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) |
| 2026-06-01 00:00 |
23:26:48.82 |
-10:14:23.1 |
HIP 115712 |
12.72 |
| 2026-06-01 12:00 |
23:27:01.20 |
-10:13:44.0 |
HIP 115712 |
13.20 |
| 2026-06-02 00:00 |
23:27:13.44 |
-10:13:06.1 |
HIP 115712 |
14.35 |
| 2026-06-02 12:00 |
23:27:25.53 |
-10:12:29.3 |
HIP 115712 |
16.00 |
| 2026-06-03 00:00 |
23:27:37.47 |
-10:11:53.5 |
HIP 115712 |
17.99 |
| 2026-06-03 12:00 |
23:27:49.25 |
-10:11:18.9 |
HIP 115712 |
20.21 |
| 2026-06-04 00:00 |
23:28:00.89 |
-10:10:45.4 |
HIP 115712 |
22.57 |
| 2026-06-04 12:00 |
23:28:12.37 |
-10:10:13.0 |
HIP 115712 |
25.02 |
| 2026-06-05 00:00 |
23:28:23.69 |
-10:09:41.6 |
HIP 115712 |
27.52 |
| 2026-06-05 12:00 |
23:28:34.87 |
-10:09:11.5 |
HIP 115712 |
30.05 |
| 2026-06-06 00:00 |
23:28:45.88 |
-10:08:42.4 |
HIP 116006 |
28.49 |
| 2026-06-06 12:00 |
23:28:56.74 |
-10:08:14.5 |
HIP 116006 |
26.82 |
| 2026-06-07 00:00 |
23:29:07.44 |
-10:07:47.7 |
HIP 116006 |
25.35 |
| 2026-06-07 12:00 |
23:29:17.98 |
-10:07:22.0 |
HIP 116048 |
23.08 |
| 2026-06-08 00:00 |
23:29:28.36 |
-10:06:57.5 |
HIP 116048 |
20.58 |
| 2026-06-08 12:00 |
23:29:38.58 |
-10:06:34.2 |
HIP 116048 |
18.14 |
| 2026-06-09 00:00 |
23:29:48.64 |
-10:06:12.0 |
HIP 116048 |
15.77 |
| 2026-06-09 12:00 |
23:29:58.54 |
-10:05:50.9 |
HIP 116048 |
13.48 |
| 2026-06-10 00:00 |
23:30:08.28 |
-10:05:31.1 |
HIP 116048 |
11.29 |
| 2026-06-10 12:00 |
23:30:17.85 |
-10:05:12.4 |
HIP 116048 |
9.24 |
| 2026-06-11 00:00 |
23:30:27.25 |
-10:04:54.9 |
HIP 116048 |
7.42 |
| 2026-06-11 12:00 |
23:30:36.49 |
-10:04:38.5 |
HIP 116048 |
5.97 |
| 2026-06-12 00:00 |
23:30:45.56 |
-10:04:23.4 |
HIP 116048 |
5.16 |
| 2026-06-12 12:00 |
23:30:54.46 |
-10:04:09.4 |
HIP 116048 |
5.24 |
| 2026-06-13 00:00 |
23:31:03.20 |
-10:03:56.6 |
HIP 116048 |
6.13 |
| 2026-06-13 12:00 |
23:31:11.76 |
-10:03:45.1 |
HIP 116048 |
7.51 |
| 2026-06-14 00:00 |
23:31:20.15 |
-10:03:34.7 |
HIP 116048 |
9.12 |
| 2026-06-14 12:00 |
23:31:28.38 |
-10:03:25.5 |
HIP 116048 |
10.85 |
| 2026-06-15 00:00 |
23:31:36.42 |
-10:03:17.6 |
HIP 116048 |
12.62 |
| 2026-06-15 12:00 |
23:31:44.30 |
-10:03:10.9 |
HIP 116048 |
14.40 |
| 2026-06-16 00:00 |
23:31:52.00 |
-10:03:05.3 |
HIP 116048 |
16.17 |
| 2026-06-16 12:00 |
23:31:59.53 |
-10:03:01.0 |
HIP 116048 |
17.91 |
| 2026-06-17 00:00 |
23:32:06.88 |
-10:02:58.0 |
HIP 116048 |
19.63 |
| 2026-06-17 12:00 |
23:32:14.06 |
-10:02:56.1 |
HIP 116048 |
21.32 |
| 2026-06-18 00:00 |
23:32:21.05 |
-10:02:55.5 |
HIP 116048 |
22.97 |
| 2026-06-18 12:00 |
23:32:27.87 |
-10:02:56.0 |
HIP 116048 |
24.59 |
| 2026-06-19 00:00 |
23:32:34.52 |
-10:02:57.9 |
HIP 116048 |
26.16 |
| 2026-06-19 12:00 |
23:32:40.98 |
-10:03:00.9 |
HIP 116048 |
27.70 |
| 2026-06-20 00:00 |
23:32:47.26 |
-10:03:05.2 |
HIP 116048 |
29.19 |
| 2026-06-20 12:00 |
23:32:53.37 |
-10:03:10.7 |
HIP 116329 |
29.54 |
| 2026-06-21 00:00 |
23:32:59.29 |
-10:03:17.4 |
HIP 116329 |
28.60 |
| 2026-06-21 12:00 |
23:33:05.03 |
-10:03:25.4 |
HIP 116329 |
27.74 |
| 2026-06-22 00:00 |
23:33:10.59 |
-10:03:34.6 |
HIP 116329 |
26.98 |