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) |
| 2026-09-20 00:00 |
02:15:25.96 |
+34:39:41.7 |
HIP 10432 |
17.59 |
| 2026-09-20 12:00 |
02:15:21.68 |
+34:39:37.8 |
HIP 10432 |
16.91 |
| 2026-09-21 00:00 |
02:15:17.38 |
+34:39:33.6 |
HIP 10432 |
16.25 |
| 2026-09-21 12:00 |
02:15:13.04 |
+34:39:29.1 |
HIP 10432 |
15.60 |
| 2026-09-22 00:00 |
02:15:08.68 |
+34:39:24.4 |
HIP 10432 |
14.97 |
| 2026-09-22 12:00 |
02:15:04.28 |
+34:39:19.4 |
HIP 10432 |
14.36 |
| 2026-09-23 00:00 |
02:14:59.86 |
+34:39:14.1 |
HIP 10432 |
13.78 |
| 2026-09-23 12:00 |
02:14:55.42 |
+34:39:08.5 |
HIP 10432 |
13.22 |
| 2026-09-24 00:00 |
02:14:50.94 |
+34:39:02.6 |
HIP 10432 |
12.71 |
| 2026-09-24 12:00 |
02:14:46.44 |
+34:38:56.4 |
HIP 10432 |
12.23 |
| 2026-09-25 00:00 |
02:14:41.92 |
+34:38:50.0 |
HIP 10432 |
11.81 |
| 2026-09-25 12:00 |
02:14:37.37 |
+34:38:43.2 |
HIP 10400 |
11.16 |
| 2026-09-26 00:00 |
02:14:32.79 |
+34:38:36.2 |
HIP 10400 |
10.43 |
| 2026-09-26 12:00 |
02:14:28.19 |
+34:38:28.9 |
HIP 10400 |
9.73 |
| 2026-09-27 00:00 |
02:14:23.56 |
+34:38:21.3 |
HIP 10400 |
9.06 |
| 2026-09-27 12:00 |
02:14:18.91 |
+34:38:13.5 |
HIP 10400 |
8.45 |
| 2026-09-28 00:00 |
02:14:14.24 |
+34:38:05.3 |
HIP 10400 |
7.90 |
| 2026-09-28 12:00 |
02:14:09.54 |
+34:37:56.9 |
HIP 10400 |
7.43 |
| 2026-09-29 00:00 |
02:14:04.81 |
+34:37:48.1 |
HIP 10400 |
7.06 |
| 2026-09-29 12:00 |
02:14:00.07 |
+34:37:39.1 |
HIP 10400 |
6.80 |
| 2026-09-30 00:00 |
02:13:55.30 |
+34:37:29.8 |
HIP 10400 |
6.68 |
| 2026-09-30 12:00 |
02:13:50.51 |
+34:37:20.2 |
HIP 10400 |
6.71 |
| 2026-10-01 00:00 |
02:13:45.70 |
+34:37:10.4 |
HIP 10400 |
6.88 |
| 2026-10-01 12:00 |
02:13:40.86 |
+34:37:00.2 |
HIP 10400 |
7.18 |
| 2026-10-02 00:00 |
02:13:36.01 |
+34:36:49.8 |
HIP 10400 |
7.61 |
| 2026-10-02 12:00 |
02:13:31.13 |
+34:36:39.1 |
HIP 10400 |
8.14 |
| 2026-10-03 00:00 |
02:13:26.23 |
+34:36:28.0 |
HIP 10400 |
8.76 |
| 2026-10-03 12:00 |
02:13:21.31 |
+34:36:16.8 |
HIP 10400 |
9.45 |
| 2026-10-04 00:00 |
02:13:16.37 |
+34:36:05.2 |
HIP 10400 |
10.20 |
| 2026-10-04 12:00 |
02:13:11.42 |
+34:35:53.3 |
HIP 10400 |
10.99 |
| 2026-10-05 00:00 |
02:13:06.44 |
+34:35:41.2 |
HIP 10400 |
11.83 |
| 2026-10-05 12:00 |
02:13:01.44 |
+34:35:28.8 |
HIP 10400 |
12.70 |
| 2026-10-06 00:00 |
02:12:56.43 |
+34:35:16.0 |
HIP 10400 |
13.60 |
| 2026-10-06 12:00 |
02:12:51.39 |
+34:35:03.1 |
HIP 10400 |
14.52 |
| 2026-10-07 00:00 |
02:12:46.34 |
+34:34:49.8 |
HIP 10400 |
15.46 |
| 2026-10-07 12:00 |
02:12:41.28 |
+34:34:36.2 |
HIP 10400 |
16.42 |
| 2026-10-08 00:00 |
02:12:36.19 |
+34:34:22.4 |
HIP 10400 |
17.39 |
| 2026-10-08 12:00 |
02:12:31.09 |
+34:34:08.3 |
HIP 10400 |
18.38 |
| 2026-10-09 00:00 |
02:12:25.97 |
+34:33:53.9 |
HIP 10400 |
19.37 |
| 2026-10-09 12:00 |
02:12:20.84 |
+34:33:39.2 |
HIP 10400 |
20.38 |
| 2026-10-10 00:00 |
02:12:15.69 |
+34:33:24.3 |
HIP 10400 |
21.40 |
| 2026-10-10 12:00 |
02:12:10.53 |
+34:33:09.0 |
HIP 10400 |
22.43 |
| 2026-10-11 00:00 |
02:12:05.36 |
+34:32:53.5 |
HIP 10400 |
23.47 |