PSR B1257+12 C]]{{clear}}