メタデータ
| 項目 |
値 |
| Designation |
C/2021 R2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-12-25T00:02:41.040960Z |
| Orbit solution date (soln_date, UTC) |
2022-12-08T23:43:01Z |
| Obs used |
126 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
10.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-09-05T08:07:54.134400Z |
| Discovery magnitude (MPC) |
20.48 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-11-08.0000000 |
| e |
0.99748693 |
| q (au) |
7.311968 |
| a (au) |
2909.581318 |
| i (deg) |
134.470894 |
| Ω (om, deg) |
16.283615 |
| ω (w, deg) |
32.298315 |
| M (ma, deg) |
359.999705 |
等級
散乱 + 全体線形
$$
M_a = (2.347 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.347 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-06-01 00:00 |
17:26:06.83 |
+22:04:31.5 |
HIP 85344 |
4.33 |
| 2026-06-01 12:00 |
17:25:52.64 |
+22:04:46.4 |
HIP 85344 |
7.32 |
| 2026-06-02 00:00 |
17:25:38.44 |
+22:05:00.3 |
HIP 85255 |
7.60 |
| 2026-06-02 12:00 |
17:25:24.22 |
+22:05:13.3 |
HIP 85255 |
5.78 |
| 2026-06-03 00:00 |
17:25:09.99 |
+22:05:25.3 |
HIP 85255 |
5.56 |
| 2026-06-03 12:00 |
17:24:55.74 |
+22:05:36.3 |
HIP 85255 |
7.10 |
| 2026-06-04 00:00 |
17:24:41.48 |
+22:05:46.4 |
HIP 85255 |
9.59 |
| 2026-06-04 12:00 |
17:24:27.21 |
+22:05:55.4 |
HIP 85255 |
12.48 |
| 2026-06-05 00:00 |
17:24:12.93 |
+22:06:03.5 |
HIP 85124 |
12.23 |
| 2026-06-05 12:00 |
17:23:58.64 |
+22:06:10.7 |
HIP 85124 |
11.24 |
| 2026-06-06 00:00 |
17:23:44.34 |
+22:06:16.8 |
HIP 85124 |
11.18 |
| 2026-06-06 12:00 |
17:23:30.04 |
+22:06:21.9 |
HIP 85124 |
12.04 |
| 2026-06-07 00:00 |
17:23:15.73 |
+22:06:26.1 |
HIP 85124 |
13.67 |
| 2026-06-07 12:00 |
17:23:01.41 |
+22:06:29.3 |
HIP 85124 |
15.82 |
| 2026-06-08 00:00 |
17:22:47.09 |
+22:06:31.5 |
HIP 85124 |
18.31 |
| 2026-06-08 12:00 |
17:22:32.77 |
+22:06:32.7 |
HIP 85124 |
21.03 |
| 2026-06-09 00:00 |
17:22:18.44 |
+22:06:32.9 |
HIP 85124 |
23.89 |
| 2026-06-09 12:00 |
17:22:04.12 |
+22:06:32.1 |
HIP 85124 |
26.85 |
| 2026-06-10 00:00 |
17:21:49.79 |
+22:06:30.4 |
HIP 85124 |
29.88 |
| 2026-06-10 12:00 |
17:21:35.47 |
+22:06:27.6 |
HIP 84768 |
29.47 |
| 2026-06-11 00:00 |
17:21:21.15 |
+22:06:23.8 |
HIP 84768 |
26.34 |
| 2026-06-11 12:00 |
17:21:06.83 |
+22:06:19.1 |
HIP 84768 |
23.26 |
| 2026-06-12 00:00 |
17:20:52.51 |
+22:06:13.4 |
HIP 84768 |
20.25 |
| 2026-06-12 12:00 |
17:20:38.20 |
+22:06:06.6 |
HIP 84768 |
17.35 |
| 2026-06-13 00:00 |
17:20:23.90 |
+22:05:58.9 |
HIP 84768 |
14.61 |
| 2026-06-13 12:00 |
17:20:09.61 |
+22:05:50.2 |
HIP 84768 |
12.15 |
| 2026-06-14 00:00 |
17:19:55.32 |
+22:05:40.4 |
HIP 84768 |
10.18 |
| 2026-06-14 12:00 |
17:19:41.05 |
+22:05:29.7 |
HIP 84768 |
9.01 |
| 2026-06-15 00:00 |
17:19:26.79 |
+22:05:18.0 |
HIP 84768 |
8.97 |
| 2026-06-15 12:00 |
17:19:12.53 |
+22:05:05.3 |
HIP 84768 |
10.07 |
| 2026-06-16 00:00 |
17:18:58.30 |
+22:04:51.6 |
HIP 84768 |
12.00 |
| 2026-06-16 12:00 |
17:18:44.07 |
+22:04:36.9 |
HIP 84768 |
14.42 |
| 2026-06-17 00:00 |
17:18:29.87 |
+22:04:21.2 |
HIP 84768 |
17.13 |
| 2026-06-17 12:00 |
17:18:15.68 |
+22:04:04.6 |
HIP 84768 |
20.01 |
| 2026-06-18 00:00 |
17:18:01.51 |
+22:03:46.9 |
HIP 84555 |
21.25 |
| 2026-06-18 12:00 |
17:17:47.35 |
+22:03:28.3 |
HIP 84555 |
19.68 |
| 2026-06-19 00:00 |
17:17:33.22 |
+22:03:08.7 |
HIP 84555 |
18.58 |
| 2026-06-19 12:00 |
17:17:19.11 |
+22:02:48.1 |
HIP 84555 |
18.05 |
| 2026-06-20 00:00 |
17:17:05.02 |
+22:02:26.5 |
HIP 84555 |
18.11 |
| 2026-06-20 12:00 |
17:16:50.95 |
+22:02:04.0 |
HIP 84555 |
18.78 |
| 2026-06-21 00:00 |
17:16:36.91 |
+22:01:40.5 |
HIP 84555 |
19.98 |
| 2026-06-21 12:00 |
17:16:22.90 |
+22:01:16.0 |
HIP 84555 |
21.63 |
| 2026-06-22 00:00 |
17:16:08.91 |
+22:00:50.6 |
HIP 84555 |
23.62 |