メタデータ
| 項目 |
値 |
| Designation |
C/2012 S3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-08-31T03:14:37.167360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:22Z |
| Obs used |
730 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-05-22.0000000 |
| e |
1.00070829 |
| q (au) |
2.308066 |
| a (au) |
-3258.643490 |
| i (deg) |
112.930798 |
| Ω (om, deg) |
121.305818 |
| ω (w, deg) |
183.752733 |
| M (ma, deg) |
-0.000536 |
等級
散乱 + 全体線形
$$
M_a = (12.451 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.451 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
08:39:52.72 |
-08:27:44.8 |
HIP 42409 |
16.32 |
| 2026-09-20 12:00 |
08:39:55.12 |
-08:28:09.8 |
HIP 42409 |
16.74 |
| 2026-09-21 00:00 |
08:39:57.49 |
-08:28:34.9 |
HIP 42409 |
17.18 |
| 2026-09-21 12:00 |
08:39:59.84 |
-08:29:00.1 |
HIP 42409 |
17.63 |
| 2026-09-22 00:00 |
08:40:02.17 |
-08:29:25.3 |
HIP 42409 |
18.09 |
| 2026-09-22 12:00 |
08:40:04.47 |
-08:29:50.6 |
HIP 42409 |
18.56 |
| 2026-09-23 00:00 |
08:40:06.74 |
-08:30:15.9 |
HIP 42409 |
19.04 |
| 2026-09-23 12:00 |
08:40:08.99 |
-08:30:41.3 |
HIP 42409 |
19.52 |
| 2026-09-24 00:00 |
08:40:11.21 |
-08:31:06.7 |
HIP 42409 |
20.02 |
| 2026-09-24 12:00 |
08:40:13.41 |
-08:31:32.2 |
HIP 42409 |
20.51 |
| 2026-09-25 00:00 |
08:40:15.58 |
-08:31:57.8 |
HIP 42409 |
21.01 |
| 2026-09-25 12:00 |
08:40:17.73 |
-08:32:23.3 |
HIP 42409 |
21.52 |
| 2026-09-26 00:00 |
08:40:19.84 |
-08:32:49.0 |
HIP 42409 |
22.03 |
| 2026-09-26 12:00 |
08:40:21.94 |
-08:33:14.6 |
HIP 42670 |
21.62 |
| 2026-09-27 00:00 |
08:40:24.00 |
-08:33:40.3 |
HIP 42670 |
21.10 |
| 2026-09-27 12:00 |
08:40:26.04 |
-08:34:06.1 |
HIP 42670 |
20.60 |
| 2026-09-28 00:00 |
08:40:28.05 |
-08:34:31.9 |
HIP 42670 |
20.12 |
| 2026-09-28 12:00 |
08:40:30.03 |
-08:34:57.7 |
HIP 42670 |
19.66 |
| 2026-09-29 00:00 |
08:40:31.99 |
-08:35:23.5 |
HIP 42670 |
19.21 |
| 2026-09-29 12:00 |
08:40:33.92 |
-08:35:49.4 |
HIP 42670 |
18.78 |
| 2026-09-30 00:00 |
08:40:35.82 |
-08:36:15.3 |
HIP 42670 |
18.37 |
| 2026-09-30 12:00 |
08:40:37.69 |
-08:36:41.3 |
HIP 42670 |
17.98 |
| 2026-10-01 00:00 |
08:40:39.54 |
-08:37:07.2 |
HIP 42670 |
17.62 |
| 2026-10-01 12:00 |
08:40:41.36 |
-08:37:33.2 |
HIP 42670 |
17.27 |
| 2026-10-02 00:00 |
08:40:43.14 |
-08:37:59.3 |
HIP 42670 |
16.95 |
| 2026-10-02 12:00 |
08:40:44.90 |
-08:38:25.3 |
HIP 42670 |
16.65 |
| 2026-10-03 00:00 |
08:40:46.64 |
-08:38:51.3 |
HIP 42670 |
16.37 |
| 2026-10-03 12:00 |
08:40:48.34 |
-08:39:17.4 |
HIP 42670 |
16.12 |
| 2026-10-04 00:00 |
08:40:50.01 |
-08:39:43.5 |
HIP 42670 |
15.90 |
| 2026-10-04 12:00 |
08:40:51.66 |
-08:40:09.6 |
HIP 42670 |
15.70 |
| 2026-10-05 00:00 |
08:40:53.27 |
-08:40:35.7 |
HIP 42670 |
15.53 |
| 2026-10-05 12:00 |
08:40:54.86 |
-08:41:01.8 |
HIP 42670 |
15.39 |
| 2026-10-06 00:00 |
08:40:56.41 |
-08:41:27.9 |
HIP 42670 |
15.27 |
| 2026-10-06 12:00 |
08:40:57.94 |
-08:41:54.0 |
HIP 42670 |
15.19 |
| 2026-10-07 00:00 |
08:40:59.44 |
-08:42:20.2 |
HIP 42670 |
15.13 |
| 2026-10-07 12:00 |
08:41:00.90 |
-08:42:46.3 |
HIP 42670 |
15.09 |
| 2026-10-08 00:00 |
08:41:02.34 |
-08:43:12.4 |
HIP 42670 |
15.09 |
| 2026-10-08 12:00 |
08:41:03.74 |
-08:43:38.5 |
HIP 42670 |
15.11 |
| 2026-10-09 00:00 |
08:41:05.12 |
-08:44:04.6 |
HIP 42670 |
15.15 |
| 2026-10-09 12:00 |
08:41:06.46 |
-08:44:30.7 |
HIP 42670 |
15.22 |
| 2026-10-10 00:00 |
08:41:07.77 |
-08:44:56.7 |
HIP 42670 |
15.32 |
| 2026-10-10 12:00 |
08:41:09.05 |
-08:45:22.8 |
HIP 42670 |
15.44 |
| 2026-10-11 00:00 |
08:41:10.30 |
-08:45:48.8 |
HIP 42670 |
15.58 |