C/2016 A1 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
21:42:45.04 |
+31:17:31.6 |
HIP 107165 |
12.94 |
| 2026-02-03 12:00 |
21:42:51.34 |
+31:17:27.7 |
HIP 107165 |
13.52 |
| 2026-02-04 00:00 |
21:42:57.65 |
+31:17:24.3 |
HIP 107165 |
14.19 |
| 2026-02-04 12:00 |
21:43:03.96 |
+31:17:21.6 |
HIP 107165 |
14.95 |
| 2026-02-05 00:00 |
21:43:10.28 |
+31:17:19.4 |
HIP 107165 |
15.78 |
| 2026-02-05 12:00 |
21:43:16.60 |
+31:17:17.7 |
HIP 107165 |
16.68 |
| 2026-02-06 00:00 |
21:43:22.92 |
+31:17:16.6 |
HIP 107165 |
17.62 |
| 2026-02-06 12:00 |
21:43:29.25 |
+31:17:16.1 |
HIP 107165 |
18.61 |
| 2026-02-07 00:00 |
21:43:35.58 |
+31:17:16.2 |
HIP 107165 |
19.64 |
| 2026-02-07 12:00 |
21:43:41.92 |
+31:17:16.8 |
HIP 107165 |
20.69 |
| 2026-02-08 00:00 |
21:43:48.25 |
+31:17:18.0 |
HIP 107165 |
21.78 |
| 2026-02-08 12:00 |
21:43:54.59 |
+31:17:19.7 |
HIP 107165 |
22.89 |
| 2026-02-09 00:00 |
21:44:00.93 |
+31:17:22.0 |
HIP 107165 |
24.02 |
| 2026-02-09 12:00 |
21:44:07.27 |
+31:17:24.8 |
HIP 107165 |
25.17 |
| 2026-02-10 00:00 |
21:44:13.62 |
+31:17:28.2 |
HIP 107165 |
26.33 |
| 2026-02-10 12:00 |
21:44:19.96 |
+31:17:32.2 |
HIP 107165 |
27.51 |
| 2026-02-11 00:00 |
21:44:26.30 |
+31:17:36.7 |
HIP 107165 |
28.70 |
| 2026-02-11 12:00 |
21:44:32.64 |
+31:17:41.7 |
HIP 107165 |
29.90 |
| 2026-02-12 00:00 |
21:44:38.98 |
+31:17:47.3 |
HIP 107165 |
31.11 |
| 2026-02-12 12:00 |
21:44:45.32 |
+31:17:53.4 |
HIP 107165 |
32.32 |
| 2026-02-13 00:00 |
21:44:51.66 |
+31:18:00.1 |
HIP 107165 |
33.55 |
| 2026-02-13 12:00 |
21:44:57.99 |
+31:18:07.3 |
HIP 107592 |
33.24 |
| 2026-02-14 00:00 |
21:45:04.32 |
+31:18:15.0 |
HIP 107592 |
31.88 |
| 2026-02-14 12:00 |
21:45:10.65 |
+31:18:23.3 |
HIP 107592 |
30.52 |
| 2026-02-15 00:00 |
21:45:16.98 |
+31:18:32.2 |
HIP 107592 |
29.17 |
| 2026-02-15 12:00 |
21:45:23.30 |
+31:18:41.5 |
HIP 107592 |
27.81 |
| 2026-02-16 00:00 |
21:45:29.61 |
+31:18:51.4 |
HIP 107592 |
26.45 |
| 2026-02-16 12:00 |
21:45:35.92 |
+31:19:01.8 |
HIP 107592 |
25.09 |
| 2026-02-17 00:00 |
21:45:42.23 |
+31:19:12.8 |
HIP 107592 |
23.74 |
| 2026-02-17 12:00 |
21:45:48.52 |
+31:19:24.2 |
HIP 107592 |
22.39 |
| 2026-02-18 00:00 |
21:45:54.82 |
+31:19:36.2 |
HIP 107592 |
21.03 |
| 2026-02-18 12:00 |
21:46:01.10 |
+31:19:48.7 |
HIP 107592 |
19.68 |
| 2026-02-19 00:00 |
21:46:07.38 |
+31:20:01.8 |
HIP 107592 |
18.34 |
| 2026-02-19 12:00 |
21:46:13.65 |
+31:20:15.3 |
HIP 107592 |
16.99 |
| 2026-02-20 00:00 |
21:46:19.91 |
+31:20:29.3 |
HIP 107592 |
15.65 |
| 2026-02-20 12:00 |
21:46:26.16 |
+31:20:43.9 |
HIP 107592 |
14.32 |
| 2026-02-21 00:00 |
21:46:32.40 |
+31:20:59.0 |
HIP 107592 |
12.99 |
| 2026-02-21 12:00 |
21:46:38.64 |
+31:21:14.5 |
HIP 107592 |
11.67 |
| 2026-02-22 00:00 |
21:46:44.86 |
+31:21:30.6 |
HIP 107592 |
10.36 |
| 2026-02-22 12:00 |
21:46:51.07 |
+31:21:47.1 |
HIP 107592 |
9.07 |
| 2026-02-23 00:00 |
21:46:57.27 |
+31:22:04.2 |
HIP 107592 |
7.81 |
| 2026-02-23 12:00 |
21:47:03.46 |
+31:22:21.8 |
HIP 107592 |
6.59 |
| 2026-02-24 00:00 |
21:47:09.64 |
+31:22:39.8 |
HIP 107592 |
5.44 |