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) |
| 2026-05-12 00:00 |
07:28:49.43 |
+28:20:15.1 |
HIP 36393 |
14.82 |
| 2026-05-12 12:00 |
07:29:10.20 |
+28:19:04.4 |
HIP 36393 |
12.18 |
| 2026-05-13 00:00 |
07:29:31.09 |
+28:17:53.5 |
HIP 36393 |
11.04 |
| 2026-05-13 12:00 |
07:29:52.10 |
+28:16:42.4 |
HIP 36393 |
11.87 |
| 2026-05-14 00:00 |
07:30:13.24 |
+28:15:31.0 |
HIP 36393 |
14.35 |
| 2026-05-14 12:00 |
07:30:34.50 |
+28:14:19.4 |
HIP 36393 |
17.84 |
| 2026-05-15 00:00 |
07:30:55.88 |
+28:13:07.5 |
HIP 36509 |
18.94 |
| 2026-05-15 12:00 |
07:31:17.38 |
+28:11:55.5 |
HIP 36509 |
19.29 |
| 2026-05-16 00:00 |
07:31:39.00 |
+28:10:43.1 |
HIP 36509 |
20.83 |
| 2026-05-16 12:00 |
07:32:00.74 |
+28:09:30.6 |
HIP 36509 |
23.34 |
| 2026-05-17 00:00 |
07:32:22.59 |
+28:08:17.8 |
HIP 36509 |
26.57 |
| 2026-05-17 12:00 |
07:32:44.56 |
+28:07:04.7 |
HIP 36835 |
28.81 |
| 2026-05-18 00:00 |
07:33:06.65 |
+28:05:51.4 |
HIP 36835 |
26.00 |
| 2026-05-18 12:00 |
07:33:28.84 |
+28:04:37.9 |
HIP 36835 |
23.91 |
| 2026-05-19 00:00 |
07:33:51.15 |
+28:03:24.2 |
HIP 36835 |
22.76 |
| 2026-05-19 12:00 |
07:34:13.57 |
+28:02:10.2 |
HIP 36835 |
22.71 |
| 2026-05-20 00:00 |
07:34:36.10 |
+28:00:55.9 |
HIP 36835 |
23.77 |
| 2026-05-20 12:00 |
07:34:58.73 |
+27:59:41.5 |
HIP 36835 |
25.84 |
| 2026-05-21 00:00 |
07:35:21.48 |
+27:58:26.7 |
HIP 36835 |
28.70 |
| 2026-05-21 12:00 |
07:35:44.33 |
+27:57:11.8 |
HIP 37131 |
29.97 |
| 2026-05-22 00:00 |
07:36:07.28 |
+27:55:56.6 |
HIP 37131 |
24.87 |
| 2026-05-22 12:00 |
07:36:30.33 |
+27:54:41.2 |
HIP 37131 |
19.82 |
| 2026-05-23 00:00 |
07:36:53.49 |
+27:53:25.5 |
HIP 37131 |
14.88 |
| 2026-05-23 12:00 |
07:37:16.75 |
+27:52:09.6 |
HIP 37131 |
10.26 |
| 2026-05-24 00:00 |
07:37:40.11 |
+27:50:53.5 |
HIP 37131 |
6.71 |
| 2026-05-24 12:00 |
07:38:03.57 |
+27:49:37.1 |
HIP 37131 |
6.44 |
| 2026-05-25 00:00 |
07:38:27.12 |
+27:48:20.5 |
HIP 37131 |
9.77 |
| 2026-05-25 12:00 |
07:38:50.77 |
+27:47:03.6 |
HIP 37131 |
14.41 |
| 2026-05-26 00:00 |
07:39:14.52 |
+27:45:46.5 |
HIP 37131 |
19.46 |
| 2026-05-26 12:00 |
07:39:38.36 |
+27:44:29.1 |
HIP 37407 |
19.97 |
| 2026-05-27 00:00 |
07:40:02.29 |
+27:43:11.6 |
HIP 37407 |
17.12 |
| 2026-05-27 12:00 |
07:40:26.32 |
+27:41:53.7 |
HIP 37407 |
15.71 |
| 2026-05-28 00:00 |
07:40:50.44 |
+27:40:35.7 |
HIP 37407 |
16.13 |
| 2026-05-28 12:00 |
07:41:14.65 |
+27:39:17.3 |
HIP 37407 |
18.28 |
| 2026-05-29 00:00 |
07:41:38.95 |
+27:37:58.8 |
HIP 37407 |
21.67 |
| 2026-05-29 12:00 |
07:42:03.33 |
+27:36:40.0 |
HIP 37407 |
25.83 |
| 2026-05-30 00:00 |
07:42:27.81 |
+27:35:20.9 |
HIP 37407 |
30.45 |
| 2026-05-30 12:00 |
07:42:52.37 |
+27:34:01.6 |
HIP 37407 |
35.37 |
| 2026-05-31 00:00 |
07:43:17.02 |
+27:32:42.1 |
HIP 37826 |
39.57 |
| 2026-05-31 12:00 |
07:43:41.75 |
+27:31:22.3 |
HIP 37826 |
37.13 |
| 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 |