Scimago Journal & Country Rank

Astrophysical Journal Letters


United Kingdom

Universities and research institutions in United Kingdom

Subject Area and Category


IOP Publishing Ltd.



Publication type



20418213, 20418205


1991-1993, 1995-2020



How to publish in this journal


The Astrophysical Journal Letters is the premier journal for rapid publication of high-impact astronomical research. ApJL publishes brief reports on the most influential developments across astronomy and astrophysics. The journal specializes in articles that are timely, containing new discoveries and results that have a significant immediate impact on other researchers. Articles published in ApJL are self-contained, including context that is generally understandable by scientists who are not specialists in the particular fields. Join the conversation about this journal

The set of journals have been ranked according to their SJR and divided into four equal groups, four quartiles. Q1 (green) comprises the quarter of the journals with the highest values, Q2 (yellow) the second highest values, Q3 (orange) the third highest values and Q4 (red) the lowest values.

Astronomy and Astrophysics1999Q1
Astronomy and Astrophysics2000Q1
Astronomy and Astrophysics2001Q1
Astronomy and Astrophysics2002Q1
Astronomy and Astrophysics2003Q1
Astronomy and Astrophysics2004Q1
Astronomy and Astrophysics2005Q1
Astronomy and Astrophysics2006Q1
Astronomy and Astrophysics2007Q1
Astronomy and Astrophysics2008Q1
Astronomy and Astrophysics2009Q1
Astronomy and Astrophysics2010Q4
Astronomy and Astrophysics2011Q1
Astronomy and Astrophysics2012Q1
Astronomy and Astrophysics2013Q1
Astronomy and Astrophysics2014Q1
Astronomy and Astrophysics2015Q1
Astronomy and Astrophysics2016Q1
Astronomy and Astrophysics2017Q1
Astronomy and Astrophysics2018Q1
Astronomy and Astrophysics2019Q1
Space and Planetary Science1999Q1
Space and Planetary Science2000Q1
Space and Planetary Science2001Q1
Space and Planetary Science2002Q1
Space and Planetary Science2003Q1
Space and Planetary Science2004Q1
Space and Planetary Science2005Q1
Space and Planetary Science2006Q1
Space and Planetary Science2007Q1
Space and Planetary Science2008Q1
Space and Planetary Science2009Q1
Space and Planetary Science2010Q4
Space and Planetary Science2011Q1
Space and Planetary Science2012Q1
Space and Planetary Science2013Q1
Space and Planetary Science2014Q1
Space and Planetary Science2015Q1
Space and Planetary Science2016Q1
Space and Planetary Science2017Q1
Space and Planetary Science2018Q1
Space and Planetary Science2019Q1

The SJR is a size-independent prestige indicator that ranks journals by their 'average prestige per article'. It is based on the idea that 'all citations are not created equal'. SJR is a measure of scientific influence of journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from It measures the scientific influence of the average article in a journal, it expresses how central to the global scientific discussion an average article of the journal is.

Citations per document

This indicator counts the number of citations received by documents from a journal and divides them by the total number of documents published in that journal. The chart shows the evolution of the average number of times documents published in a journal in the past two, three and four years have been cited in the current year. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

Cites per documentYearValue
Cites / Doc. (4 years)19998.704
Cites / Doc. (4 years)200010.674
Cites / Doc. (4 years)20019.969
Cites / Doc. (4 years)200211.901
Cites / Doc. (4 years)200311.417
Cites / Doc. (4 years)20047.903
Cites / Doc. (4 years)200511.500
Cites / Doc. (4 years)200620.161
Cites / Doc. (4 years)200715.448
Cites / Doc. (4 years)200813.041
Cites / Doc. (4 years)20097.500
Cites / Doc. (4 years)20103.683
Cites / Doc. (4 years)20116.545
Cites / Doc. (4 years)20126.743
Cites / Doc. (4 years)20136.118
Cites / Doc. (4 years)20145.674
Cites / Doc. (4 years)20155.449
Cites / Doc. (4 years)20165.375
Cites / Doc. (4 years)20175.561
Cites / Doc. (4 years)20186.560
Cites / Doc. (4 years)20196.984
Cites / Doc. (3 years)19998.704
Cites / Doc. (3 years)20009.320
Cites / Doc. (3 years)200110.305
Cites / Doc. (3 years)200212.813
Cites / Doc. (3 years)20036.733
Cites / Doc. (3 years)20046.926
Cites / Doc. (3 years)200514.702
Cites / Doc. (3 years)200630.563
Cites / Doc. (3 years)200714.703
Cites / Doc. (3 years)20087.406
Cites / Doc. (3 years)20093.982
Cites / Doc. (3 years)20102.200
Cites / Doc. (3 years)20116.545
Cites / Doc. (3 years)20126.751
Cites / Doc. (3 years)20136.123
Cites / Doc. (3 years)20145.786
Cites / Doc. (3 years)20155.650
Cites / Doc. (3 years)20165.607
Cites / Doc. (3 years)20175.895
Cites / Doc. (3 years)20187.351
Cites / Doc. (3 years)20197.633
Cites / Doc. (2 years)19996.642
Cites / Doc. (2 years)20009.783
Cites / Doc. (2 years)200112.354
Cites / Doc. (2 years)20027.242
Cites / Doc. (2 years)20035.382
Cites / Doc. (2 years)20046.595
Cites / Doc. (2 years)200525.826
Cites / Doc. (2 years)200637.000
Cites / Doc. (2 years)20077.703
Cites / Doc. (2 years)20083.964
Cites / Doc. (2 years)20091.000
Cites / Doc. (2 years)20102.200
Cites / Doc. (2 years)20116.560
Cites / Doc. (2 years)20126.759
Cites / Doc. (2 years)20136.016
Cites / Doc. (2 years)20145.933
Cites / Doc. (2 years)20155.735
Cites / Doc. (2 years)20165.690
Cites / Doc. (2 years)20176.452
Cites / Doc. (2 years)20188.146
Cites / Doc. (2 years)20198.469
Total Cites 

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.
Journal Self-citation is defined as the number of citation from a journal citing article to articles published by the same journal.

Self Cites19997
Self Cites200010
Self Cites20013
Self Cites20023
Self Cites20031
Self Cites20041
Self Cites20052
Self Cites20060
Self Cites20070
Self Cites20080
Self Cites20091
Self Cites20101
Self Cites2011471
Self Cites2012690
Self Cites2013838
Self Cites2014852
Self Cites2015701
Self Cites2016723
Self Cites2017819
Self Cites20181103
Self Cites20191144
Total Cites1999940
Total Cites20001165
Total Cites20011453
Total Cites20021230
Total Cites2003606
Total Cites2004471
Total Cites2005691
Total Cites2006978
Total Cites20071088
Total Cites2008474
Total Cites2009227
Total Cites201011
Total Cites20114994
Total Cites201210215
Total Cites201313343
Total Cites201411995
Total Cites201511244
Total Cites201610872
Total Cites201710988
Total Cites201812790
Total Cites201912968
External Cites per Doc 
Cites per Doc

Evolution of the number of total citation per document and external citation per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years. External citations are calculated by subtracting the number of self-citations from the total number of citations received by the journal’s documents.

External Cites per document19998.639
External Cites per document20009.240
External Cites per document200110.284
External Cites per document200212.781
External Cites per document20036.722
External Cites per document20046.912
External Cites per document200514.660
External Cites per document200630.563
External Cites per document200714.703
External Cites per document20087.406
External Cites per document20093.965
External Cites per document20102.000
External Cites per document20115.928
External Cites per document20126.295
External Cites per document20135.739
External Cites per document20145.375
External Cites per document20155.298
External Cites per document20165.234
External Cites per document20175.455
External Cites per document20186.717
External Cites per document20196.959
Cites per document19998.704
Cites per document20009.320
Cites per document200110.305
Cites per document200212.813
Cites per document20036.733
Cites per document20046.926
Cites per document200514.702
Cites per document200630.563
Cites per document200714.703
Cites per document20087.406
Cites per document20093.982
Cites per document20102.200
Cites per document20116.545
Cites per document20126.751
Cites per document20136.123
Cites per document20145.786
Cites per document20155.650
Cites per document20165.607
Cites per document20175.895
Cites per document20187.351
Cites per document20197.633
% International Collaboration

International Collaboration accounts for the articles that have been produced by researchers from several countries. The chart shows the ratio of a journal's documents signed by researchers from more than one country; that is including more than one country address.

YearInternational Collaboration
Citable documents 
Non-citable documents

Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.

Non-citable documents199918
Non-citable documents200014
Non-citable documents200116
Non-citable documents200213
Non-citable documents200313
Non-citable documents200413
Non-citable documents200511
Non-citable documents20067
Non-citable documents20076
Non-citable documents20084
Non-citable documents20093
Non-citable documents20101
Non-citable documents20116
Non-citable documents201215
Non-citable documents201326
Non-citable documents201435
Non-citable documents201537
Non-citable documents201632
Non-citable documents201728
Non-citable documents201828
Non-citable documents201928
Citable documents1999108
Citable documents2000125
Citable documents2001141
Citable documents200296
Citable documents200390
Citable documents200468
Citable documents200547
Citable documents200632
Citable documents200774
Citable documents200864
Citable documents200957
Citable documents20105
Citable documents2011763
Citable documents20121513
Citable documents20132179
Citable documents20142073
Citable documents20151990
Citable documents20161939
Citable documents20171864
Citable documents20181740
Citable documents20191699
Cited documents 
Uncited documents

Ratio of a journal's items, grouped in three years windows, that have been cited at least once vs. those not cited during the following year.

Uncited documents199956
Uncited documents200065
Uncited documents200180
Uncited documents200273
Uncited documents200378
Uncited documents200463
Uncited documents200551
Uncited documents200630
Uncited documents200732
Uncited documents200824
Uncited documents200920
Uncited documents20104
Uncited documents201161
Uncited documents2012109
Uncited documents2013184
Uncited documents2014200
Uncited documents2015221
Uncited documents2016225
Uncited documents2017189
Uncited documents2018167
Uncited documents2019169
Cited documents199970
Cited documents200074
Cited documents200177
Cited documents200236
Cited documents200325
Cited documents200418
Cited documents20057
Cited documents20069
Cited documents200748
Cited documents200844
Cited documents200940
Cited documents20102
Cited documents2011708
Cited documents20121419
Cited documents20132021
Cited documents20141908
Cited documents20151806
Cited documents20161746
Cited documents20171703
Cited documents20181601
Cited documents20191558
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