メタデータ
| 項目 |
値 |
| Designation |
C/2013 US10 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-11-15T17:19:09.851520Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T14:42:53Z |
| Obs used |
4397 |
| NEO |
- |
| M1 |
8.500 |
| K1 |
6.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-11-23.0000000 |
| e |
1.00028014 |
| q (au) |
0.822969 |
| a (au) |
-2937.712795 |
| i (deg) |
148.878297 |
| Ω (om, deg) |
186.144580 |
| ω (w, deg) |
340.358754 |
| M (ma, deg) |
0.000045 |
等級
散乱 + 全体線形
$$
M_a = (5.879 + 3.465\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.879 |
| n |
3.465 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2013-11-16 |
2014-09-02 |
+6.3490 |
-5.168 |
| 2014-09-02 |
2015-05-09 |
-1.8469 |
+1.075 |
| 2015-05-09 |
2015-07-22 |
+1.9657 |
-0.856 |
| 2015-07-22 |
2015-09-04 |
+7.2007 |
-2.686 |
| 2015-09-04 |
2015-10-16 |
-7.7697 |
+0.128 |
| 2015-11-22 |
2016-09-01 |
+1.0099 |
+0.081 |
| 2016-09-01 |
2017-10-24 |
-1.4000 |
+1.815 |
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) |
| 2026-07-29 00:00 |
02:19:30.85 |
+34:22:26.6 |
HIP 10774 |
12.57 |
| 2026-07-29 12:00 |
02:19:30.70 |
+34:22:47.4 |
HIP 10774 |
12.36 |
| 2026-07-30 00:00 |
02:19:30.52 |
+34:23:08.1 |
HIP 10774 |
12.15 |
| 2026-07-30 12:00 |
02:19:30.29 |
+34:23:28.6 |
HIP 10774 |
11.94 |
| 2026-07-31 00:00 |
02:19:30.01 |
+34:23:49.0 |
HIP 10774 |
11.73 |
| 2026-07-31 12:00 |
02:19:29.70 |
+34:24:09.2 |
HIP 10774 |
11.52 |
| 2026-08-01 00:00 |
02:19:29.34 |
+34:24:29.2 |
HIP 10774 |
11.30 |
| 2026-08-01 12:00 |
02:19:28.94 |
+34:24:49.1 |
HIP 10774 |
11.09 |
| 2026-08-02 00:00 |
02:19:28.50 |
+34:25:08.8 |
HIP 10774 |
10.88 |
| 2026-08-02 12:00 |
02:19:28.01 |
+34:25:28.3 |
HIP 10774 |
10.67 |
| 2026-08-03 00:00 |
02:19:27.49 |
+34:25:47.6 |
HIP 10774 |
10.45 |
| 2026-08-03 12:00 |
02:19:26.92 |
+34:26:06.8 |
HIP 10774 |
10.24 |
| 2026-08-04 00:00 |
02:19:26.30 |
+34:26:25.8 |
HIP 10774 |
10.02 |
| 2026-08-04 12:00 |
02:19:25.65 |
+34:26:44.7 |
HIP 10774 |
9.81 |
| 2026-08-05 00:00 |
02:19:24.95 |
+34:27:03.4 |
HIP 10774 |
9.59 |
| 2026-08-05 12:00 |
02:19:24.21 |
+34:27:21.8 |
HIP 10774 |
9.38 |
| 2026-08-06 00:00 |
02:19:23.42 |
+34:27:40.1 |
HIP 10774 |
9.16 |
| 2026-08-06 12:00 |
02:19:22.60 |
+34:27:58.3 |
HIP 10774 |
8.94 |
| 2026-08-07 00:00 |
02:19:21.73 |
+34:28:16.2 |
HIP 10774 |
8.73 |
| 2026-08-07 12:00 |
02:19:20.81 |
+34:28:34.0 |
HIP 10774 |
8.51 |
| 2026-08-08 00:00 |
02:19:19.86 |
+34:28:51.5 |
HIP 10774 |
8.29 |
| 2026-08-08 12:00 |
02:19:18.86 |
+34:29:08.9 |
HIP 10774 |
8.08 |
| 2026-08-09 00:00 |
02:19:17.82 |
+34:29:26.1 |
HIP 10774 |
7.86 |
| 2026-08-09 12:00 |
02:19:16.73 |
+34:29:43.1 |
HIP 10774 |
7.65 |
| 2026-08-10 00:00 |
02:19:15.60 |
+34:29:59.9 |
HIP 10774 |
7.44 |
| 2026-08-10 12:00 |
02:19:14.43 |
+34:30:16.5 |
HIP 10774 |
7.23 |
| 2026-08-11 00:00 |
02:19:13.22 |
+34:30:32.9 |
HIP 10774 |
7.03 |
| 2026-08-11 12:00 |
02:19:11.96 |
+34:30:49.1 |
HIP 10774 |
6.83 |
| 2026-08-12 00:00 |
02:19:10.66 |
+34:31:05.1 |
HIP 10774 |
6.64 |
| 2026-08-12 12:00 |
02:19:09.32 |
+34:31:20.9 |
HIP 10774 |
6.45 |
| 2026-08-13 00:00 |
02:19:07.93 |
+34:31:36.5 |
HIP 10774 |
6.28 |
| 2026-08-13 12:00 |
02:19:06.51 |
+34:31:51.9 |
HIP 10774 |
6.11 |
| 2026-08-14 00:00 |
02:19:05.03 |
+34:32:07.1 |
HIP 10774 |
5.95 |
| 2026-08-14 12:00 |
02:19:03.52 |
+34:32:22.0 |
HIP 10774 |
5.81 |
| 2026-08-15 00:00 |
02:19:01.96 |
+34:32:36.8 |
HIP 10774 |
5.68 |
| 2026-08-15 12:00 |
02:19:00.36 |
+34:32:51.3 |
HIP 10774 |
5.57 |
| 2026-08-16 00:00 |
02:18:58.72 |
+34:33:05.7 |
HIP 10774 |
5.48 |
| 2026-08-16 12:00 |
02:18:57.04 |
+34:33:19.8 |
HIP 10774 |
5.41 |
| 2026-08-17 00:00 |
02:18:55.31 |
+34:33:33.7 |
HIP 10774 |
5.37 |
| 2026-08-17 12:00 |
02:18:53.54 |
+34:33:47.4 |
HIP 10774 |
5.35 |
| 2026-08-18 00:00 |
02:18:51.73 |
+34:34:00.8 |
HIP 10774 |
5.36 |
| 2026-08-18 12:00 |
02:18:49.88 |
+34:34:14.1 |
HIP 10774 |
5.39 |
| 2026-08-19 00:00 |
02:18:47.98 |
+34:34:27.1 |
HIP 10774 |
5.46 |