メタデータ
| 項目 |
値 |
| Designation |
38P/Stephan-Oterma |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-11-10T23:41:26.018880Z |
| Orbit solution date (soln_date, UTC) |
2024-12-04T09:13:02Z |
| Obs used |
3293 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
9.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-05-28.0000000 |
| e |
0.85928734 |
| q (au) |
1.588509 |
| a (au) |
11.289028 |
| i (deg) |
18.352950 |
| Ω (om, deg) |
78.000299 |
| ω (w, deg) |
359.588512 |
| M (ma, deg) |
355.660875 |
等級
散乱 + 全体線形
$$
M_a = (10.352 + 4.047\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.352 |
| n |
4.047 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2017-06-24 |
2018-11-10 |
+2.7675 |
-1.692 |
| 2018-11-11 |
2020-05-21 |
+1.0409 |
-0.769 |
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 |
16:03:31.75 |
-14:04:35.3 |
HIP 78600 |
18.61 |
| 2026-03-26 12:00 |
16:03:28.25 |
-14:04:17.7 |
HIP 78600 |
17.92 |
| 2026-03-27 00:00 |
16:03:24.69 |
-14:04:00.0 |
HIP 78600 |
17.25 |
| 2026-03-27 12:00 |
16:03:21.07 |
-14:03:42.1 |
HIP 78600 |
16.59 |
| 2026-03-28 00:00 |
16:03:17.39 |
-14:03:24.1 |
HIP 78600 |
15.95 |
| 2026-03-28 12:00 |
16:03:13.64 |
-14:03:06.0 |
HIP 78600 |
15.33 |
| 2026-03-29 00:00 |
16:03:09.84 |
-14:02:47.8 |
HIP 78600 |
14.75 |
| 2026-03-29 12:00 |
16:03:05.98 |
-14:02:29.4 |
HIP 78600 |
14.20 |
| 2026-03-30 00:00 |
16:03:02.06 |
-14:02:11.0 |
HIP 78600 |
13.69 |
| 2026-03-30 12:00 |
16:02:58.08 |
-14:01:52.5 |
HIP 78600 |
13.24 |
| 2026-03-31 00:00 |
16:02:54.04 |
-14:01:33.8 |
HIP 78600 |
12.85 |
| 2026-03-31 12:00 |
16:02:49.94 |
-14:01:15.1 |
HIP 78600 |
12.54 |
| 2026-04-01 00:00 |
16:02:45.78 |
-14:00:56.2 |
HIP 78600 |
12.30 |
| 2026-04-01 12:00 |
16:02:41.57 |
-14:00:37.3 |
HIP 78600 |
12.15 |
| 2026-04-02 00:00 |
16:02:37.30 |
-14:00:18.2 |
HIP 78600 |
12.10 |
| 2026-04-02 12:00 |
16:02:32.97 |
-13:59:59.1 |
HIP 78600 |
12.15 |
| 2026-04-03 00:00 |
16:02:28.59 |
-13:59:39.8 |
HIP 78600 |
12.30 |
| 2026-04-03 12:00 |
16:02:24.15 |
-13:59:20.5 |
HIP 78600 |
12.55 |
| 2026-04-04 00:00 |
16:02:19.66 |
-13:59:01.1 |
HIP 78600 |
12.90 |
| 2026-04-04 12:00 |
16:02:15.11 |
-13:58:41.6 |
HIP 78600 |
13.35 |
| 2026-04-05 00:00 |
16:02:10.50 |
-13:58:22.0 |
HIP 78600 |
13.89 |
| 2026-04-05 12:00 |
16:02:05.84 |
-13:58:02.3 |
HIP 78600 |
14.51 |
| 2026-04-06 00:00 |
16:02:01.13 |
-13:57:42.5 |
HIP 78600 |
15.21 |
| 2026-04-06 12:00 |
16:01:56.36 |
-13:57:22.6 |
HIP 78600 |
15.98 |
| 2026-04-07 00:00 |
16:01:51.54 |
-13:57:02.7 |
HIP 78600 |
16.81 |
| 2026-04-07 12:00 |
16:01:46.66 |
-13:56:42.6 |
HIP 78600 |
17.69 |
| 2026-04-08 00:00 |
16:01:41.74 |
-13:56:22.5 |
HIP 78600 |
18.63 |
| 2026-04-08 12:00 |
16:01:36.76 |
-13:56:02.4 |
HIP 78600 |
19.61 |
| 2026-04-09 00:00 |
16:01:31.73 |
-13:55:42.1 |
HIP 78600 |
20.63 |
| 2026-04-09 12:00 |
16:01:26.65 |
-13:55:21.8 |
HIP 78600 |
21.69 |
| 2026-04-10 00:00 |
16:01:21.51 |
-13:55:01.4 |
HIP 78600 |
22.78 |
| 2026-04-10 12:00 |
16:01:16.33 |
-13:54:40.9 |
HIP 78600 |
23.90 |
| 2026-04-11 00:00 |
16:01:11.10 |
-13:54:20.4 |
HIP 78600 |
25.06 |
| 2026-04-11 12:00 |
16:01:05.81 |
-13:53:59.8 |
HIP 78600 |
26.24 |
| 2026-04-12 00:00 |
16:01:00.48 |
-13:53:39.1 |
HIP 78600 |
27.44 |
| 2026-04-12 12:00 |
16:00:55.10 |
-13:53:18.4 |
HIP 78600 |
28.67 |
| 2026-04-13 00:00 |
16:00:49.67 |
-13:52:57.7 |
HIP 78600 |
29.92 |
| 2026-04-13 12:00 |
16:00:44.20 |
-13:52:36.8 |
HIP 78600 |
31.19 |
| 2026-04-14 00:00 |
16:00:38.67 |
-13:52:15.9 |
HIP 78600 |
32.49 |
| 2026-04-14 12:00 |
16:00:33.10 |
-13:51:55.0 |
HIP 78600 |
33.80 |
| 2026-04-15 00:00 |
16:00:27.49 |
-13:51:34.0 |
HIP 78458 |
34.87 |
| 2026-04-15 12:00 |
16:00:21.82 |
-13:51:13.0 |
HIP 78458 |
35.57 |
| 2026-04-16 00:00 |
16:00:16.12 |
-13:50:51.9 |
HIP 78228 |
36.02 |