C/2017 M5 (TOTAS)
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
$$
M_a = (2.478 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.478 |
| n |
6.000 |
| gf |
0.801 |
| gb |
-0.884 |
| k |
1.000 |
| δ90 |
3.757 |
| 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 |
+11.7631 |
-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) |
| 2026-02-03 00:00 |
03:32:52.80 |
+13:06:19.6 |
HIP 16534 |
7.87 |
| 2026-02-03 12:00 |
03:32:52.83 |
+13:06:25.0 |
HIP 16534 |
7.96 |
| 2026-02-04 00:00 |
03:32:52.92 |
+13:06:30.7 |
HIP 16534 |
8.05 |
| 2026-02-04 12:00 |
03:32:53.06 |
+13:06:36.5 |
HIP 16534 |
8.15 |
| 2026-02-05 00:00 |
03:32:53.26 |
+13:06:42.6 |
HIP 16534 |
8.25 |
| 2026-02-05 12:00 |
03:32:53.52 |
+13:06:48.9 |
HIP 16534 |
8.35 |
| 2026-02-06 00:00 |
03:32:53.83 |
+13:06:55.4 |
HIP 16534 |
8.45 |
| 2026-02-06 12:00 |
03:32:54.21 |
+13:07:02.1 |
HIP 16534 |
8.56 |
| 2026-02-07 00:00 |
03:32:54.64 |
+13:07:09.0 |
HIP 16534 |
8.68 |
| 2026-02-07 12:00 |
03:32:55.13 |
+13:07:16.2 |
HIP 16534 |
8.79 |
| 2026-02-08 00:00 |
03:32:55.67 |
+13:07:23.5 |
HIP 16534 |
8.92 |
| 2026-02-08 12:00 |
03:32:56.28 |
+13:07:31.1 |
HIP 16534 |
9.05 |
| 2026-02-09 00:00 |
03:32:56.94 |
+13:07:38.9 |
HIP 16534 |
9.18 |
| 2026-02-09 12:00 |
03:32:57.66 |
+13:07:46.8 |
HIP 16534 |
9.33 |
| 2026-02-10 00:00 |
03:32:58.44 |
+13:07:55.0 |
HIP 16534 |
9.48 |
| 2026-02-10 12:00 |
03:32:59.27 |
+13:08:03.4 |
HIP 16534 |
9.63 |
| 2026-02-11 00:00 |
03:33:00.16 |
+13:08:12.0 |
HIP 16534 |
9.80 |
| 2026-02-11 12:00 |
03:33:01.11 |
+13:08:20.8 |
HIP 16534 |
9.98 |
| 2026-02-12 00:00 |
03:33:02.12 |
+13:08:29.8 |
HIP 16534 |
10.16 |
| 2026-02-12 12:00 |
03:33:03.18 |
+13:08:39.0 |
HIP 16534 |
10.36 |
| 2026-02-13 00:00 |
03:33:04.30 |
+13:08:48.4 |
HIP 16534 |
10.57 |
| 2026-02-13 12:00 |
03:33:05.48 |
+13:08:58.0 |
HIP 16534 |
10.79 |
| 2026-02-14 00:00 |
03:33:06.71 |
+13:09:07.8 |
HIP 16534 |
11.02 |
| 2026-02-14 12:00 |
03:33:08.01 |
+13:09:17.9 |
HIP 16534 |
11.27 |
| 2026-02-15 00:00 |
03:33:09.35 |
+13:09:28.0 |
HIP 16534 |
11.52 |
| 2026-02-15 12:00 |
03:33:10.76 |
+13:09:38.4 |
HIP 16534 |
11.80 |
| 2026-02-16 00:00 |
03:33:12.22 |
+13:09:49.0 |
HIP 16534 |
12.08 |
| 2026-02-16 12:00 |
03:33:13.74 |
+13:09:59.8 |
HIP 16534 |
12.38 |
| 2026-02-17 00:00 |
03:33:15.32 |
+13:10:10.8 |
HIP 16534 |
12.69 |
| 2026-02-17 12:00 |
03:33:16.95 |
+13:10:21.9 |
HIP 16534 |
13.02 |
| 2026-02-18 00:00 |
03:33:18.64 |
+13:10:33.3 |
HIP 16534 |
13.37 |
| 2026-02-18 12:00 |
03:33:20.38 |
+13:10:44.8 |
HIP 16534 |
13.73 |
| 2026-02-19 00:00 |
03:33:22.18 |
+13:10:56.5 |
HIP 16534 |
14.10 |
| 2026-02-19 12:00 |
03:33:24.03 |
+13:11:08.4 |
HIP 16534 |
14.49 |
| 2026-02-20 00:00 |
03:33:25.95 |
+13:11:20.5 |
HIP 16534 |
14.89 |
| 2026-02-20 12:00 |
03:33:27.91 |
+13:11:32.8 |
HIP 16534 |
15.32 |
| 2026-02-21 00:00 |
03:33:29.93 |
+13:11:45.2 |
HIP 16534 |
15.75 |
| 2026-02-21 12:00 |
03:33:32.01 |
+13:11:57.9 |
HIP 16534 |
16.20 |
| 2026-02-22 00:00 |
03:33:34.14 |
+13:12:10.7 |
HIP 16534 |
16.67 |
| 2026-02-22 12:00 |
03:33:36.33 |
+13:12:23.6 |
HIP 16534 |
17.16 |
| 2026-02-23 00:00 |
03:33:38.57 |
+13:12:36.8 |
HIP 16534 |
17.66 |
| 2026-02-23 12:00 |
03:33:40.87 |
+13:12:50.1 |
HIP 16534 |
18.17 |
| 2026-02-24 00:00 |
03:33:43.22 |
+13:13:03.6 |
HIP 16534 |
18.70 |