メタデータ
| 項目 |
値 |
| Designation |
C/2016 A1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-11-23T08:54:05.518080Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T01:12:15Z |
| Obs used |
2143 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
9.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-11-13.0000000 |
| e |
1.00196775 |
| q (au) |
5.327762 |
| a (au) |
-2707.536844 |
| i (deg) |
121.185405 |
| Ω (om, deg) |
128.174457 |
| ω (w, deg) |
10.320070 |
| M (ma, deg) |
-0.000073 |
等級
散乱 + 全体線形
$$
M_a = (5.402 + 3.724\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.402 |
| n |
3.724 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2016-01-01 |
2017-11-22 |
-2.3519 |
+1.891 |
| 2017-11-26 |
2019-03-10 |
-2.2345 |
+1.488 |
| 2019-03-10 |
2020-02-15 |
+16.2456 |
-13.536 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
21:46:56.76 |
+34:19:42.0 |
HIP 107510 |
6.75 |
| 2026-07-29 12:00 |
21:46:49.75 |
+34:19:28.3 |
HIP 107510 |
5.40 |
| 2026-07-30 00:00 |
21:46:42.72 |
+34:19:14.1 |
HIP 107510 |
4.13 |
| 2026-07-30 12:00 |
21:46:35.68 |
+34:18:59.1 |
HIP 107510 |
3.02 |
| 2026-07-31 00:00 |
21:46:28.61 |
+34:18:43.6 |
HIP 107510 |
2.36 |
| 2026-07-31 12:00 |
21:46:21.53 |
+34:18:27.4 |
HIP 107510 |
2.52 |
| 2026-08-01 00:00 |
21:46:14.43 |
+34:18:10.7 |
HIP 107510 |
3.40 |
| 2026-08-01 12:00 |
21:46:07.32 |
+34:17:53.3 |
HIP 107510 |
4.61 |
| 2026-08-02 00:00 |
21:46:00.19 |
+34:17:35.2 |
HIP 107510 |
5.95 |
| 2026-08-02 12:00 |
21:45:53.04 |
+34:17:16.6 |
HIP 107421 |
5.92 |
| 2026-08-03 00:00 |
21:45:45.88 |
+34:16:57.3 |
HIP 107421 |
4.49 |
| 2026-08-03 12:00 |
21:45:38.71 |
+34:16:37.5 |
HIP 107421 |
3.13 |
| 2026-08-04 00:00 |
21:45:31.52 |
+34:16:16.9 |
HIP 107421 |
2.01 |
| 2026-08-04 12:00 |
21:45:24.32 |
+34:15:55.8 |
HIP 107421 |
1.69 |
| 2026-08-05 00:00 |
21:45:17.10 |
+34:15:34.0 |
HIP 107421 |
2.52 |
| 2026-08-05 12:00 |
21:45:09.88 |
+34:15:11.7 |
HIP 107421 |
3.82 |
| 2026-08-06 00:00 |
21:45:02.64 |
+34:14:48.7 |
HIP 107421 |
5.25 |
| 2026-08-06 12:00 |
21:44:55.39 |
+34:14:25.0 |
HIP 107421 |
6.73 |
| 2026-08-07 00:00 |
21:44:48.14 |
+34:14:00.8 |
HIP 107421 |
8.24 |
| 2026-08-07 12:00 |
21:44:40.87 |
+34:13:35.9 |
HIP 107421 |
9.77 |
| 2026-08-08 00:00 |
21:44:33.59 |
+34:13:10.4 |
HIP 107421 |
11.31 |
| 2026-08-08 12:00 |
21:44:26.31 |
+34:12:44.3 |
HIP 107421 |
12.85 |
| 2026-08-09 00:00 |
21:44:19.01 |
+34:12:17.5 |
HIP 107421 |
14.41 |
| 2026-08-09 12:00 |
21:44:11.71 |
+34:11:50.2 |
HIP 107421 |
15.97 |
| 2026-08-10 00:00 |
21:44:04.41 |
+34:11:22.2 |
HIP 107421 |
17.54 |
| 2026-08-10 12:00 |
21:43:57.09 |
+34:10:53.5 |
HIP 107421 |
19.11 |
| 2026-08-11 00:00 |
21:43:49.78 |
+34:10:24.3 |
HIP 107161 |
19.07 |
| 2026-08-11 12:00 |
21:43:42.45 |
+34:09:54.5 |
HIP 107161 |
17.48 |
| 2026-08-12 00:00 |
21:43:35.13 |
+34:09:24.0 |
HIP 107161 |
15.88 |
| 2026-08-12 12:00 |
21:43:27.80 |
+34:08:52.9 |
HIP 107161 |
14.28 |
| 2026-08-13 00:00 |
21:43:20.46 |
+34:08:21.2 |
HIP 107161 |
12.67 |
| 2026-08-13 12:00 |
21:43:13.13 |
+34:07:48.9 |
HIP 107161 |
11.06 |
| 2026-08-14 00:00 |
21:43:05.79 |
+34:07:15.9 |
HIP 107161 |
9.45 |
| 2026-08-14 12:00 |
21:42:58.45 |
+34:06:42.4 |
HIP 107161 |
7.83 |
| 2026-08-15 00:00 |
21:42:51.11 |
+34:06:08.2 |
HIP 107161 |
6.21 |
| 2026-08-15 12:00 |
21:42:43.77 |
+34:05:33.4 |
HIP 107161 |
4.58 |
| 2026-08-16 00:00 |
21:42:36.44 |
+34:04:58.1 |
HIP 107161 |
2.96 |
| 2026-08-16 12:00 |
21:42:29.10 |
+34:04:22.1 |
HIP 107161 |
1.34 |
| 2026-08-17 00:00 |
21:42:21.77 |
+34:03:45.5 |
HIP 107161 |
0.43 |
| 2026-08-17 12:00 |
21:42:14.44 |
+34:03:08.3 |
HIP 107161 |
1.99 |
| 2026-08-18 00:00 |
21:42:07.11 |
+34:02:30.5 |
HIP 107161 |
3.62 |
| 2026-08-18 12:00 |
21:41:59.79 |
+34:01:52.2 |
HIP 107161 |
5.27 |
| 2026-08-19 00:00 |
21:41:52.47 |
+34:01:13.2 |
HIP 107161 |
6.91 |