Astronomy Answers: Planetary Phenomena 2023

# Astronomy AnswersPlanetary Phenomena 2023

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The diagram below is explained further on the page for the year 2000.

For an explanation of the above pictures, see the page for the year 2000.

The last table on this page lists a number of noteworthy planetary phenomena during the listed year. The first column ("date") gives the date and hour, in the form year-month-dayThour in the Gregorian calendar, in Universal Time (UT). The second column ("pl") identifies the planet that shows the phenomenon:

pl Planet
Me Mercury
Ve Venus
Ma Mars
Ju Jupiter
Sa Saturn
Ur Uranus
Ne Neptune
Lu Moon

The third column ("*") provides the type of the phenomenon. The fourth column ("AU") shows the value (distance) in Astronomical Units, if applicable. The fifth column ("deg") gives the value of a relevant angle (declination $$δ$$, elongation $$E$$, conjunction spread $$σ$$, or ecliptic longitude $$λ$$) in degrees. Which angle it is for each phenomenon is shown below in column "?". Declinations and ecliptical longitudes are measured relative to the equinox of the date.

 ?
Explanation
p perigee
a apogee
+dδgreatest northern declination
−dδgreatest southern declination
cλconjunction (with the Sun)
oλopposition (relative to the Sun)
eEgreatest elongation
xaλpassage through the ascending node (zero ecliptical latitude)
xdλpassage through the descending node (zero ecliptical latitude)
bσleast conjunction spread (Mercury - Saturn)
Bσleast conjunction spread (Mercury - Neptune)
sσgreatest conjunction spread (Mercury - Saturn)
Sσgreatest conjunction spread (Mercury - Neptune)
Vλbegin eastward (prograde) acceleration
Pgλstationary point: begin eastward (prograde) motion
vλbegin westward (retrograde) acceleration
Rgλstationary point: begin westward (retrograde) motion

The calculations for the planets are based on the VSOP87 model (type A) of Laskar, and the calculations for the Moon are based on the most detailed model from [Meeus]. One position per day was calculated for each celestial object. The hour of the day for each phenomenon was determined by interpolation.

date pl *  AU deg
2023-01-01T03 Lu xa +41.75
2023-01-03T19
**
b  +102.14
2023-01-05T15 Lu +d +27.41
2023-01-06T11 Lu o  +106.37
2023-01-07T00 Me c  +286.95
2023-01-07T06 Me V  +286.62
2023-01-07T20 Me p  0.6704
2023-01-07T21 Lu a 0.002717
2023-01-08T04 Lu V  +126.88
2023-01-09T02 Me +d −19.54
2023-01-11T21
**
S  +139.96
2023-01-12T08 Ma Pg +68.13
2023-01-13T23 Ma −d +24.46
2023-01-15T02
**
s  +104.18
2023-01-15T18 Lu xd +220.08
2023-01-18T01 Me Pg +278.14
2023-01-19T16 Lu −d −27.46
2023-01-20T18 Ur −d +15.98
2023-01-21T08 Lu c  +301.55
2023-01-21T09 Lu p 0.002384
2023-01-21T09 Lu v  +302.21
2023-01-22T08 Ur Pg +44.94
2023-01-25T08
**
B  +88.56
2023-01-28T04 Lu xa +38.81
2023-01-29T21 Me e  −24.94
2023-02-01T20 Lu +d +27.52
2023-02-02T00 Me −d −21.69
2023-02-03T05 Lu V  +112.58
2023-02-03T21 Lu a 0.002717
2023-02-04T23 Me xa +292.16
2023-02-05T06 Lu o  +136.67
2023-02-08T11
**
S  +128.72
2023-02-11T19 Lu xd +216.93
2023-02-16T00 Sa a  10.81
2023-02-16T02 Lu −d −27.64
2023-02-16T04 Sa c  +327.75
2023-02-16T14 Sa v  +327.80
2023-02-18T20 Lu p 0.002395
2023-02-18T20 Lu v  +317.35
2023-02-19T19 Lu c  +331.36
2023-02-22T12
**
B  +73.22
2023-02-24T07 Lu xa +35.85
2023-03-01T02 Lu +d +27.72
2023-03-02T17 Lu V  +115.10
2023-03-03T06 Lu a 0.002713
2023-03-07T00 Lu o  +166.67
2023-03-09T02
**
S  +117.77
2023-03-10T13 Me a  1.369
2023-03-10T20 Lu xd +214.72
2023-03-14T05 Ve xd +27.34
2023-03-15T09 Lu −d −27.84
2023-03-15T11 Ne c  +355.13
2023-03-15T18 Ne v  +355.14
2023-03-16T09 Ne a  30.91
2023-03-17T00 Me o  +356.69
2023-03-18T12 Ma +d +25.61
2023-03-19T02 Lu v  +329.52
2023-03-19T03 Lu p 0.002424
2023-03-20T13
**
b  +78.07
2023-03-21T05 Lu c  +99.26
2023-03-22T17
**
B  +66.30
2023-03-23T00 Me v  +8.71
2023-03-23T14 Lu xa +34.24
2023-03-26T15 Me xd +15.98
2023-03-28T09 Lu +d +27.90
2023-03-30T17 Lu V  +123.37
2023-03-30T23 Lu a 0.002707
2023-04-05T16 Lu o  +196.14
2023-04-07T01 Lu xd +214.02
2023-04-07T04
**
S  +120.15
2023-04-10T18 Ju v  +21.61
2023-04-11T06 Me e  +19.30
2023-04-11T10 Ju c  +21.77
2023-04-11T15 Lu −d −27.95
2023-04-13T02 Ju a  5.955
2023-04-15T13 Lu v  +331.58
2023-04-15T13 Lu p 0.002460
2023-04-19T04 Me +d +19.29
2023-04-19T16 Lu c  +29.87
2023-04-19T20
**
B  +76.63
2023-04-19T23 Lu xa +34.03
2023-04-20T20 Me Rg +45.62
2023-04-24T18 Lu +d +27.96
2023-04-27T18 Lu a 0.002703
2023-04-27T19 Lu V  +132.34
2023-05-01T11 Me c  +41.33
2023-05-02T02 Me V  +40.91
2023-05-03T22 Me xa +39.76
2023-05-04T02 Me p  0.5593
2023-05-04T09 Lu xd +214.06
2023-05-05T04
**
S  +132.09
2023-05-05T05 Lu o  +224.97
2023-05-08T20 Lu −d −27.94
2023-05-09T07 Ur c  +48.95
2023-05-09T10 Ve +d +26.08
2023-05-09T15 Ur a  20.66
2023-05-09T15 Ur v  +48.96
2023-05-10T11 Lu v  +298.64
2023-05-10T17 Lu p 0.002469
2023-05-14T15 Me Pg +35.85
2023-05-17T07 Lu xa +33.98
2023-05-17T10
**
B  +91.23
2023-05-18T17 Me −d +10.64
2023-05-19T03 Lu c  +58.42
2023-05-22T02 Lu +d +27.90
2023-05-25T13 Lu a 0.002704
2023-05-25T20 Lu V  +140.90
2023-05-28T19 Me e  −24.65
2023-05-31T18 Lu xd +213.65
2023-06-02T03
**
S  +148.10
2023-06-03T15 Lu o  +253.29
2023-06-04T03 Ve e  +45.34
2023-06-05T04 Lu −d −27.87
2023-06-06T08 Lu v  +292.56
2023-06-06T11 Lu p 0.002439
2023-06-11T12 Sa +d −10.32
2023-06-13T12 Lu xa +33.07
2023-06-14T08
**
B  +108.02
2023-06-17T03 Sa Rg +337.21
2023-06-17T16 Lu c  +86.74
2023-06-18T09 Lu +d +27.84
2023-06-22T06 Lu a 0.002710
2023-06-22T14 Me xd +81.71
2023-06-22T19 Lu V  +148.61
2023-06-26T15 Ne +d −2.05
2023-06-28T00 Lu xd +211.84
2023-06-29T07 Me v  +96.11
2023-06-30T00 Me +d +24.40
2023-06-30T03 Ne Rg +357.69
2023-06-30T21
**
S  +173.09
2023-07-01T00 Me o  +99.79
2023-07-02T03 Me a  1.328
2023-07-02T13 Lu −d −27.84
2023-07-02T23 Lu o  +281.32
2023-07-03T18 Ve xa +142.75
2023-07-04T08 Lu v  +301.60
2023-07-04T10 Lu p 0.002407
2023-07-10T13 Lu xa +30.80
2023-07-12T10
**
B  +134.46
2023-07-15T14 Lu +d +27.86
2023-07-17T06 Lu c  +114.94
2023-07-19T18 Lu a 0.002716
2023-07-20T13 Lu V  +154.12
2023-07-22T13 Ve Rg +148.61
2023-07-25T03 Lu xd +209.03
2023-07-28T22
**
S  +211.57
2023-07-29T23 Lu −d −27.92
2023-07-30T21 Me xa +153.43
2023-08-01T06 Lu o  +309.28
2023-08-01T15 Lu v  +314.65
2023-08-01T17 Lu p 0.002388
2023-08-06T09 Ve −d +7.06
2023-08-06T14 Lu xa +27.92
2023-08-09T08 Me e  +27.35
2023-08-09T18
**
B  +156.69
2023-08-11T19 Lu +d +27.99
2023-08-12T23 Ve c  +140.47
2023-08-13T01 Ve V  +140.42
2023-08-13T03 Ve p  0.2887
2023-08-15T21 Lu c  +143.29
2023-08-15T23 Lu a 0.002718
2023-08-16T14 Lu V  +151.43
2023-08-21T04 Lu xd +206.40
2023-08-23T07 Me Rg +171.85
2023-08-24T21
**
S  +231.85
2023-08-25T14 Me −d −0.63
2023-08-26T08 Lu −d −28.11
2023-08-26T15 Sa V  +333.85
2023-08-26T20 Sa o  +333.83
2023-08-26T23 Sa p  8.763
2023-08-27T21 Ur +d +18.23
2023-08-28T11 Ur Rg +53.08
2023-08-30T00 Lu v  +329.17
2023-08-30T03 Lu p 0.002388
2023-08-30T13 Lu o  +337.41
2023-08-31T21 Ju +d +15.24
2023-09-02T19 Lu xa +25.75
2023-09-03T02 Me p  0.6279
2023-09-03T13 Ve Pg +132.21
2023-09-04T01 Ju Rg +45.58
2023-09-05T04 Me V  +164.38
2023-09-05T23 Me c  +163.62
2023-09-06T09
**
B  +160.65
2023-09-08T01 Lu +d +28.17
2023-09-12T02 Lu V  +142.61
2023-09-12T04 Lu a 0.002716
2023-09-14T13 Lu c  +171.99
2023-09-15T08 Me Pg +158.01
2023-09-17T07 Lu xd +205.05
2023-09-18T02 Ne p  28.90
2023-09-18T14 Me xd +158.83
2023-09-18T17 Ne V  +356.28
2023-09-18T23 Ne o  +356.27
2023-09-19T04 Ve +d +11.43
2023-09-19T10 Me +d +8.29
2023-09-21T06
**
S  +245.06
2023-09-21T23 Me e  −17.83
2023-09-22T15 Lu −d −28.26
2023-09-27T10 Lu v  +343.70
2023-09-27T12 Lu p 0.002406
2023-09-28T22 Lu o  +215.55
2023-09-30T04 Lu xa +24.89
2023-10-01T19
**
B  +182.29
2023-10-05T08 Lu +d +28.30
2023-10-08T00 Me v  +186.21
2023-10-09T13 Lu V  +144.75
2023-10-09T16 Lu a 0.002710
2023-10-13T19
**
s  +197.77
2023-10-14T05 Lu c  +201.13
2023-10-14T13 Lu xd +204.89
2023-10-15T12
**
S  +287.84
2023-10-17T21 Ma a  2.550
2023-10-19T21 Lu −d −28.31
2023-10-20T00 Me o  +207.03
2023-10-23T11 Ve e  −46.41
2023-10-24T22 Ve xd +165.34
2023-10-25T14 Lu v  +355.21
2023-10-25T14 Lu p 0.002439
2023-10-26T02
**
B  +201.67
2023-10-26T13 Me a  1.435
2023-10-26T20 Me xa +218.33
2023-10-27T15 Lu xa +24.92
2023-10-28T08 Lu o  +35.15
2023-10-31T22 Sa −d −12.91
2023-11-01T09 Ju p  3.982
2023-11-01T17 Lu +d +28.30
2023-11-02T15 Ju V  +40.52
2023-11-02T16 Ju o  +40.51
2023-11-03T17 Sa Pg +330.52
2023-11-05T18
**
S  +309.70
2023-11-06T03 Ma xa +227.50
2023-11-06T10 Lu a 0.002704
2023-11-06T11 Lu V  +151.91
2023-11-10T20 Lu xd +204.88
2023-11-12T21 Lu c  +230.71
2023-11-12T23 Ur p  18.63
2023-11-13T04 Ur V  +51.06
2023-11-13T05 Ur o  +51.06
2023-11-16T02 Lu −d −28.25
2023-11-17T18 Ma c  +235.64
2023-11-20T19
**
B  +161.68
2023-11-20T22 Lu v  +341.97
2023-11-21T08 Lu p 0.002472
2023-11-23T23 Lu xa +24.49
2023-11-26T21 Lu o  +64.87
2023-11-29T02 Lu +d +28.19
2023-11-29T08 Me −d −25.87
2023-12-02T07
**
S  +205.52
2023-12-03T12 Ne −d −3.18
2023-12-04T04 Me e  +21.16
2023-12-04T06 Lu a 0.002703
2023-12-04T13 Lu V  +160.58
2023-12-05T20 Ne Pg +354.89
2023-12-08T03 Lu xd +203.69
2023-12-12T11 Lu c  +260.67
2023-12-12T18 Me Rg +278.49
2023-12-13T09 Lu −d −28.16
2023-12-15T13 Me xd +277.78
2023-12-15T18 Lu v  +307.63
2023-12-16T07 Lu p 0.002459
2023-12-17T08
**
B  +131.45
2023-12-21T01 Lu xa +22.63
2023-12-22T06 Me c  +270.66
2023-12-22T09 Me V  +270.52
2023-12-22T14 Me p  0.6762
2023-12-26T09 Ju −d +12.25
2023-12-26T10 Lu +d +28.14
2023-12-26T12 Lu o  +94.96
2023-12-29T23
**
S  +178.42
2023-12-30T05 Me +d −20.12
2023-12-30T14 Ju Pg +35.58

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Last updated: 2021-07-19