94P/Russell 4
メタデータ
| 項目 |
値 |
| Designation |
94P/Russell 4 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-10-27T19:27:49.345920Z |
| Orbit solution date (soln_date, UTC) |
2025-09-10T22:19:20Z |
| Obs used |
2188 |
| 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) |
2014-04-12.0000000 |
| e |
0.36412202 |
| q (au) |
2.232745 |
| a (au) |
3.511278 |
| i (deg) |
6.184161 |
| Ω (om, deg) |
70.900989 |
| ω (w, deg) |
92.684193 |
| M (ma, deg) |
220.716115 |
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) |
| 2026-02-03 00:00 |
21:55:07.25 |
-17:58:04.8 |
HIP 108214 |
16.69 |
| 2026-02-03 12:00 |
21:55:35.51 |
-17:55:36.4 |
HIP 108327 |
16.86 |
| 2026-02-04 00:00 |
21:56:03.77 |
-17:53:08.0 |
HIP 108327 |
10.07 |
| 2026-02-04 12:00 |
21:56:32.04 |
-17:50:39.4 |
HIP 108327 |
4.59 |
| 2026-02-05 00:00 |
21:57:00.32 |
-17:48:10.8 |
HIP 108327 |
6.59 |
| 2026-02-05 12:00 |
21:57:28.59 |
-17:45:42.0 |
HIP 108419 |
5.36 |
| 2026-02-06 00:00 |
21:57:56.87 |
-17:43:13.2 |
HIP 108419 |
4.18 |
| 2026-02-06 12:00 |
21:58:25.15 |
-17:40:44.3 |
HIP 108419 |
10.45 |
| 2026-02-07 00:00 |
21:58:53.44 |
-17:38:15.3 |
HIP 108419 |
17.44 |
| 2026-02-07 12:00 |
21:59:21.72 |
-17:35:46.2 |
HIP 108560 |
17.16 |
| 2026-02-08 00:00 |
21:59:50.01 |
-17:33:17.0 |
HIP 108622 |
12.23 |
| 2026-02-08 12:00 |
22:00:18.30 |
-17:30:47.8 |
HIP 108622 |
7.62 |
| 2026-02-09 00:00 |
22:00:46.58 |
-17:28:18.5 |
HIP 108711 |
8.10 |
| 2026-02-09 12:00 |
22:01:14.87 |
-17:25:49.2 |
HIP 108711 |
5.25 |
| 2026-02-10 00:00 |
22:01:43.15 |
-17:23:19.8 |
HIP 108711 |
9.64 |
| 2026-02-10 12:00 |
22:02:11.43 |
-17:20:50.3 |
HIP 108711 |
16.18 |
| 2026-02-11 00:00 |
22:02:39.71 |
-17:18:20.8 |
HIP 108797 |
20.71 |
| 2026-02-11 12:00 |
22:03:07.99 |
-17:15:51.3 |
HIP 108797 |
20.55 |
| 2026-02-12 00:00 |
22:03:36.26 |
-17:13:21.7 |
HIP 108797 |
22.79 |
| 2026-02-12 12:00 |
22:04:04.52 |
-17:10:52.1 |
HIP 108797 |
26.83 |
| 2026-02-13 00:00 |
22:04:32.78 |
-17:08:22.4 |
HIP 108797 |
32.01 |
| 2026-02-13 12:00 |
22:05:01.04 |
-17:05:52.7 |
HIP 109062 |
33.75 |
| 2026-02-14 00:00 |
22:05:29.28 |
-17:03:23.0 |
HIP 109062 |
30.16 |
| 2026-02-14 12:00 |
22:05:57.52 |
-17:00:53.3 |
HIP 109062 |
27.99 |
| 2026-02-15 00:00 |
22:06:25.75 |
-16:58:23.5 |
HIP 109062 |
27.59 |
| 2026-02-15 12:00 |
22:06:53.97 |
-16:55:53.8 |
HIP 109062 |
29.04 |
| 2026-02-16 00:00 |
22:07:22.19 |
-16:53:24.0 |
HIP 109297 |
23.57 |
| 2026-02-16 12:00 |
22:07:50.39 |
-16:50:54.3 |
HIP 109297 |
17.30 |
| 2026-02-17 00:00 |
22:08:18.58 |
-16:48:24.5 |
HIP 109297 |
12.11 |
| 2026-02-17 12:00 |
22:08:46.76 |
-16:45:54.8 |
HIP 109297 |
9.89 |
| 2026-02-18 00:00 |
22:09:14.92 |
-16:43:25.1 |
HIP 109297 |
12.34 |
| 2026-02-18 12:00 |
22:09:43.08 |
-16:40:55.4 |
HIP 109297 |
17.61 |
| 2026-02-19 00:00 |
22:10:11.22 |
-16:38:25.7 |
HIP 109297 |
23.91 |
| 2026-02-19 12:00 |
22:10:39.34 |
-16:35:56.1 |
HIP 109500 |
23.74 |
| 2026-02-20 00:00 |
22:11:07.45 |
-16:33:26.4 |
HIP 109500 |
21.01 |
| 2026-02-20 12:00 |
22:11:35.54 |
-16:30:56.9 |
HIP 109500 |
20.56 |
| 2026-02-21 00:00 |
22:12:03.62 |
-16:28:27.4 |
HIP 109685 |
17.53 |
| 2026-02-21 12:00 |
22:12:31.68 |
-16:25:57.9 |
HIP 109685 |
14.12 |
| 2026-02-22 00:00 |
22:12:59.72 |
-16:23:28.5 |
HIP 109685 |
13.94 |
| 2026-02-22 12:00 |
22:13:27.74 |
-16:20:59.1 |
HIP 109685 |
17.08 |
| 2026-02-23 00:00 |
22:13:55.74 |
-16:18:29.8 |
HIP 109685 |
22.18 |
| 2026-02-23 12:00 |
22:14:23.72 |
-16:16:00.6 |
HIP 109822 |
27.17 |
| 2026-02-24 00:00 |
22:14:51.69 |
-16:13:31.4 |
HIP 109822 |
24.68 |