メタデータ
| 項目 |
値 |
| Designation |
C/2014 S1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-10-30T07:51:49.150080Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:12:31Z |
| Obs used |
45 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-10-25.0000000 |
| e |
1.00078324 |
| q (au) |
8.137341 |
| a (au) |
-10389.297965 |
| i (deg) |
123.804132 |
| Ω (om, deg) |
352.660639 |
| ω (w, deg) |
288.827322 |
| M (ma, deg) |
0.000335 |
等級
散乱 + 全体線形
$$
M_a = (10.564 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.564 |
| n |
2.000 |
| gf |
0.930 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
9.552 |
| 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 |
| 2014-01-14 |
2015-12-09 |
-160.7524 |
+148.263 |
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) |
| 2026-09-20 00:00 |
21:10:16.50 |
+18:31:14.5 |
HIP 104416 |
38.20 |
| 2026-09-20 12:00 |
21:10:12.26 |
+18:30:39.1 |
HIP 104416 |
38.33 |
| 2026-09-21 00:00 |
21:10:08.04 |
+18:30:03.5 |
HIP 104416 |
38.49 |
| 2026-09-21 12:00 |
21:10:03.86 |
+18:29:27.7 |
HIP 104416 |
38.69 |
| 2026-09-22 00:00 |
21:09:59.71 |
+18:28:51.9 |
HIP 104416 |
38.93 |
| 2026-09-22 12:00 |
21:09:55.60 |
+18:28:15.8 |
HIP 104416 |
39.21 |
| 2026-09-23 00:00 |
21:09:51.51 |
+18:27:39.7 |
HIP 104416 |
39.52 |
| 2026-09-23 12:00 |
21:09:47.45 |
+18:27:03.4 |
HIP 104416 |
39.87 |
| 2026-09-24 00:00 |
21:09:43.43 |
+18:26:27.0 |
HIP 104416 |
40.25 |
| 2026-09-24 12:00 |
21:09:39.44 |
+18:25:50.4 |
HIP 104393 |
39.41 |
| 2026-09-25 00:00 |
21:09:35.48 |
+18:25:13.7 |
HIP 104393 |
38.58 |
| 2026-09-25 12:00 |
21:09:31.55 |
+18:24:37.0 |
HIP 104393 |
37.77 |
| 2026-09-26 00:00 |
21:09:27.65 |
+18:24:00.1 |
HIP 104393 |
36.97 |
| 2026-09-26 12:00 |
21:09:23.79 |
+18:23:23.1 |
HIP 104393 |
36.18 |
| 2026-09-27 00:00 |
21:09:19.97 |
+18:22:45.9 |
HIP 104393 |
35.41 |
| 2026-09-27 12:00 |
21:09:16.17 |
+18:22:08.7 |
HIP 104393 |
34.66 |
| 2026-09-28 00:00 |
21:09:12.41 |
+18:21:31.4 |
HIP 104393 |
33.93 |
| 2026-09-28 12:00 |
21:09:08.68 |
+18:20:53.9 |
HIP 104393 |
33.21 |
| 2026-09-29 00:00 |
21:09:04.99 |
+18:20:16.4 |
HIP 104393 |
32.52 |
| 2026-09-29 12:00 |
21:09:01.33 |
+18:19:38.8 |
HIP 104393 |
31.84 |
| 2026-09-30 00:00 |
21:08:57.70 |
+18:19:01.1 |
HIP 104393 |
31.19 |
| 2026-09-30 12:00 |
21:08:54.11 |
+18:18:23.3 |
HIP 104393 |
30.56 |
| 2026-10-01 00:00 |
21:08:50.56 |
+18:17:45.4 |
HIP 104393 |
29.95 |
| 2026-10-01 12:00 |
21:08:47.04 |
+18:17:07.5 |
HIP 104393 |
29.36 |
| 2026-10-02 00:00 |
21:08:43.56 |
+18:16:29.4 |
HIP 104393 |
28.80 |
| 2026-10-02 12:00 |
21:08:40.11 |
+18:15:51.3 |
HIP 104393 |
28.26 |
| 2026-10-03 00:00 |
21:08:36.69 |
+18:15:13.2 |
HIP 104393 |
27.75 |
| 2026-10-03 12:00 |
21:08:33.32 |
+18:14:34.9 |
HIP 104393 |
27.27 |
| 2026-10-04 00:00 |
21:08:29.98 |
+18:13:56.6 |
HIP 104393 |
26.81 |
| 2026-10-04 12:00 |
21:08:26.67 |
+18:13:18.3 |
HIP 104393 |
26.38 |
| 2026-10-05 00:00 |
21:08:23.40 |
+18:12:39.8 |
HIP 104393 |
25.98 |
| 2026-10-05 12:00 |
21:08:20.17 |
+18:12:01.4 |
HIP 104393 |
25.61 |
| 2026-10-06 00:00 |
21:08:16.98 |
+18:11:22.8 |
HIP 104393 |
25.27 |
| 2026-10-06 12:00 |
21:08:13.82 |
+18:10:44.3 |
HIP 104393 |
24.96 |
| 2026-10-07 00:00 |
21:08:10.70 |
+18:10:05.7 |
HIP 104393 |
24.68 |
| 2026-10-07 12:00 |
21:08:07.62 |
+18:09:27.0 |
HIP 104393 |
24.44 |
| 2026-10-08 00:00 |
21:08:04.58 |
+18:08:48.4 |
HIP 104393 |
24.22 |
| 2026-10-08 12:00 |
21:08:01.57 |
+18:08:09.7 |
HIP 104393 |
24.04 |
| 2026-10-09 00:00 |
21:07:58.61 |
+18:07:30.9 |
HIP 104393 |
23.89 |
| 2026-10-09 12:00 |
21:07:55.68 |
+18:06:52.2 |
HIP 104393 |
23.77 |
| 2026-10-10 00:00 |
21:07:52.79 |
+18:06:13.4 |
HIP 104393 |
23.68 |
| 2026-10-10 12:00 |
21:07:49.94 |
+18:05:34.6 |
HIP 104393 |
23.63 |
| 2026-10-11 00:00 |
21:07:47.13 |
+18:04:55.8 |
HIP 104393 |
23.60 |