C/2016 R2 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2016 R2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-05-09T13:59:38.526720Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:12:39Z |
| Obs used |
4319 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
9.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-05-29.0000000 |
| e |
0.99630739 |
| q (au) |
2.602364 |
| a (au) |
704.748706 |
| i (deg) |
58.224063 |
| Ω (om, deg) |
80.569029 |
| ω (w, deg) |
33.191899 |
| M (ma, deg) |
0.001023 |
等級
散乱 + 全体線形
$$
M_a = (11.077 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.077 |
| n |
2.000 |
| gf |
0.986 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
1.388 |
| 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 |
| 2016-08-30 |
2017-12-17 |
-1.8617 |
+0.399 |
| 2017-12-17 |
2018-05-08 |
+17.6677 |
-8.756 |
| 2018-05-09 |
2021-06-27 |
+6.0705 |
-4.191 |
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 |
17:10:53.56 |
-15:20:57.6 |
HIP 84058 |
8.45 |
| 2026-02-03 12:00 |
17:10:57.34 |
-15:21:01.2 |
HIP 84058 |
8.22 |
| 2026-02-04 00:00 |
17:11:01.08 |
-15:21:04.7 |
HIP 84058 |
8.09 |
| 2026-02-04 12:00 |
17:11:04.78 |
-15:21:08.0 |
HIP 84058 |
8.06 |
| 2026-02-05 00:00 |
17:11:08.44 |
-15:21:11.3 |
HIP 84058 |
8.13 |
| 2026-02-05 12:00 |
17:11:12.05 |
-15:21:14.4 |
HIP 84058 |
8.28 |
| 2026-02-06 00:00 |
17:11:15.62 |
-15:21:17.4 |
HIP 84058 |
8.52 |
| 2026-02-06 12:00 |
17:11:19.14 |
-15:21:20.3 |
HIP 84058 |
8.83 |
| 2026-02-07 00:00 |
17:11:22.63 |
-15:21:23.1 |
HIP 84058 |
9.20 |
| 2026-02-07 12:00 |
17:11:26.07 |
-15:21:25.8 |
HIP 84058 |
9.63 |
| 2026-02-08 00:00 |
17:11:29.46 |
-15:21:28.3 |
HIP 84058 |
10.10 |
| 2026-02-08 12:00 |
17:11:32.81 |
-15:21:30.8 |
HIP 84058 |
10.60 |
| 2026-02-09 00:00 |
17:11:36.11 |
-15:21:33.1 |
HIP 84058 |
11.13 |
| 2026-02-09 12:00 |
17:11:39.37 |
-15:21:35.4 |
HIP 84058 |
11.68 |
| 2026-02-10 00:00 |
17:11:42.59 |
-15:21:37.5 |
HIP 84058 |
12.25 |
| 2026-02-10 12:00 |
17:11:45.75 |
-15:21:39.5 |
HIP 84058 |
12.83 |
| 2026-02-11 00:00 |
17:11:48.88 |
-15:21:41.5 |
HIP 84058 |
13.42 |
| 2026-02-11 12:00 |
17:11:51.95 |
-15:21:43.3 |
HIP 84058 |
14.02 |
| 2026-02-12 00:00 |
17:11:54.98 |
-15:21:45.0 |
HIP 84058 |
14.62 |
| 2026-02-12 12:00 |
17:11:57.96 |
-15:21:46.6 |
HIP 84190 |
14.94 |
| 2026-02-13 00:00 |
17:12:00.90 |
-15:21:48.1 |
HIP 84190 |
14.54 |
| 2026-02-13 12:00 |
17:12:03.79 |
-15:21:49.5 |
HIP 84190 |
14.18 |
| 2026-02-14 00:00 |
17:12:06.63 |
-15:21:50.8 |
HIP 84190 |
13.85 |
| 2026-02-14 12:00 |
17:12:09.42 |
-15:21:51.9 |
HIP 84190 |
13.54 |
| 2026-02-15 00:00 |
17:12:12.17 |
-15:21:53.0 |
HIP 84190 |
13.27 |
| 2026-02-15 12:00 |
17:12:14.86 |
-15:21:54.0 |
HIP 84190 |
13.03 |
| 2026-02-16 00:00 |
17:12:17.51 |
-15:21:54.9 |
HIP 84190 |
12.82 |
| 2026-02-16 12:00 |
17:12:20.11 |
-15:21:55.7 |
HIP 84190 |
12.64 |
| 2026-02-17 00:00 |
17:12:22.66 |
-15:21:56.3 |
HIP 84190 |
12.49 |
| 2026-02-17 12:00 |
17:12:25.17 |
-15:21:56.9 |
HIP 84190 |
12.37 |
| 2026-02-18 00:00 |
17:12:27.62 |
-15:21:57.4 |
HIP 84190 |
12.28 |
| 2026-02-18 12:00 |
17:12:30.02 |
-15:21:57.8 |
HIP 84190 |
12.21 |
| 2026-02-19 00:00 |
17:12:32.38 |
-15:21:58.1 |
HIP 84190 |
12.17 |
| 2026-02-19 12:00 |
17:12:34.68 |
-15:21:58.3 |
HIP 84190 |
12.16 |
| 2026-02-20 00:00 |
17:12:36.93 |
-15:21:58.4 |
HIP 84190 |
12.17 |
| 2026-02-20 12:00 |
17:12:39.14 |
-15:21:58.4 |
HIP 84190 |
12.20 |
| 2026-02-21 00:00 |
17:12:41.29 |
-15:21:58.3 |
HIP 84190 |
12.25 |
| 2026-02-21 12:00 |
17:12:43.39 |
-15:21:58.1 |
HIP 84190 |
12.32 |
| 2026-02-22 00:00 |
17:12:45.45 |
-15:21:57.9 |
HIP 84190 |
12.41 |
| 2026-02-22 12:00 |
17:12:47.45 |
-15:21:57.5 |
HIP 84190 |
12.51 |
| 2026-02-23 00:00 |
17:12:49.40 |
-15:21:57.0 |
HIP 84190 |
12.62 |
| 2026-02-23 12:00 |
17:12:51.30 |
-15:21:56.5 |
HIP 84190 |
12.75 |
| 2026-02-24 00:00 |
17:12:53.15 |
-15:21:55.9 |
HIP 84190 |
12.88 |