メタデータ
| 項目 |
値 |
| Designation |
94P/Russell 4 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-10-27T19:11:10.328640Z |
| Orbit solution date (soln_date, UTC) |
2026-05-06T14:49:56Z |
| Obs used |
2200 |
| NEO |
- |
| M1 |
13.400 |
| K1 |
9.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-05-04.0000000 |
| e |
0.36414156 |
| q (au) |
2.232637 |
| a (au) |
3.511217 |
| i (deg) |
6.184203 |
| Ω (om, deg) |
70.900127 |
| ω (w, deg) |
92.686863 |
| M (ma, deg) |
224.009846 |
等級
散乱 + 全体線形
$$
M_a = (12.248 + 4.046\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.248 |
| n |
4.046 |
| gf |
1.000 |
| gb |
-0.865 |
| k |
0.999 |
| 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 |
| 2020-09-12 |
2022-11-21 |
+13.3931 |
-4.938 |
| 2022-11-21 |
2023-05-28 |
-4.6753 |
+2.495 |
| 2023-05-28 |
2025-08-16 |
+3.5900 |
-2.457 |
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 |
23:31:04.15 |
-11:11:10.0 |
HIP 116143 |
17.20 |
| 2026-07-29 12:00 |
23:30:55.03 |
-11:12:46.5 |
HIP 116143 |
19.94 |
| 2026-07-30 00:00 |
23:30:45.72 |
-11:14:23.8 |
HIP 116143 |
22.73 |
| 2026-07-30 12:00 |
23:30:36.22 |
-11:16:02.1 |
HIP 116143 |
25.56 |
| 2026-07-31 00:00 |
23:30:26.54 |
-11:17:41.2 |
HIP 116143 |
28.45 |
| 2026-07-31 12:00 |
23:30:16.67 |
-11:19:21.2 |
HIP 116143 |
31.37 |
| 2026-08-01 00:00 |
23:30:06.61 |
-11:21:02.0 |
HIP 115839 |
30.36 |
| 2026-08-01 12:00 |
23:29:56.37 |
-11:22:43.7 |
HIP 115839 |
27.59 |
| 2026-08-02 00:00 |
23:29:45.94 |
-11:24:26.2 |
HIP 115839 |
24.83 |
| 2026-08-02 12:00 |
23:29:35.33 |
-11:26:09.5 |
HIP 115839 |
22.12 |
| 2026-08-03 00:00 |
23:29:24.54 |
-11:27:53.6 |
HIP 115839 |
19.48 |
| 2026-08-03 12:00 |
23:29:13.57 |
-11:29:38.5 |
HIP 115839 |
16.98 |
| 2026-08-04 00:00 |
23:29:02.42 |
-11:31:24.2 |
HIP 115839 |
14.71 |
| 2026-08-04 12:00 |
23:28:51.09 |
-11:33:10.6 |
HIP 115839 |
12.85 |
| 2026-08-05 00:00 |
23:28:39.58 |
-11:34:57.8 |
HIP 115839 |
11.61 |
| 2026-08-05 12:00 |
23:28:27.89 |
-11:36:45.7 |
HIP 115839 |
11.26 |
| 2026-08-06 00:00 |
23:28:16.03 |
-11:38:34.3 |
HIP 115839 |
11.89 |
| 2026-08-06 12:00 |
23:28:03.99 |
-11:40:23.6 |
HIP 115839 |
13.41 |
| 2026-08-07 00:00 |
23:27:51.79 |
-11:42:13.6 |
HIP 115839 |
15.59 |
| 2026-08-07 12:00 |
23:27:39.41 |
-11:44:04.3 |
HIP 115839 |
18.21 |
| 2026-08-08 00:00 |
23:27:26.85 |
-11:45:55.6 |
HIP 115839 |
21.14 |
| 2026-08-08 12:00 |
23:27:14.14 |
-11:47:47.5 |
HIP 115839 |
24.27 |
| 2026-08-09 00:00 |
23:27:01.25 |
-11:49:40.1 |
HIP 115839 |
27.56 |
| 2026-08-09 12:00 |
23:26:48.20 |
-11:51:33.3 |
HIP 115844 |
28.68 |
| 2026-08-10 00:00 |
23:26:34.98 |
-11:53:27.0 |
HIP 115844 |
29.68 |
| 2026-08-10 12:00 |
23:26:21.60 |
-11:55:21.3 |
HIP 115844 |
31.14 |
| 2026-08-11 00:00 |
23:26:08.06 |
-11:57:16.1 |
HIP 115844 |
32.99 |
| 2026-08-11 12:00 |
23:25:54.37 |
-11:59:11.5 |
HIP 115629 |
33.02 |
| 2026-08-12 00:00 |
23:25:40.51 |
-12:01:07.4 |
HIP 115629 |
30.54 |
| 2026-08-12 12:00 |
23:25:26.51 |
-12:03:03.7 |
HIP 115629 |
28.38 |
| 2026-08-13 00:00 |
23:25:12.34 |
-12:05:00.6 |
HIP 115629 |
26.62 |
| 2026-08-13 12:00 |
23:24:58.03 |
-12:06:57.8 |
HIP 115629 |
25.37 |
| 2026-08-14 00:00 |
23:24:43.57 |
-12:08:55.5 |
HIP 115629 |
24.73 |
| 2026-08-14 12:00 |
23:24:28.97 |
-12:10:53.6 |
HIP 115629 |
24.74 |
| 2026-08-15 00:00 |
23:24:14.22 |
-12:12:52.0 |
HIP 115629 |
25.44 |
| 2026-08-15 12:00 |
23:23:59.32 |
-12:14:50.9 |
HIP 115629 |
26.78 |
| 2026-08-16 00:00 |
23:23:44.29 |
-12:16:50.0 |
HIP 115346 |
27.76 |
| 2026-08-16 12:00 |
23:23:29.12 |
-12:18:49.5 |
HIP 115346 |
24.20 |
| 2026-08-17 00:00 |
23:23:13.82 |
-12:20:49.3 |
HIP 115346 |
20.85 |
| 2026-08-17 12:00 |
23:22:58.38 |
-12:22:49.3 |
HIP 115351 |
16.81 |
| 2026-08-18 00:00 |
23:22:42.81 |
-12:24:49.6 |
HIP 115351 |
12.68 |
| 2026-08-18 12:00 |
23:22:27.12 |
-12:26:50.1 |
HIP 115351 |
8.67 |
| 2026-08-19 00:00 |
23:22:11.30 |
-12:28:50.9 |
HIP 115351 |
5.17 |