メタデータ
| 項目 |
値 |
| Designation |
P/2013 YG46 (Spacewatch) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-01-19T12:53:16.437120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:44Z |
| Obs used |
55 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-01-29.0000000 |
| e |
0.45164645 |
| q (au) |
1.815243 |
| a (au) |
3.310351 |
| i (deg) |
8.219141 |
| Ω (om, deg) |
56.868085 |
| ω (w, deg) |
232.796581 |
| M (ma, deg) |
182.197613 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-06-01 00:00 |
07:44:06.56 |
+27:30:02.3 |
HIP 37826 |
35.41 |
| 2026-06-01 12:00 |
07:44:31.46 |
+27:28:42.0 |
HIP 37826 |
34.54 |
| 2026-06-02 00:00 |
07:44:56.45 |
+27:27:21.5 |
HIP 37826 |
34.59 |
| 2026-06-02 12:00 |
07:45:21.51 |
+27:26:00.7 |
HIP 37826 |
35.57 |
| 2026-06-03 00:00 |
07:45:46.65 |
+27:24:39.7 |
HIP 37826 |
37.41 |
| 2026-06-03 12:00 |
07:46:11.88 |
+27:23:18.4 |
HIP 37886 |
39.99 |
| 2026-06-04 00:00 |
07:46:37.18 |
+27:21:56.9 |
HIP 37886 |
39.65 |
| 2026-06-04 12:00 |
07:47:02.56 |
+27:20:35.2 |
HIP 38228 |
38.32 |
| 2026-06-05 00:00 |
07:47:28.02 |
+27:19:13.1 |
HIP 38228 |
32.76 |
| 2026-06-05 12:00 |
07:47:53.55 |
+27:17:50.9 |
HIP 38228 |
27.27 |
| 2026-06-06 00:00 |
07:48:19.16 |
+27:16:28.4 |
HIP 38228 |
21.96 |
| 2026-06-06 12:00 |
07:48:44.85 |
+27:15:05.6 |
HIP 38228 |
16.98 |
| 2026-06-07 00:00 |
07:49:10.61 |
+27:13:42.6 |
HIP 38228 |
12.76 |
| 2026-06-07 12:00 |
07:49:36.44 |
+27:12:19.3 |
HIP 38228 |
10.34 |
| 2026-06-08 00:00 |
07:50:02.34 |
+27:10:55.8 |
HIP 38228 |
10.98 |
| 2026-06-08 12:00 |
07:50:28.32 |
+27:09:32.0 |
HIP 38228 |
14.31 |
| 2026-06-09 00:00 |
07:50:54.37 |
+27:08:07.9 |
HIP 38228 |
18.98 |
| 2026-06-09 12:00 |
07:51:20.49 |
+27:06:43.6 |
HIP 38228 |
24.24 |
| 2026-06-10 00:00 |
07:51:46.67 |
+27:05:19.1 |
HIP 38228 |
29.78 |
| 2026-06-10 12:00 |
07:52:12.93 |
+27:03:54.3 |
HIP 38538 |
24.82 |
| 2026-06-11 00:00 |
07:52:39.25 |
+27:02:29.2 |
HIP 38538 |
20.02 |
| 2026-06-11 12:00 |
07:53:05.64 |
+27:01:03.9 |
HIP 38538 |
16.05 |
| 2026-06-12 00:00 |
07:53:32.10 |
+26:59:38.4 |
HIP 38538 |
13.70 |
| 2026-06-12 12:00 |
07:53:58.62 |
+26:58:12.6 |
HIP 38538 |
13.84 |
| 2026-06-13 00:00 |
07:54:25.21 |
+26:56:46.5 |
HIP 38679 |
12.56 |
| 2026-06-13 12:00 |
07:54:51.86 |
+26:55:20.2 |
HIP 38679 |
10.16 |
| 2026-06-14 00:00 |
07:55:18.57 |
+26:53:53.6 |
HIP 38679 |
11.12 |
| 2026-06-14 12:00 |
07:55:45.34 |
+26:52:26.8 |
HIP 38679 |
14.81 |
| 2026-06-15 00:00 |
07:56:12.18 |
+26:50:59.7 |
HIP 38679 |
19.77 |
| 2026-06-15 12:00 |
07:56:39.07 |
+26:49:32.4 |
HIP 38679 |
25.27 |
| 2026-06-16 00:00 |
07:57:06.02 |
+26:48:04.8 |
HIP 38679 |
31.04 |
| 2026-06-16 12:00 |
07:57:33.04 |
+26:46:37.0 |
HIP 38679 |
36.96 |
| 2026-06-17 00:00 |
07:58:00.10 |
+26:45:08.9 |
HIP 38832 |
42.06 |
| 2026-06-17 12:00 |
07:58:27.23 |
+26:43:40.6 |
HIP 38985 |
42.35 |
| 2026-06-18 00:00 |
07:58:54.40 |
+26:42:12.0 |
HIP 38985 |
40.93 |
| 2026-06-18 12:00 |
07:59:21.64 |
+26:40:43.2 |
HIP 39306 |
37.94 |
| 2026-06-19 00:00 |
07:59:48.92 |
+26:39:14.1 |
HIP 39306 |
31.78 |
| 2026-06-19 12:00 |
08:00:16.26 |
+26:37:44.9 |
HIP 39306 |
25.67 |
| 2026-06-20 00:00 |
08:00:43.65 |
+26:36:15.3 |
HIP 39306 |
19.65 |
| 2026-06-20 12:00 |
08:01:11.08 |
+26:34:45.5 |
HIP 39306 |
13.87 |
| 2026-06-21 00:00 |
08:01:38.57 |
+26:33:15.5 |
HIP 39306 |
8.83 |
| 2026-06-21 12:00 |
08:02:06.11 |
+26:31:45.3 |
HIP 39306 |
6.62 |
| 2026-06-22 00:00 |
08:02:33.69 |
+26:30:14.8 |
HIP 39306 |
9.49 |