メタデータ
| 項目 |
値 |
| Designation |
431P/Scotti |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-09-09T08:10:57.241920Z |
| Orbit solution date (soln_date, UTC) |
2025-01-02T20:13:02Z |
| Obs used |
519 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
19.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-08-07.0000000 |
| e |
0.48795756 |
| q (au) |
1.762569 |
| a (au) |
3.442232 |
| i (deg) |
22.671799 |
| Ω (om, deg) |
203.270091 |
| ω (w, deg) |
199.435229 |
| M (ma, deg) |
107.668137 |
等級
散乱 + 全体線形
$$
M_a = (12.900 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.900 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 2021-09-02 |
2022-03-01 |
+12.0411 |
-3.322 |
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 |
16:50:22.88 |
-06:37:06.8 |
HIP 82183 |
50.31 |
| 2026-03-26 12:00 |
16:50:22.90 |
-06:34:49.5 |
HIP 82183 |
49.29 |
| 2026-03-27 00:00 |
16:50:22.71 |
-06:32:31.6 |
HIP 82183 |
48.30 |
| 2026-03-27 12:00 |
16:50:22.30 |
-06:30:13.2 |
HIP 82183 |
47.34 |
| 2026-03-28 00:00 |
16:50:21.69 |
-06:27:54.4 |
HIP 82183 |
46.43 |
| 2026-03-28 12:00 |
16:50:20.85 |
-06:25:35.0 |
HIP 82183 |
45.56 |
| 2026-03-29 00:00 |
16:50:19.80 |
-06:23:15.2 |
HIP 82183 |
44.75 |
| 2026-03-29 12:00 |
16:50:18.54 |
-06:20:54.9 |
HIP 82183 |
43.99 |
| 2026-03-30 00:00 |
16:50:17.06 |
-06:18:34.1 |
HIP 82537 |
42.90 |
| 2026-03-30 12:00 |
16:50:15.37 |
-06:16:12.9 |
HIP 82537 |
41.52 |
| 2026-03-31 00:00 |
16:50:13.46 |
-06:13:51.3 |
HIP 82537 |
40.27 |
| 2026-03-31 12:00 |
16:50:11.33 |
-06:11:29.2 |
HIP 82537 |
39.17 |
| 2026-04-01 00:00 |
16:50:09.00 |
-06:09:06.6 |
HIP 82537 |
38.23 |
| 2026-04-01 12:00 |
16:50:06.44 |
-06:06:43.7 |
HIP 82537 |
37.46 |
| 2026-04-02 00:00 |
16:50:03.67 |
-06:04:20.4 |
HIP 82537 |
36.89 |
| 2026-04-02 12:00 |
16:50:00.68 |
-06:01:56.6 |
HIP 82537 |
36.53 |
| 2026-04-03 00:00 |
16:49:57.48 |
-05:59:32.5 |
HIP 82537 |
36.39 |
| 2026-04-03 12:00 |
16:49:54.06 |
-05:57:08.0 |
HIP 82537 |
36.47 |
| 2026-04-04 00:00 |
16:49:50.42 |
-05:54:43.1 |
HIP 82537 |
36.79 |
| 2026-04-04 12:00 |
16:49:46.57 |
-05:52:17.9 |
HIP 82537 |
37.33 |
| 2026-04-05 00:00 |
16:49:42.51 |
-05:49:52.3 |
HIP 82537 |
38.09 |
| 2026-04-05 12:00 |
16:49:38.22 |
-05:47:26.4 |
HIP 82537 |
39.07 |
| 2026-04-06 00:00 |
16:49:33.72 |
-05:45:00.2 |
HIP 82537 |
40.26 |
| 2026-04-06 12:00 |
16:49:29.01 |
-05:42:33.6 |
HIP 82537 |
41.64 |
| 2026-04-07 00:00 |
16:49:24.07 |
-05:40:06.8 |
HIP 82301 |
41.49 |
| 2026-04-07 12:00 |
16:49:18.93 |
-05:37:39.6 |
HIP 82301 |
38.88 |
| 2026-04-08 00:00 |
16:49:13.56 |
-05:35:12.2 |
HIP 82301 |
36.28 |
| 2026-04-08 12:00 |
16:49:07.99 |
-05:32:44.5 |
HIP 82301 |
33.71 |
| 2026-04-09 00:00 |
16:49:02.19 |
-05:30:16.5 |
HIP 82301 |
31.18 |
| 2026-04-09 12:00 |
16:48:56.18 |
-05:27:48.3 |
HIP 82301 |
28.70 |
| 2026-04-10 00:00 |
16:48:49.96 |
-05:25:19.9 |
HIP 82301 |
26.31 |
| 2026-04-10 12:00 |
16:48:43.52 |
-05:22:51.2 |
HIP 82301 |
24.04 |
| 2026-04-11 00:00 |
16:48:36.87 |
-05:20:22.4 |
HIP 82301 |
21.94 |
| 2026-04-11 12:00 |
16:48:30.01 |
-05:17:53.3 |
HIP 82301 |
20.09 |
| 2026-04-12 00:00 |
16:48:22.93 |
-05:15:24.1 |
HIP 82301 |
18.56 |
| 2026-04-12 12:00 |
16:48:15.63 |
-05:12:54.7 |
HIP 82301 |
17.47 |
| 2026-04-13 00:00 |
16:48:08.13 |
-05:10:25.1 |
HIP 82301 |
16.91 |
| 2026-04-13 12:00 |
16:48:00.41 |
-05:07:55.4 |
HIP 82301 |
16.97 |
| 2026-04-14 00:00 |
16:47:52.49 |
-05:05:25.6 |
HIP 82301 |
17.64 |
| 2026-04-14 12:00 |
16:47:44.35 |
-05:02:55.6 |
HIP 82301 |
18.89 |
| 2026-04-15 00:00 |
16:47:36.00 |
-05:00:25.6 |
HIP 82301 |
20.62 |
| 2026-04-15 12:00 |
16:47:27.44 |
-04:57:55.5 |
HIP 82301 |
22.74 |
| 2026-04-16 00:00 |
16:47:18.68 |
-04:55:25.3 |
HIP 82301 |
25.17 |