メタデータ
| 項目 |
値 |
| Designation |
C/2016 C1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-02-19T07:06:40.415040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:23Z |
| Obs used |
236 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
8.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-08-02.0000000 |
| e |
1.00512425 |
| q (au) |
8.462645 |
| a (au) |
-1651.490288 |
| i (deg) |
56.178888 |
| Ω (om, deg) |
181.780057 |
| ω (w, deg) |
328.739361 |
| M (ma, deg) |
0.007779 |
等級
散乱 + 全体線形
$$
M_a = (0.005 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
0.005 |
| n |
6.000 |
| gf |
0.992 |
| gb |
-0.940 |
| k |
1.000 |
| δ90 |
9.998 |
| 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 |
| 2016-03-01 |
2020-05-24 |
+17.7344 |
-16.764 |
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) |
| 2026-09-20 00:00 |
16:26:41.20 |
+30:15:57.7 |
HIP 80489 |
11.39 |
| 2026-09-20 12:00 |
16:26:44.43 |
+30:14:59.4 |
HIP 80489 |
12.13 |
| 2026-09-21 00:00 |
16:26:47.71 |
+30:14:01.3 |
HIP 80489 |
12.94 |
| 2026-09-21 12:00 |
16:26:51.03 |
+30:13:03.3 |
HIP 80489 |
13.82 |
| 2026-09-22 00:00 |
16:26:54.40 |
+30:12:05.5 |
HIP 80489 |
14.75 |
| 2026-09-22 12:00 |
16:26:57.81 |
+30:11:07.8 |
HIP 80489 |
15.73 |
| 2026-09-23 00:00 |
16:27:01.27 |
+30:10:10.3 |
HIP 80489 |
16.75 |
| 2026-09-23 12:00 |
16:27:04.77 |
+30:09:13.0 |
HIP 80489 |
17.80 |
| 2026-09-24 00:00 |
16:27:08.32 |
+30:08:15.8 |
HIP 80489 |
18.88 |
| 2026-09-24 12:00 |
16:27:11.92 |
+30:07:18.8 |
HIP 80489 |
19.99 |
| 2026-09-25 00:00 |
16:27:15.56 |
+30:06:22.0 |
HIP 80489 |
21.11 |
| 2026-09-25 12:00 |
16:27:19.24 |
+30:05:25.3 |
HIP 80489 |
22.26 |
| 2026-09-26 00:00 |
16:27:22.97 |
+30:04:28.8 |
HIP 80747 |
23.29 |
| 2026-09-26 12:00 |
16:27:26.74 |
+30:03:32.5 |
HIP 80747 |
22.52 |
| 2026-09-27 00:00 |
16:27:30.55 |
+30:02:36.4 |
HIP 80747 |
21.79 |
| 2026-09-27 12:00 |
16:27:34.41 |
+30:01:40.5 |
HIP 80747 |
21.10 |
| 2026-09-28 00:00 |
16:27:38.31 |
+30:00:44.8 |
HIP 80747 |
20.45 |
| 2026-09-28 12:00 |
16:27:42.26 |
+29:59:49.2 |
HIP 80747 |
19.85 |
| 2026-09-29 00:00 |
16:27:46.25 |
+29:58:53.9 |
HIP 80747 |
19.30 |
| 2026-09-29 12:00 |
16:27:50.28 |
+29:57:58.8 |
HIP 80747 |
18.81 |
| 2026-09-30 00:00 |
16:27:54.35 |
+29:57:03.8 |
HIP 80747 |
18.38 |
| 2026-09-30 12:00 |
16:27:58.47 |
+29:56:09.1 |
HIP 80747 |
18.03 |
| 2026-10-01 00:00 |
16:28:02.62 |
+29:55:14.6 |
HIP 80747 |
17.75 |
| 2026-10-01 12:00 |
16:28:06.83 |
+29:54:20.4 |
HIP 80747 |
17.54 |
| 2026-10-02 00:00 |
16:28:11.07 |
+29:53:26.3 |
HIP 80747 |
17.43 |
| 2026-10-02 12:00 |
16:28:15.35 |
+29:52:32.5 |
HIP 80747 |
17.39 |
| 2026-10-03 00:00 |
16:28:19.68 |
+29:51:38.9 |
HIP 80747 |
17.45 |
| 2026-10-03 12:00 |
16:28:24.04 |
+29:50:45.5 |
HIP 80747 |
17.59 |
| 2026-10-04 00:00 |
16:28:28.45 |
+29:49:52.4 |
HIP 80747 |
17.81 |
| 2026-10-04 12:00 |
16:28:32.90 |
+29:48:59.5 |
HIP 80747 |
18.12 |
| 2026-10-05 00:00 |
16:28:37.39 |
+29:48:06.9 |
HIP 80747 |
18.51 |
| 2026-10-05 12:00 |
16:28:41.92 |
+29:47:14.5 |
HIP 80747 |
18.97 |
| 2026-10-06 00:00 |
16:28:46.49 |
+29:46:22.4 |
HIP 80747 |
19.51 |
| 2026-10-06 12:00 |
16:28:51.10 |
+29:45:30.5 |
HIP 80747 |
20.11 |
| 2026-10-07 00:00 |
16:28:55.75 |
+29:44:38.9 |
HIP 80747 |
20.77 |
| 2026-10-07 12:00 |
16:29:00.43 |
+29:43:47.5 |
HIP 80747 |
21.49 |
| 2026-10-08 00:00 |
16:29:05.16 |
+29:42:56.4 |
HIP 80747 |
22.26 |
| 2026-10-08 12:00 |
16:29:09.93 |
+29:42:05.6 |
HIP 80747 |
23.08 |
| 2026-10-09 00:00 |
16:29:14.73 |
+29:41:15.1 |
HIP 80747 |
23.94 |
| 2026-10-09 12:00 |
16:29:19.58 |
+29:40:24.8 |
HIP 80747 |
24.83 |
| 2026-10-10 00:00 |
16:29:24.46 |
+29:39:34.8 |
HIP 80747 |
25.77 |
| 2026-10-10 12:00 |
16:29:29.38 |
+29:38:45.2 |
HIP 80747 |
26.73 |
| 2026-10-11 00:00 |
16:29:34.34 |
+29:37:55.8 |
HIP 80941 |
27.36 |