C/2013 TW5 (Spacewatch)
メタデータ
| 項目 |
値 |
| Designation |
C/2013 TW5 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-08-17T15:50:25.054080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:41Z |
| Obs used |
421 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-06-23.0000000 |
| e |
0.98693812 |
| q (au) |
5.830627 |
| a (au) |
446.385044 |
| i (deg) |
31.401407 |
| Ω (om, deg) |
319.703831 |
| ω (w, deg) |
190.375424 |
| M (ma, deg) |
359.994183 |
等級
散乱 + 全体線形
$$
M_a = (11.679 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.679 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.728 |
| k |
0.800 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
18:41:37.00 |
-45:10:05.2 |
HIP 91641 |
5.73 |
| 2026-02-03 12:00 |
18:41:43.59 |
-45:10:12.1 |
HIP 91641 |
6.37 |
| 2026-02-04 00:00 |
18:41:50.14 |
-45:10:19.2 |
HIP 91641 |
7.13 |
| 2026-02-04 12:00 |
18:41:56.65 |
-45:10:26.4 |
HIP 91641 |
7.99 |
| 2026-02-05 00:00 |
18:42:03.14 |
-45:10:33.9 |
HIP 91641 |
8.90 |
| 2026-02-05 12:00 |
18:42:09.59 |
-45:10:41.6 |
HIP 91641 |
9.86 |
| 2026-02-06 00:00 |
18:42:16.01 |
-45:10:49.5 |
HIP 91641 |
10.85 |
| 2026-02-06 12:00 |
18:42:22.39 |
-45:10:57.6 |
HIP 91641 |
11.85 |
| 2026-02-07 00:00 |
18:42:28.74 |
-45:11:05.8 |
HIP 91641 |
12.88 |
| 2026-02-07 12:00 |
18:42:35.05 |
-45:11:14.3 |
HIP 91641 |
13.91 |
| 2026-02-08 00:00 |
18:42:41.33 |
-45:11:23.0 |
HIP 91641 |
14.94 |
| 2026-02-08 12:00 |
18:42:47.57 |
-45:11:31.8 |
HIP 91641 |
15.98 |
| 2026-02-09 00:00 |
18:42:53.78 |
-45:11:40.9 |
HIP 91641 |
17.02 |
| 2026-02-09 12:00 |
18:42:59.95 |
-45:11:50.2 |
HIP 91641 |
18.07 |
| 2026-02-10 00:00 |
18:43:06.08 |
-45:11:59.6 |
HIP 91641 |
19.11 |
| 2026-02-10 12:00 |
18:43:12.18 |
-45:12:09.3 |
HIP 91641 |
20.15 |
| 2026-02-11 00:00 |
18:43:18.23 |
-45:12:19.1 |
HIP 91641 |
21.18 |
| 2026-02-11 12:00 |
18:43:24.25 |
-45:12:29.1 |
HIP 91641 |
22.22 |
| 2026-02-12 00:00 |
18:43:30.23 |
-45:12:39.4 |
HIP 91641 |
23.25 |
| 2026-02-12 12:00 |
18:43:36.18 |
-45:12:49.8 |
HIP 91641 |
24.28 |
| 2026-02-13 00:00 |
18:43:42.08 |
-45:13:00.4 |
HIP 91641 |
25.30 |
| 2026-02-13 12:00 |
18:43:47.94 |
-45:13:11.2 |
HIP 91641 |
26.31 |
| 2026-02-14 00:00 |
18:43:53.77 |
-45:13:22.2 |
HIP 91641 |
27.33 |
| 2026-02-14 12:00 |
18:43:59.55 |
-45:13:33.3 |
HIP 91641 |
28.33 |
| 2026-02-15 00:00 |
18:44:05.29 |
-45:13:44.7 |
HIP 91641 |
29.34 |
| 2026-02-15 12:00 |
18:44:10.99 |
-45:13:56.3 |
HIP 92083 |
30.20 |
| 2026-02-16 00:00 |
18:44:16.65 |
-45:14:08.0 |
HIP 92083 |
29.70 |
| 2026-02-16 12:00 |
18:44:22.27 |
-45:14:19.9 |
HIP 92083 |
29.24 |
| 2026-02-17 00:00 |
18:44:27.85 |
-45:14:32.0 |
HIP 92083 |
28.81 |
| 2026-02-17 12:00 |
18:44:33.38 |
-45:14:44.3 |
HIP 92083 |
28.42 |
| 2026-02-18 00:00 |
18:44:38.87 |
-45:14:56.8 |
HIP 92083 |
28.07 |
| 2026-02-18 12:00 |
18:44:44.32 |
-45:15:09.5 |
HIP 92083 |
27.75 |
| 2026-02-19 00:00 |
18:44:49.72 |
-45:15:22.3 |
HIP 92083 |
27.47 |
| 2026-02-19 12:00 |
18:44:55.08 |
-45:15:35.4 |
HIP 92083 |
27.23 |
| 2026-02-20 00:00 |
18:45:00.39 |
-45:15:48.6 |
HIP 92083 |
27.03 |
| 2026-02-20 12:00 |
18:45:05.66 |
-45:16:02.0 |
HIP 92083 |
26.87 |
| 2026-02-21 00:00 |
18:45:10.89 |
-45:16:15.5 |
HIP 92083 |
26.75 |
| 2026-02-21 12:00 |
18:45:16.07 |
-45:16:29.3 |
HIP 92083 |
26.66 |
| 2026-02-22 00:00 |
18:45:21.20 |
-45:16:43.2 |
HIP 92083 |
26.62 |
| 2026-02-22 12:00 |
18:45:26.29 |
-45:16:57.3 |
HIP 92212 |
26.08 |
| 2026-02-23 00:00 |
18:45:31.34 |
-45:17:11.6 |
HIP 92212 |
25.44 |
| 2026-02-23 12:00 |
18:45:36.33 |
-45:17:26.0 |
HIP 92212 |
24.82 |
| 2026-02-24 00:00 |
18:45:41.28 |
-45:17:40.6 |
HIP 92212 |
24.23 |