メタデータ
| 項目 |
値 |
| Designation |
C/2021 R7 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-04-14T11:28:22.085760Z |
| Orbit solution date (soln_date, UTC) |
2022-12-08T23:43:02Z |
| Obs used |
63 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
14.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-09-05T10:13:05.577600Z |
| Discovery magnitude (MPC) |
22.01 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) |
2021-11-23.0000000 |
| e |
0.99519043 |
| q (au) |
5.640615 |
| a (au) |
1172.790949 |
| i (deg) |
158.854146 |
| Ω (om, deg) |
170.145186 |
| ω (w, deg) |
139.994299 |
| M (ma, deg) |
0.005461 |
等級
散乱 + 全体線形
$$
M_a = (7.384 + 5.410\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.384 |
| n |
5.410 |
| gf |
0.999 |
| gb |
-0.856 |
| 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 |
20:10:38.23 |
-39:34:31.7 |
HIP 99463 |
11.16 |
| 2026-06-01 12:00 |
20:10:27.81 |
-39:35:40.3 |
HIP 99463 |
13.32 |
| 2026-06-02 00:00 |
20:10:17.30 |
-39:36:48.9 |
HIP 99463 |
15.54 |
| 2026-06-02 12:00 |
20:10:06.70 |
-39:37:57.4 |
HIP 99463 |
17.80 |
| 2026-06-03 00:00 |
20:09:56.01 |
-39:39:05.7 |
HIP 99463 |
20.09 |
| 2026-06-03 12:00 |
20:09:45.24 |
-39:40:14.0 |
HIP 99185 |
21.45 |
| 2026-06-04 00:00 |
20:09:34.39 |
-39:41:22.1 |
HIP 99185 |
20.31 |
| 2026-06-04 12:00 |
20:09:23.45 |
-39:42:30.1 |
HIP 99185 |
19.38 |
| 2026-06-05 00:00 |
20:09:12.42 |
-39:43:38.0 |
HIP 99185 |
18.70 |
| 2026-06-05 12:00 |
20:09:01.32 |
-39:44:45.8 |
HIP 99185 |
18.31 |
| 2026-06-06 00:00 |
20:08:50.13 |
-39:45:53.4 |
HIP 99185 |
18.22 |
| 2026-06-06 12:00 |
20:08:38.85 |
-39:47:00.8 |
HIP 99185 |
18.45 |
| 2026-06-07 00:00 |
20:08:27.50 |
-39:48:08.1 |
HIP 99185 |
18.98 |
| 2026-06-07 12:00 |
20:08:16.07 |
-39:49:15.3 |
HIP 99185 |
19.81 |
| 2026-06-08 00:00 |
20:08:04.55 |
-39:50:22.2 |
HIP 99185 |
20.89 |
| 2026-06-08 12:00 |
20:07:52.96 |
-39:51:29.0 |
HIP 99185 |
22.20 |
| 2026-06-09 00:00 |
20:07:41.29 |
-39:52:35.7 |
HIP 99003 |
20.61 |
| 2026-06-09 12:00 |
20:07:29.54 |
-39:53:42.1 |
HIP 99003 |
18.13 |
| 2026-06-10 00:00 |
20:07:17.71 |
-39:54:48.4 |
HIP 99003 |
15.66 |
| 2026-06-10 12:00 |
20:07:05.80 |
-39:55:54.4 |
HIP 99003 |
13.19 |
| 2026-06-11 00:00 |
20:06:53.82 |
-39:57:00.3 |
HIP 99003 |
10.73 |
| 2026-06-11 12:00 |
20:06:41.76 |
-39:58:05.9 |
HIP 99003 |
8.32 |
| 2026-06-12 00:00 |
20:06:29.63 |
-39:59:11.4 |
HIP 99003 |
6.02 |
| 2026-06-12 12:00 |
20:06:17.42 |
-40:00:16.6 |
HIP 99003 |
4.03 |
| 2026-06-13 00:00 |
20:06:05.14 |
-40:01:21.6 |
HIP 99003 |
3.08 |
| 2026-06-13 12:00 |
20:05:52.79 |
-40:02:26.3 |
HIP 99003 |
4.02 |
| 2026-06-14 00:00 |
20:05:40.37 |
-40:03:30.8 |
HIP 99003 |
6.03 |
| 2026-06-14 12:00 |
20:05:27.87 |
-40:04:35.1 |
HIP 99003 |
8.39 |
| 2026-06-15 00:00 |
20:05:15.31 |
-40:05:39.1 |
HIP 99003 |
10.87 |
| 2026-06-15 12:00 |
20:05:02.67 |
-40:06:42.9 |
HIP 99003 |
13.42 |
| 2026-06-16 00:00 |
20:04:49.97 |
-40:07:46.3 |
HIP 99003 |
16.01 |
| 2026-06-16 12:00 |
20:04:37.20 |
-40:08:49.6 |
HIP 98774 |
15.14 |
| 2026-06-17 00:00 |
20:04:24.37 |
-40:09:52.5 |
HIP 98774 |
14.28 |
| 2026-06-17 12:00 |
20:04:11.47 |
-40:10:55.2 |
HIP 98774 |
13.87 |
| 2026-06-18 00:00 |
20:03:58.50 |
-40:11:57.5 |
HIP 98774 |
13.97 |
| 2026-06-18 12:00 |
20:03:45.48 |
-40:12:59.6 |
HIP 98774 |
14.57 |
| 2026-06-19 00:00 |
20:03:32.38 |
-40:14:01.4 |
HIP 98774 |
15.61 |
| 2026-06-19 12:00 |
20:03:19.23 |
-40:15:02.8 |
HIP 98774 |
17.02 |
| 2026-06-20 00:00 |
20:03:06.02 |
-40:16:04.0 |
HIP 98774 |
18.72 |
| 2026-06-20 12:00 |
20:02:52.75 |
-40:17:04.8 |
HIP 98774 |
20.64 |
| 2026-06-21 00:00 |
20:02:39.42 |
-40:18:05.3 |
HIP 98774 |
22.72 |
| 2026-06-21 12:00 |
20:02:26.03 |
-40:19:05.5 |
HIP 98501 |
21.13 |
| 2026-06-22 00:00 |
20:02:12.58 |
-40:20:05.3 |
HIP 98501 |
19.13 |