メタデータ
| 項目 |
値 |
| Designation |
C/2013 U2 (Holvorcem) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-10-25T20:53:27.847680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:42Z |
| Obs used |
471 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
11.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-11-05.0000000 |
| e |
0.99429888 |
| q (au) |
5.116737 |
| a (au) |
897.497310 |
| i (deg) |
43.094095 |
| Ω (om, deg) |
7.001119 |
| ω (w, deg) |
107.375509 |
| M (ma, deg) |
0.000371 |
等級
散乱 + 全体線形
$$
M_a = (2.650 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.650 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.503 |
| k |
1.000 |
| 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 |
| 2013-10-23 |
2014-10-24 |
+10.6160 |
-7.950 |
| 2014-11-29 |
2016-03-11 |
+5.6262 |
-4.008 |
| 2016-03-11 |
2017-03-27 |
+0.3891 |
-0.346 |
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 |
14:19:15.54 |
-49:16:30.9 |
HIP 70124 |
17.14 |
| 2026-09-20 12:00 |
14:19:21.32 |
-49:16:27.3 |
HIP 70124 |
16.27 |
| 2026-09-21 00:00 |
14:19:27.13 |
-49:16:24.0 |
HIP 70124 |
15.40 |
| 2026-09-21 12:00 |
14:19:32.98 |
-49:16:21.1 |
HIP 70124 |
14.54 |
| 2026-09-22 00:00 |
14:19:38.85 |
-49:16:18.5 |
HIP 70124 |
13.68 |
| 2026-09-22 12:00 |
14:19:44.76 |
-49:16:16.2 |
HIP 70124 |
12.83 |
| 2026-09-23 00:00 |
14:19:50.70 |
-49:16:14.4 |
HIP 70124 |
11.98 |
| 2026-09-23 12:00 |
14:19:56.67 |
-49:16:12.8 |
HIP 70124 |
11.15 |
| 2026-09-24 00:00 |
14:20:02.67 |
-49:16:11.6 |
HIP 70124 |
10.34 |
| 2026-09-24 12:00 |
14:20:08.70 |
-49:16:10.8 |
HIP 70124 |
9.55 |
| 2026-09-25 00:00 |
14:20:14.77 |
-49:16:10.3 |
HIP 70124 |
8.80 |
| 2026-09-25 12:00 |
14:20:20.86 |
-49:16:10.2 |
HIP 70124 |
8.08 |
| 2026-09-26 00:00 |
14:20:26.98 |
-49:16:10.4 |
HIP 70124 |
7.42 |
| 2026-09-26 12:00 |
14:20:33.13 |
-49:16:11.0 |
HIP 70124 |
6.84 |
| 2026-09-27 00:00 |
14:20:39.31 |
-49:16:11.9 |
HIP 70124 |
6.35 |
| 2026-09-27 12:00 |
14:20:45.51 |
-49:16:13.1 |
HIP 70124 |
5.99 |
| 2026-09-28 00:00 |
14:20:51.75 |
-49:16:14.7 |
HIP 70124 |
5.78 |
| 2026-09-28 12:00 |
14:20:58.01 |
-49:16:16.7 |
HIP 70124 |
5.74 |
| 2026-09-29 00:00 |
14:21:04.30 |
-49:16:19.0 |
HIP 70124 |
5.87 |
| 2026-09-29 12:00 |
14:21:10.62 |
-49:16:21.7 |
HIP 70124 |
6.17 |
| 2026-09-30 00:00 |
14:21:16.97 |
-49:16:24.7 |
HIP 70124 |
6.62 |
| 2026-09-30 12:00 |
14:21:23.34 |
-49:16:28.0 |
HIP 70124 |
7.19 |
| 2026-10-01 00:00 |
14:21:29.74 |
-49:16:31.7 |
HIP 70124 |
7.85 |
| 2026-10-01 12:00 |
14:21:36.16 |
-49:16:35.8 |
HIP 70124 |
8.59 |
| 2026-10-02 00:00 |
14:21:42.61 |
-49:16:40.2 |
HIP 70124 |
9.39 |
| 2026-10-02 12:00 |
14:21:49.08 |
-49:16:44.9 |
HIP 70124 |
10.23 |
| 2026-10-03 00:00 |
14:21:55.58 |
-49:16:50.1 |
HIP 70124 |
11.11 |
| 2026-10-03 12:00 |
14:22:02.11 |
-49:16:55.5 |
HIP 70124 |
12.03 |
| 2026-10-04 00:00 |
14:22:08.65 |
-49:17:01.3 |
HIP 70124 |
12.96 |
| 2026-10-04 12:00 |
14:22:15.23 |
-49:17:07.5 |
HIP 70124 |
13.92 |
| 2026-10-05 00:00 |
14:22:21.82 |
-49:17:14.0 |
HIP 70124 |
14.90 |
| 2026-10-05 12:00 |
14:22:28.44 |
-49:17:20.8 |
HIP 70194 |
15.53 |
| 2026-10-06 00:00 |
14:22:35.08 |
-49:17:28.0 |
HIP 70194 |
16.18 |
| 2026-10-06 12:00 |
14:22:41.74 |
-49:17:35.6 |
HIP 70194 |
16.88 |
| 2026-10-07 00:00 |
14:22:48.43 |
-49:17:43.5 |
HIP 70194 |
17.63 |
| 2026-10-07 12:00 |
14:22:55.14 |
-49:17:51.7 |
HIP 70194 |
18.42 |
| 2026-10-08 00:00 |
14:23:01.86 |
-49:18:00.3 |
HIP 70194 |
19.24 |
| 2026-10-08 12:00 |
14:23:08.61 |
-49:18:09.3 |
HIP 70194 |
20.10 |
| 2026-10-09 00:00 |
14:23:15.38 |
-49:18:18.6 |
HIP 70194 |
21.00 |
| 2026-10-09 12:00 |
14:23:22.17 |
-49:18:28.2 |
HIP 70427 |
20.95 |
| 2026-10-10 00:00 |
14:23:28.98 |
-49:18:38.2 |
HIP 70427 |
20.56 |
| 2026-10-10 12:00 |
14:23:35.81 |
-49:18:48.6 |
HIP 70427 |
20.22 |
| 2026-10-11 00:00 |
14:23:42.66 |
-49:18:59.2 |
HIP 70427 |
19.94 |