メタデータ
| 項目 |
値 |
| Designation |
94P/Russell 4 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-10-27T19:16:55.781760Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T14:12:55Z |
| Obs used |
2196 |
| 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) |
2014-04-27.0000000 |
| e |
0.36413508 |
| q (au) |
2.232672 |
| a (au) |
3.511237 |
| i (deg) |
6.184190 |
| Ω (om, deg) |
70.900383 |
| ω (w, deg) |
92.686026 |
| M (ma, deg) |
222.961807 |
等級
散乱 + 全体線形
$$
M_a = (12.171 + 4.127\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.171 |
| n |
4.127 |
| gf |
1.000 |
| gb |
-0.872 |
| 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 |
| 2020-09-12 |
2022-11-21 |
+13.1879 |
-4.863 |
| 2022-11-21 |
2023-05-28 |
-4.7545 |
+2.518 |
| 2023-05-28 |
2025-08-16 |
+3.6569 |
-2.522 |
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) |
| 2026-03-26 00:00 |
22:41:51.37 |
-13:49:19.2 |
HIP 111979 |
13.51 |
| 2026-03-26 12:00 |
22:42:17.03 |
-13:47:03.0 |
HIP 111979 |
20.06 |
| 2026-03-27 00:00 |
22:42:42.64 |
-13:44:47.1 |
HIP 111979 |
26.63 |
| 2026-03-27 12:00 |
22:43:08.19 |
-13:42:31.7 |
HIP 111979 |
33.21 |
| 2026-03-28 00:00 |
22:43:33.68 |
-13:40:16.6 |
HIP 112412 |
38.43 |
| 2026-03-28 12:00 |
22:43:59.12 |
-13:38:01.9 |
HIP 112412 |
33.25 |
| 2026-03-29 00:00 |
22:44:24.50 |
-13:35:47.6 |
HIP 112412 |
28.66 |
| 2026-03-29 12:00 |
22:44:49.82 |
-13:33:33.7 |
HIP 112412 |
24.97 |
| 2026-03-30 00:00 |
22:45:15.08 |
-13:31:20.2 |
HIP 112412 |
22.61 |
| 2026-03-30 12:00 |
22:45:40.28 |
-13:29:07.0 |
HIP 112412 |
21.99 |
| 2026-03-31 00:00 |
22:46:05.42 |
-13:26:54.3 |
HIP 112412 |
23.26 |
| 2026-03-31 12:00 |
22:46:30.50 |
-13:24:42.0 |
HIP 112412 |
26.12 |
| 2026-04-01 00:00 |
22:46:55.52 |
-13:22:30.1 |
HIP 112412 |
30.11 |
| 2026-04-01 12:00 |
22:47:20.47 |
-13:20:18.6 |
HIP 112352 |
34.03 |
| 2026-04-02 00:00 |
22:47:45.37 |
-13:18:07.6 |
HIP 112716 |
31.95 |
| 2026-04-02 12:00 |
22:48:10.20 |
-13:15:56.9 |
HIP 112716 |
28.54 |
| 2026-04-03 00:00 |
22:48:34.97 |
-13:13:46.8 |
HIP 112716 |
26.28 |
| 2026-04-03 12:00 |
22:48:59.68 |
-13:11:37.0 |
HIP 112790 |
22.70 |
| 2026-04-04 00:00 |
22:49:24.32 |
-13:09:27.7 |
HIP 112790 |
18.11 |
| 2026-04-04 12:00 |
22:49:48.90 |
-13:07:18.8 |
HIP 112790 |
14.91 |
| 2026-04-05 00:00 |
22:50:13.41 |
-13:05:10.4 |
HIP 112790 |
14.04 |
| 2026-04-05 12:00 |
22:50:37.85 |
-13:03:02.4 |
HIP 112790 |
15.87 |
| 2026-04-06 00:00 |
22:51:02.23 |
-13:00:54.9 |
HIP 112790 |
19.65 |
| 2026-04-06 12:00 |
22:51:26.55 |
-12:58:47.9 |
HIP 112980 |
21.38 |
| 2026-04-07 00:00 |
22:51:50.79 |
-12:56:41.3 |
HIP 112980 |
16.99 |
| 2026-04-07 12:00 |
22:52:14.97 |
-12:54:35.2 |
HIP 112980 |
14.12 |
| 2026-04-08 00:00 |
22:52:39.08 |
-12:52:29.6 |
HIP 112980 |
13.71 |
| 2026-04-08 12:00 |
22:53:03.11 |
-12:50:24.5 |
HIP 112980 |
15.93 |
| 2026-04-09 00:00 |
22:53:27.08 |
-12:48:19.9 |
HIP 112980 |
19.91 |
| 2026-04-09 12:00 |
22:53:50.98 |
-12:46:15.8 |
HIP 112980 |
24.80 |
| 2026-04-10 00:00 |
22:54:14.81 |
-12:44:12.2 |
HIP 113250 |
28.67 |
| 2026-04-10 12:00 |
22:54:38.56 |
-12:42:09.1 |
HIP 113250 |
24.96 |
| 2026-04-11 00:00 |
22:55:02.24 |
-12:40:06.5 |
HIP 113250 |
22.35 |
| 2026-04-11 12:00 |
22:55:25.85 |
-12:38:04.4 |
HIP 113264 |
17.55 |
| 2026-04-12 00:00 |
22:55:49.39 |
-12:36:02.9 |
HIP 113264 |
12.89 |
| 2026-04-12 12:00 |
22:56:12.85 |
-12:34:01.9 |
HIP 113264 |
9.93 |
| 2026-04-13 00:00 |
22:56:36.23 |
-12:32:01.4 |
HIP 113264 |
10.23 |
| 2026-04-13 12:00 |
22:56:59.54 |
-12:30:01.5 |
HIP 113264 |
13.55 |
| 2026-04-14 00:00 |
22:57:22.77 |
-12:28:02.2 |
HIP 113264 |
18.30 |
| 2026-04-14 12:00 |
22:57:45.93 |
-12:26:03.4 |
HIP 113264 |
23.61 |
| 2026-04-15 00:00 |
22:58:09.00 |
-12:24:05.2 |
HIP 113264 |
29.17 |
| 2026-04-15 12:00 |
22:58:32.00 |
-12:22:07.6 |
HIP 113529 |
27.95 |
| 2026-04-16 00:00 |
22:58:54.92 |
-12:20:10.5 |
HIP 113529 |
27.18 |