メタデータ
| 項目 |
値 |
| Designation |
P/2021 R1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-12-17T19:36:46.062720Z |
| Orbit solution date (soln_date, UTC) |
2022-12-08T23:43:17Z |
| Obs used |
127 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
15.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-09-04T08:31:35.241600Z |
| Discovery magnitude (MPC) |
20.60 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-02-25.0000000 |
| e |
0.41886575 |
| q (au) |
4.885582 |
| a (au) |
8.406977 |
| i (deg) |
5.521079 |
| Ω (om, deg) |
143.406228 |
| ω (w, deg) |
220.343748 |
| M (ma, deg) |
2.797322 |
等級
散乱 + 全体線形
$$
M_a = (7.514 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.514 |
| n |
6.000 |
| gf |
0.924 |
| gb |
-0.916 |
| k |
1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
07:40:57.38 |
+19:15:33.7 |
HIP 37381 |
9.84 |
| 2026-06-01 12:00 |
07:41:11.63 |
+19:15:09.2 |
HIP 37381 |
12.89 |
| 2026-06-02 00:00 |
07:41:25.94 |
+19:14:44.4 |
HIP 37381 |
16.09 |
| 2026-06-02 12:00 |
07:41:40.30 |
+19:14:19.3 |
HIP 37381 |
19.37 |
| 2026-06-03 00:00 |
07:41:54.71 |
+19:13:54.0 |
HIP 37644 |
22.60 |
| 2026-06-03 12:00 |
07:42:09.18 |
+19:13:28.4 |
HIP 37644 |
19.28 |
| 2026-06-04 00:00 |
07:42:23.70 |
+19:13:02.5 |
HIP 37644 |
16.00 |
| 2026-06-04 12:00 |
07:42:38.27 |
+19:12:36.4 |
HIP 37644 |
12.80 |
| 2026-06-05 00:00 |
07:42:52.89 |
+19:12:10.0 |
HIP 37644 |
9.77 |
| 2026-06-05 12:00 |
07:43:07.57 |
+19:11:43.4 |
HIP 37644 |
7.15 |
| 2026-06-06 00:00 |
07:43:22.29 |
+19:11:16.5 |
HIP 37644 |
5.60 |
| 2026-06-06 12:00 |
07:43:37.06 |
+19:10:49.3 |
HIP 37644 |
6.01 |
| 2026-06-07 00:00 |
07:43:51.88 |
+19:10:21.9 |
HIP 37644 |
8.11 |
| 2026-06-07 12:00 |
07:44:06.75 |
+19:09:54.3 |
HIP 37644 |
10.99 |
| 2026-06-08 00:00 |
07:44:21.66 |
+19:09:26.3 |
HIP 37644 |
14.17 |
| 2026-06-08 12:00 |
07:44:36.63 |
+19:08:58.1 |
HIP 37644 |
17.52 |
| 2026-06-09 00:00 |
07:44:51.63 |
+19:08:29.7 |
HIP 37644 |
20.94 |
| 2026-06-09 12:00 |
07:45:06.69 |
+19:08:01.0 |
HIP 37644 |
24.43 |
| 2026-06-10 00:00 |
07:45:21.79 |
+19:07:32.0 |
HIP 37644 |
27.94 |
| 2026-06-10 12:00 |
07:45:36.93 |
+19:07:02.8 |
HIP 38027 |
28.25 |
| 2026-06-11 00:00 |
07:45:52.12 |
+19:06:33.3 |
HIP 38027 |
24.63 |
| 2026-06-11 12:00 |
07:46:07.36 |
+19:06:03.6 |
HIP 38027 |
21.00 |
| 2026-06-12 00:00 |
07:46:22.63 |
+19:05:33.6 |
HIP 38027 |
17.35 |
| 2026-06-12 12:00 |
07:46:37.95 |
+19:05:03.4 |
HIP 38027 |
13.70 |
| 2026-06-13 00:00 |
07:46:53.31 |
+19:04:32.9 |
HIP 38027 |
10.04 |
| 2026-06-13 12:00 |
07:47:08.70 |
+19:04:02.2 |
HIP 38027 |
6.37 |
| 2026-06-14 00:00 |
07:47:24.14 |
+19:03:31.2 |
HIP 38027 |
2.71 |
| 2026-06-14 12:00 |
07:47:39.62 |
+19:03:00.0 |
HIP 38027 |
1.12 |
| 2026-06-15 00:00 |
07:47:55.14 |
+19:02:28.5 |
HIP 38027 |
4.75 |
| 2026-06-15 12:00 |
07:48:10.70 |
+19:01:56.8 |
HIP 38027 |
8.45 |
| 2026-06-16 00:00 |
07:48:26.29 |
+19:01:24.8 |
HIP 38027 |
12.17 |
| 2026-06-16 12:00 |
07:48:41.92 |
+19:00:52.6 |
HIP 38027 |
15.90 |
| 2026-06-17 00:00 |
07:48:57.59 |
+19:00:20.2 |
HIP 38027 |
19.64 |
| 2026-06-17 12:00 |
07:49:13.29 |
+18:59:47.5 |
HIP 38027 |
23.40 |
| 2026-06-18 00:00 |
07:49:29.02 |
+18:59:14.6 |
HIP 38252 |
27.13 |
| 2026-06-18 12:00 |
07:49:44.80 |
+18:58:41.4 |
HIP 38252 |
26.56 |
| 2026-06-19 00:00 |
07:50:00.60 |
+18:58:08.0 |
HIP 38332 |
23.81 |
| 2026-06-19 12:00 |
07:50:16.43 |
+18:57:34.4 |
HIP 38332 |
21.07 |
| 2026-06-20 00:00 |
07:50:32.30 |
+18:57:00.5 |
HIP 38332 |
18.69 |
| 2026-06-20 12:00 |
07:50:48.20 |
+18:56:26.4 |
HIP 38332 |
16.82 |
| 2026-06-21 00:00 |
07:51:04.13 |
+18:55:52.0 |
HIP 38332 |
15.68 |
| 2026-06-21 12:00 |
07:51:20.09 |
+18:55:17.5 |
HIP 38332 |
15.41 |
| 2026-06-22 00:00 |
07:51:36.08 |
+18:54:42.7 |
HIP 38332 |
16.08 |