Table A.1
Summary of relative angular measurements of Neptune against nearby stars corrected by Gaia catalogs.
| Ref. | Gaia | Source ID | Date | PA | Sep. | Star RA |  |
Star Dec. |  |
Rej. |
|---|---|---|---|---|---|---|---|---|---|---|
| [UTC] | (θ) [º] | (ρ)[″] | (α★) [º] | [ mas] | (δ★) [º] | [mas] | ||||
| Barnard (1906) | DR3 | 3376830900184589312 | 1904-02-16 05:48:07 | 59.85 | – | 95.06700337 | 2.4 | 22.30908127 | 3.1 | No |
| 1904-02-16 05:51:44 | – | 30.78 | 95.06700337 | 2.4 | 22.30908127 | 3.1 | No | |||
| 1904-02-16 05:55:11 | – | 29.99 | 95.06700337 | 2.4 | 22.30908127 | 3.1 | No | |||
| 1904-02-17 05:50:21 | 81.76 | – | 95.06700337 | 2.4 | 22.30908127 | 3.1 | No | |||
| 1904-02-17 05:54:47 | – | 79.07 | 95.06700337 | 2.4 | 22.30908127 | 3.1 | No | |||
| 1904-02-17 05:58:09 | – | 78.96 | 95.06700337 | 2.4 | 22.30908127 | 3.1 | No | |||
| 3379173414006162176 | 1904-12-06 05:37:55 | 282.84 | – | 99.37215445 | 4.4 | 22.14920636 | 5.3 | No | ||
| 1904-12-06 05:43:43 | – | 175.96 | 99.37215445 | 4.4 | 22.14920636 | 5.3 | No | |||
| 1904-12-06 05:47:18 | – | 175.42 | 99.37215445 | 4.4 | 22.14920636 | 5.3 | No | |||
| Barnard (1907) | DR3 | 3378595105247894528 | 1907-02-11 07:05:42 | 349.94 | – | 102.46333962 | 2.2 | 22.07660363 | 2.6 | No |
| 1907-02-11 07:10:05 | – | 58.48 | 102.46333962 | 2.2 | 22.07660363 | 2.6 | No | |||
| 1907-02-11 07:12:53 | – | 58.49 | 102.46333962 | 2.2 | 22.07660363 | 2.6 | No | |||
| 1907-02-13 06:46:58 | 71.22 | – | 102.46333943 | 2.2 | 22.07660357 | 2.6 | No | |||
| 1907-02-13 06:51:32 | – | 133.67 | 102.46333943 | 2.2 | 22.07660357 | 2.6 | No | |||
| 1907-02-13 06:54:54 | – | 134.51 | 102.46333943 | 2.2 | 22.07660357 | 2.6 | No | |||
| Barnard (1909) | DR3 | 3367926921881503488 | 1908-03-30 02:09:42 | 307.91 | – | 104.42607400 | 3.8 | 21.99028624 | 4.1 | No |
| 1908-03-30 02:09:42 | – | 62.38 | 104.42607400 | 3.8 | 21.99028624 | 4.1 | No | |||
| 1908-03-30 02:09:42 | – | 62.70 | 104.42607400 | 3.8 | 21.99028624 | 4.1 | No | |||
| Barnard (1912) | DR3 | 673117105811025024 | 1910-10-31 09:51:13 | 311.96 | – | 114.51440844 | 1.7 | 20.88495345 | 2.1 | No |
| 1910-10-31 09:57:01 | – | 8.51 | 114.51440844 | 1.7 | 20.88495345 | 2.1 | No | |||
| 1910-10-31 10:00:57 | – | 8.42 | 114.51440844 | 1.7 | 20.88495345 | 2.1 | No | |||
| 864959237493629696 | 1911-01-11 04:38:36 | 87.47 | – | 113.09517983 | 3.2 | 21.10473568 | 3.3 | No | ||
| 1911-01-11 04:42:04 | – | 151.67 | 113.09517983 | 3.2 | 21.10473568 | 3.3 | No | |||
| 1911-01-11 04:45:41 | – | 151.43 | 113.09517983 | 3.2 | 21.10473568 | 3.3 | No | |||
| 673131743059399168 | 1912-02-20 05:34:29 | 45.59 | – | 114.41414289 | 1.6 | 21.01593133 | 2.1 | No | ||
| 1912-02-20 05:36:47 | – | 179.25 | 114.41414289 | 1.6 | 21.01593133 | 2.1 | No | |||
| Barnard (1916) | DR3 | 663304651728603136 | 1915-10-22 10:02:39 | 319.49 | – | 126.02260358 | 2.6 | 19.01526555 | 3.7 | No |
| 1915-10-22 10:09:28 | – | 26.66 | 126.02260358 | 2.6 | 19.01526555 | 3.7 | No | |||
| 669552317315147904 | 1916-03-09 03:24:20 | 81.91 | – | 123.48381213 | 3.6 | 19.58886808 | 4.8 | No | ||
| 1916-03-09 03:36:34 | – | 13.80 | 123.48381213 | 3.6 | 19.58886808 | 4.8 | No | |||
| Barnard (1919) | DR3 | 662625256621828608 | 1918-03-17 04:50:44 | 31.66 | – | 128.00619071 | 1.6 | 18.71566323 | 2.1 | No |
| 1918-03-17 04:55:14 | – | 19.12 | 128.00619071 | 1.6 | 18.71566323 | 2.1 | No | |||
| 659414854466737280 | 1919-03-23 02:46:12 | 327.07 | – | 130.21402916 | 1.4 | 18.25035184 | 1.8 | No | ||
| 1919-03-23 02:50:52 | – | 51.88 | 130.21402916 | 1.4 | 18.25035184 | 1.8 | No | |||
| Barnard (1927) | DR3 | 610959239591366528 | 1920-12-24 07:03:26 | 229.16 | – | 136.94095403 | 2.5 | 16.52916090 | 2.8 | No |
| 1920-12-24 07:09:12 | – | 30.78 | 136.94095403 | 2.5 | 16.52916090 | 2.8 | No | |||
| 611573419914461824 | 1921-03-30 02:55:32 | 217.46 | – | 134.67521042 | 1.4 | 17.19398702 | 1.7 | No | ||
| 1921-03-30 03:01:45 | – | 25.96 | 134.67521042 | 1.4 | 17.19398702 | 1.7 | No | |||
| 631652525166042624 | 1922-01-01 07:44:27 | 312.23 | – | 139.01999836 | 5.1 | 16.00753139 | 5.3 | No | ||
| 1922-01-01 07:52:52 | – | 112.37 | 139.01999836 | 5.1 | 16.00753139 | 5.3 | No | |||
| DR2 | 607697985023089408 | 1922-01-18 06:58:12 | 304.37 | – | 138.60845047 | 123.6 | 16.13116169 | 92.5 | No | |
| 1922-01-18 07:05:20 | – | 107.43 | 138.60845047 | 123.6 | 16.13116169 | 92.5 | No | |||
| 1922-01-20 05:49:31 | 87.26 | – | 138.60845046 | 123.6 | 16.13116166 | 92.5 | No | |||
| 1922-01-20 05:59:24 | – | 90.85 | 138.60845046 | 123.6 | 16.13116166 | 92.5 | No | |||
| 1922-01-22 05:26:44 | 101.25 | – | 138.60845044 | 123.6 | 16.13116162 | 92.5 | No | |||
| 1922-01-22 05:38:13 | – | 286.05 | 138.60845044 | 123.6 | 16.13116162 | 92.5 | Yes | |||
| DR3 | 607950902761885184 | 1922-02-15 02:56:50 | 306.48 | – | 137.84087092 | 1.4 | 16.36782187 | 1.7 | No | |
| 1922-02-15 03:04:22 | – | 115.12 | 137.84087092 | 1.4 | 16.36782187 | 1.7 | No | |||
| 610963603277572864 | 1922-05-10 02:39:50 | 140.11 | – | 136.87710926 | 2.0 | 16.61036669 | 2.4 | Yes | ||
| 1922-05-10 02:47:34 | – | 248.06 | 136.87710926 | 2.0 | 16.61036669 | 2.4 | No | |||
Notes. PA is the position angle of the apparent position of the star relative to Neptune; Sep. is the angular separation between the apparent positions of the star and Neptune; Star RA and Dec. are the ICRF-referenced right ascension (α★) and declination (δ★) of the star, respectively; 
and 
are the catalog-derived formal uncertainties in α★ (multiplied by cos δ★) and δ★, respectively; and Rej. is rejection flag in orbit-fit solution.
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