メタデータ
| 項目 |
値 |
| Designation |
C/1980 Y2 (Panther) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1981-01-27T07:35:59.709120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
200 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
6.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1981-02-26.0000000 |
| e |
0.99865714 |
| q (au) |
1.657187 |
| a (au) |
1234.075622 |
| i (deg) |
82.646128 |
| Ω (om, deg) |
332.000700 |
| ω (w, deg) |
105.597962 |
| M (ma, deg) |
0.000675 |
等級
散乱 + 全体線形
$$
M_a = (5.548 + 4.217\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.548 |
| n |
4.217 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.863 |
| δ90 |
1.000 |
| 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 |
| 1980-10-27 |
1981-01-26 |
+21.4786 |
-4.799 |
| 1981-01-27 |
1981-06-03 |
-0.3491 |
+0.057 |
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) |
| 2026-05-12 00:00 |
06:57:34.72 |
-70:56:25.5 |
HIP 33273 |
29.40 |
| 2026-05-12 12:00 |
06:57:37.75 |
-70:56:05.7 |
HIP 33273 |
29.20 |
| 2026-05-13 00:00 |
06:57:40.81 |
-70:55:46.0 |
HIP 33273 |
29.00 |
| 2026-05-13 12:00 |
06:57:43.90 |
-70:55:26.4 |
HIP 33273 |
28.82 |
| 2026-05-14 00:00 |
06:57:47.03 |
-70:55:06.9 |
HIP 33273 |
28.63 |
| 2026-05-14 12:00 |
06:57:50.18 |
-70:54:47.6 |
HIP 33273 |
28.46 |
| 2026-05-15 00:00 |
06:57:53.38 |
-70:54:28.4 |
HIP 33860 |
28.07 |
| 2026-05-15 12:00 |
06:57:56.60 |
-70:54:09.4 |
HIP 33860 |
27.66 |
| 2026-05-16 00:00 |
06:57:59.85 |
-70:53:50.5 |
HIP 33860 |
27.25 |
| 2026-05-16 12:00 |
06:58:03.14 |
-70:53:31.7 |
HIP 33860 |
26.84 |
| 2026-05-17 00:00 |
06:58:06.45 |
-70:53:13.1 |
HIP 33860 |
26.42 |
| 2026-05-17 12:00 |
06:58:09.80 |
-70:52:54.6 |
HIP 33860 |
26.01 |
| 2026-05-18 00:00 |
06:58:13.18 |
-70:52:36.3 |
HIP 33860 |
25.60 |
| 2026-05-18 12:00 |
06:58:16.58 |
-70:52:18.1 |
HIP 33860 |
25.19 |
| 2026-05-19 00:00 |
06:58:20.02 |
-70:52:00.0 |
HIP 33860 |
24.78 |
| 2026-05-19 12:00 |
06:58:23.49 |
-70:51:42.1 |
HIP 33860 |
24.36 |
| 2026-05-20 00:00 |
06:58:26.98 |
-70:51:24.4 |
HIP 33860 |
23.95 |
| 2026-05-20 12:00 |
06:58:30.50 |
-70:51:06.8 |
HIP 33860 |
23.54 |
| 2026-05-21 00:00 |
06:58:34.06 |
-70:50:49.3 |
HIP 33860 |
23.13 |
| 2026-05-21 12:00 |
06:58:37.64 |
-70:50:32.0 |
HIP 33860 |
22.72 |
| 2026-05-22 00:00 |
06:58:41.25 |
-70:50:14.9 |
HIP 33860 |
22.31 |
| 2026-05-22 12:00 |
06:58:44.88 |
-70:49:57.9 |
HIP 33860 |
21.90 |
| 2026-05-23 00:00 |
06:58:48.55 |
-70:49:41.1 |
HIP 33860 |
21.48 |
| 2026-05-23 12:00 |
06:58:52.24 |
-70:49:24.4 |
HIP 33860 |
21.07 |
| 2026-05-24 00:00 |
06:58:55.96 |
-70:49:07.9 |
HIP 33860 |
20.66 |
| 2026-05-24 12:00 |
06:58:59.70 |
-70:48:51.5 |
HIP 33860 |
20.26 |
| 2026-05-25 00:00 |
06:59:03.47 |
-70:48:35.3 |
HIP 33860 |
19.85 |
| 2026-05-25 12:00 |
06:59:07.27 |
-70:48:19.2 |
HIP 33860 |
19.44 |
| 2026-05-26 00:00 |
06:59:11.09 |
-70:48:03.4 |
HIP 33860 |
19.03 |
| 2026-05-26 12:00 |
06:59:14.94 |
-70:47:47.6 |
HIP 33860 |
18.62 |
| 2026-05-27 00:00 |
06:59:18.81 |
-70:47:32.1 |
HIP 33860 |
18.22 |
| 2026-05-27 12:00 |
06:59:22.70 |
-70:47:16.7 |
HIP 33860 |
17.81 |
| 2026-05-28 00:00 |
06:59:26.63 |
-70:47:01.4 |
HIP 33860 |
17.41 |
| 2026-05-28 12:00 |
06:59:30.57 |
-70:46:46.4 |
HIP 33860 |
17.00 |
| 2026-05-29 00:00 |
06:59:34.54 |
-70:46:31.5 |
HIP 33860 |
16.60 |
| 2026-05-29 12:00 |
06:59:38.53 |
-70:46:16.7 |
HIP 33860 |
16.20 |
| 2026-05-30 00:00 |
06:59:42.55 |
-70:46:02.2 |
HIP 33860 |
15.80 |
| 2026-05-30 12:00 |
06:59:46.59 |
-70:45:47.8 |
HIP 33860 |
15.40 |
| 2026-05-31 00:00 |
06:59:50.65 |
-70:45:33.5 |
HIP 33860 |
15.01 |
| 2026-05-31 12:00 |
06:59:54.74 |
-70:45:19.5 |
HIP 33860 |
14.61 |
| 2026-06-01 00:00 |
06:59:58.84 |
-70:45:05.6 |
HIP 33860 |
14.22 |
| 2026-06-01 12:00 |
07:00:02.97 |
-70:44:51.9 |
HIP 33860 |
13.83 |
| 2026-06-02 00:00 |
07:00:07.12 |
-70:44:38.3 |
HIP 33860 |
13.44 |