メタデータ
| 項目 |
値 |
| Designation |
C/2017 M5 (TOTAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-06-02T22:39:17.565120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:35Z |
| Obs used |
461 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
10.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-04-23.0000000 |
| e |
1.00373842 |
| q (au) |
5.989567 |
| a (au) |
-1602.163329 |
| i (deg) |
15.884843 |
| Ω (om, deg) |
216.263268 |
| ω (w, deg) |
92.657463 |
| M (ma, deg) |
-0.000629 |
等級
散乱 + 全体線形
$$
M_a = (2.460 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.460 |
| n |
6.000 |
| gf |
0.895 |
| gb |
-0.884 |
| k |
1.000 |
| δ90 |
3.916 |
| 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 |
| 2016-03-06 |
2018-05-22 |
+9.8447 |
-8.185 |
| 2018-08-08 |
2019-12-02 |
+11.7630 |
-9.198 |
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) |
| 2026-06-01 00:00 |
03:52:33.69 |
+14:16:46.5 |
HIP 18158 |
8.13 |
| 2026-06-01 12:00 |
03:52:40.85 |
+14:17:02.6 |
HIP 18158 |
6.90 |
| 2026-06-02 00:00 |
03:52:48.01 |
+14:17:18.6 |
HIP 18158 |
5.93 |
| 2026-06-02 12:00 |
03:52:55.15 |
+14:17:34.5 |
HIP 18158 |
5.38 |
| 2026-06-03 00:00 |
03:53:02.29 |
+14:17:50.3 |
HIP 18158 |
5.38 |
| 2026-06-03 12:00 |
03:53:09.41 |
+14:18:05.9 |
HIP 18158 |
5.91 |
| 2026-06-04 00:00 |
03:53:16.53 |
+14:18:21.4 |
HIP 18158 |
6.86 |
| 2026-06-04 12:00 |
03:53:23.63 |
+14:18:36.8 |
HIP 18158 |
8.08 |
| 2026-06-05 00:00 |
03:53:30.73 |
+14:18:52.0 |
HIP 18158 |
9.46 |
| 2026-06-05 12:00 |
03:53:37.81 |
+14:19:07.2 |
HIP 18158 |
10.94 |
| 2026-06-06 00:00 |
03:53:44.88 |
+14:19:22.2 |
HIP 18158 |
12.49 |
| 2026-06-06 12:00 |
03:53:51.93 |
+14:19:37.1 |
HIP 18158 |
14.07 |
| 2026-06-07 00:00 |
03:53:58.98 |
+14:19:51.8 |
HIP 18158 |
15.68 |
| 2026-06-07 12:00 |
03:54:06.01 |
+14:20:06.4 |
HIP 18158 |
17.31 |
| 2026-06-08 00:00 |
03:54:13.02 |
+14:20:20.9 |
HIP 18158 |
18.96 |
| 2026-06-08 12:00 |
03:54:20.03 |
+14:20:35.3 |
HIP 18158 |
20.61 |
| 2026-06-09 00:00 |
03:54:27.02 |
+14:20:49.5 |
HIP 18158 |
22.27 |
| 2026-06-09 12:00 |
03:54:33.99 |
+14:21:03.6 |
HIP 18158 |
23.93 |
| 2026-06-10 00:00 |
03:54:40.95 |
+14:21:17.5 |
HIP 18158 |
25.59 |
| 2026-06-10 12:00 |
03:54:47.90 |
+14:21:31.3 |
HIP 18158 |
27.26 |
| 2026-06-11 00:00 |
03:54:54.83 |
+14:21:45.0 |
HIP 18158 |
28.92 |
| 2026-06-11 12:00 |
03:55:01.74 |
+14:21:58.6 |
HIP 18158 |
30.59 |
| 2026-06-12 00:00 |
03:55:08.64 |
+14:22:12.0 |
HIP 18158 |
32.25 |
| 2026-06-12 12:00 |
03:55:15.52 |
+14:22:25.2 |
HIP 18158 |
33.91 |
| 2026-06-13 00:00 |
03:55:22.38 |
+14:22:38.3 |
HIP 18158 |
35.57 |
| 2026-06-13 12:00 |
03:55:29.23 |
+14:22:51.3 |
HIP 18158 |
37.23 |
| 2026-06-14 00:00 |
03:55:36.06 |
+14:23:04.2 |
HIP 18158 |
38.88 |
| 2026-06-14 12:00 |
03:55:42.87 |
+14:23:16.9 |
HIP 18551 |
38.32 |
| 2026-06-15 00:00 |
03:55:49.66 |
+14:23:29.4 |
HIP 18551 |
36.84 |
| 2026-06-15 12:00 |
03:55:56.43 |
+14:23:41.8 |
HIP 18551 |
35.36 |
| 2026-06-16 00:00 |
03:56:03.19 |
+14:23:54.1 |
HIP 18551 |
33.91 |
| 2026-06-16 12:00 |
03:56:09.92 |
+14:24:06.2 |
HIP 18551 |
32.49 |
| 2026-06-17 00:00 |
03:56:16.64 |
+14:24:18.1 |
HIP 18551 |
31.08 |
| 2026-06-17 12:00 |
03:56:23.33 |
+14:24:30.0 |
HIP 18551 |
29.71 |
| 2026-06-18 00:00 |
03:56:30.00 |
+14:24:41.6 |
HIP 18551 |
28.36 |
| 2026-06-18 12:00 |
03:56:36.66 |
+14:24:53.1 |
HIP 18551 |
27.05 |
| 2026-06-19 00:00 |
03:56:43.29 |
+14:25:04.5 |
HIP 18551 |
25.78 |
| 2026-06-19 12:00 |
03:56:49.90 |
+14:25:15.7 |
HIP 18551 |
24.55 |
| 2026-06-20 00:00 |
03:56:56.48 |
+14:25:26.8 |
HIP 18551 |
23.37 |
| 2026-06-20 12:00 |
03:57:03.05 |
+14:25:37.7 |
HIP 18551 |
22.25 |
| 2026-06-21 00:00 |
03:57:09.59 |
+14:25:48.5 |
HIP 18551 |
21.19 |
| 2026-06-21 12:00 |
03:57:16.11 |
+14:25:59.1 |
HIP 18551 |
20.20 |
| 2026-06-22 00:00 |
03:57:22.60 |
+14:26:09.5 |
HIP 18551 |
19.30 |