メタデータ
| 項目 |
値 |
| Designation |
C/2012 V1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-07-21T12:56:16.166400Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:04Z |
| Obs used |
98 |
| NEO |
- |
| M1 |
15.200 |
| 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) |
2012-12-06.0000000 |
| e |
0.99939324 |
| q (au) |
2.089202 |
| a (au) |
3443.236545 |
| i (deg) |
157.839966 |
| Ω (om, deg) |
85.369420 |
| ω (w, deg) |
123.335286 |
| M (ma, deg) |
359.998890 |
等級
散乱 + 全体線形
$$
M_a = (16.808 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.808 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.649 |
| k |
0.800 |
| 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) |
| 2026-05-12 00:00 |
10:51:53.02 |
-17:15:42.1 |
HIP 53174 |
12.30 |
| 2026-05-12 12:00 |
10:51:51.34 |
-17:15:08.6 |
HIP 53174 |
12.91 |
| 2026-05-13 00:00 |
10:51:49.68 |
-17:14:35.1 |
HIP 53174 |
13.52 |
| 2026-05-13 12:00 |
10:51:48.06 |
-17:14:01.8 |
HIP 53174 |
14.14 |
| 2026-05-14 00:00 |
10:51:46.47 |
-17:13:28.6 |
HIP 53174 |
14.75 |
| 2026-05-14 12:00 |
10:51:44.92 |
-17:12:55.5 |
HIP 53174 |
15.35 |
| 2026-05-15 00:00 |
10:51:43.40 |
-17:12:22.5 |
HIP 53174 |
15.96 |
| 2026-05-15 12:00 |
10:51:41.91 |
-17:11:49.7 |
HIP 53174 |
16.56 |
| 2026-05-16 00:00 |
10:51:40.45 |
-17:11:17.0 |
HIP 53172 |
16.97 |
| 2026-05-16 12:00 |
10:51:39.03 |
-17:10:44.4 |
HIP 53172 |
16.96 |
| 2026-05-17 00:00 |
10:51:37.65 |
-17:10:12.0 |
HIP 53172 |
16.96 |
| 2026-05-17 12:00 |
10:51:36.30 |
-17:09:39.7 |
HIP 53172 |
16.99 |
| 2026-05-18 00:00 |
10:51:34.98 |
-17:09:07.6 |
HIP 53172 |
17.03 |
| 2026-05-18 12:00 |
10:51:33.69 |
-17:08:35.5 |
HIP 53172 |
17.09 |
| 2026-05-19 00:00 |
10:51:32.44 |
-17:08:03.7 |
HIP 53172 |
17.17 |
| 2026-05-19 12:00 |
10:51:31.23 |
-17:07:32.0 |
HIP 53172 |
17.25 |
| 2026-05-20 00:00 |
10:51:30.04 |
-17:07:00.4 |
HIP 53172 |
17.36 |
| 2026-05-20 12:00 |
10:51:28.89 |
-17:06:29.0 |
HIP 53172 |
17.47 |
| 2026-05-21 00:00 |
10:51:27.78 |
-17:05:57.7 |
HIP 53172 |
17.60 |
| 2026-05-21 12:00 |
10:51:26.70 |
-17:05:26.6 |
HIP 53172 |
17.73 |
| 2026-05-22 00:00 |
10:51:25.65 |
-17:04:55.6 |
HIP 53172 |
17.88 |
| 2026-05-22 12:00 |
10:51:24.64 |
-17:04:24.8 |
HIP 53172 |
18.04 |
| 2026-05-23 00:00 |
10:51:23.66 |
-17:03:54.2 |
HIP 53172 |
18.21 |
| 2026-05-23 12:00 |
10:51:22.72 |
-17:03:23.7 |
HIP 53172 |
18.38 |
| 2026-05-24 00:00 |
10:51:21.81 |
-17:02:53.4 |
HIP 53172 |
18.56 |
| 2026-05-24 12:00 |
10:51:20.93 |
-17:02:23.3 |
HIP 53172 |
18.75 |
| 2026-05-25 00:00 |
10:51:20.09 |
-17:01:53.3 |
HIP 53172 |
18.94 |
| 2026-05-25 12:00 |
10:51:19.28 |
-17:01:23.5 |
HIP 53172 |
19.14 |
| 2026-05-26 00:00 |
10:51:18.50 |
-17:00:53.9 |
HIP 53172 |
19.34 |
| 2026-05-26 12:00 |
10:51:17.76 |
-17:00:24.4 |
HIP 53172 |
19.55 |
| 2026-05-27 00:00 |
10:51:17.05 |
-16:59:55.1 |
HIP 53172 |
19.76 |
| 2026-05-27 12:00 |
10:51:16.38 |
-16:59:26.0 |
HIP 53172 |
19.97 |
| 2026-05-28 00:00 |
10:51:15.74 |
-16:58:57.1 |
HIP 53172 |
20.18 |
| 2026-05-28 12:00 |
10:51:15.13 |
-16:58:28.3 |
HIP 53172 |
20.40 |
| 2026-05-29 00:00 |
10:51:14.56 |
-16:57:59.8 |
HIP 53172 |
20.62 |
| 2026-05-29 12:00 |
10:51:14.02 |
-16:57:31.4 |
HIP 53172 |
20.84 |
| 2026-05-30 00:00 |
10:51:13.51 |
-16:57:03.2 |
HIP 53172 |
21.06 |
| 2026-05-30 12:00 |
10:51:13.04 |
-16:56:35.2 |
HIP 53172 |
21.28 |
| 2026-05-31 00:00 |
10:51:12.60 |
-16:56:07.3 |
HIP 53172 |
21.50 |
| 2026-05-31 12:00 |
10:51:12.20 |
-16:55:39.7 |
HIP 53172 |
21.72 |
| 2026-06-01 00:00 |
10:51:11.83 |
-16:55:12.2 |
HIP 53172 |
21.93 |
| 2026-06-01 12:00 |
10:51:11.49 |
-16:54:45.0 |
HIP 53172 |
22.15 |
| 2026-06-02 00:00 |
10:51:11.18 |
-16:54:17.9 |
HIP 53172 |
22.37 |