メタデータ
| 項目 |
値 |
| Designation |
C/2021 O3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-04-21T00:59:54.507840Z |
| Orbit solution date (soln_date, UTC) |
2024-08-08T14:32:18Z |
| Obs used |
760 |
| NEO |
- |
| M1 |
13.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-07-26T11:32:37.104000Z |
| Discovery magnitude (MPC) |
19.87 i |
| 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) |
2021-10-30.0000000 |
| e |
1.00015130 |
| q (au) |
0.287322 |
| a (au) |
-1899.062785 |
| i (deg) |
56.772789 |
| Ω (om, deg) |
189.027335 |
| ω (w, deg) |
299.983286 |
| M (ma, deg) |
-0.002061 |
等級
散乱 + 全体線形
$$
M_a = (15.384 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.384 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.680 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2021-07-26 |
2021-09-18 |
+2.7400 |
-1.427 |
| 2021-09-18 |
2021-11-07 |
+8.8781 |
-4.666 |
| 2021-11-07 |
2021-12-08 |
+4.2020 |
-2.285 |
| 2021-12-08 |
2022-04-19 |
+4.8581 |
-2.406 |
| 2022-04-22 |
2022-07-12 |
-0.0579 |
+1.173 |
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) |
| 2026-03-26 00:00 |
19:46:02.68 |
+32:51:25.6 |
HIP 97307 |
7.05 |
| 2026-03-26 12:00 |
19:46:06.41 |
+32:53:06.2 |
HIP 97307 |
6.01 |
| 2026-03-27 00:00 |
19:46:10.06 |
+32:54:47.0 |
HIP 97307 |
5.44 |
| 2026-03-27 12:00 |
19:46:13.63 |
+32:56:28.0 |
HIP 97307 |
5.49 |
| 2026-03-28 00:00 |
19:46:17.12 |
+32:58:09.1 |
HIP 97307 |
6.12 |
| 2026-03-28 12:00 |
19:46:20.53 |
+32:59:50.4 |
HIP 97307 |
7.20 |
| 2026-03-29 00:00 |
19:46:23.87 |
+33:01:31.9 |
HIP 97307 |
8.54 |
| 2026-03-29 12:00 |
19:46:27.12 |
+33:03:13.5 |
HIP 97307 |
10.05 |
| 2026-03-30 00:00 |
19:46:30.30 |
+33:04:55.3 |
HIP 97307 |
11.65 |
| 2026-03-30 12:00 |
19:46:33.40 |
+33:06:37.2 |
HIP 97307 |
13.31 |
| 2026-03-31 00:00 |
19:46:36.41 |
+33:08:19.2 |
HIP 97307 |
15.01 |
| 2026-03-31 12:00 |
19:46:39.35 |
+33:10:01.4 |
HIP 97307 |
16.73 |
| 2026-04-01 00:00 |
19:46:42.21 |
+33:11:43.7 |
HIP 97307 |
18.47 |
| 2026-04-01 12:00 |
19:46:44.99 |
+33:13:26.1 |
HIP 97307 |
20.23 |
| 2026-04-02 00:00 |
19:46:47.68 |
+33:15:08.6 |
HIP 97266 |
20.37 |
| 2026-04-02 12:00 |
19:46:50.30 |
+33:16:51.2 |
HIP 97266 |
19.11 |
| 2026-04-03 00:00 |
19:46:52.83 |
+33:18:33.9 |
HIP 97266 |
17.94 |
| 2026-04-03 12:00 |
19:46:55.29 |
+33:20:16.7 |
HIP 97266 |
16.86 |
| 2026-04-04 00:00 |
19:46:57.66 |
+33:21:59.6 |
HIP 97266 |
15.90 |
| 2026-04-04 12:00 |
19:46:59.95 |
+33:23:42.6 |
HIP 97266 |
15.07 |
| 2026-04-05 00:00 |
19:47:02.16 |
+33:25:25.6 |
HIP 97266 |
14.41 |
| 2026-04-05 12:00 |
19:47:04.29 |
+33:27:08.7 |
HIP 97266 |
13.92 |
| 2026-04-06 00:00 |
19:47:06.33 |
+33:28:51.8 |
HIP 97266 |
13.63 |
| 2026-04-06 12:00 |
19:47:08.29 |
+33:30:35.0 |
HIP 97266 |
13.55 |
| 2026-04-07 00:00 |
19:47:10.17 |
+33:32:18.3 |
HIP 97266 |
13.68 |
| 2026-04-07 12:00 |
19:47:11.97 |
+33:34:01.5 |
HIP 97295 |
13.68 |
| 2026-04-08 00:00 |
19:47:13.68 |
+33:35:44.8 |
HIP 97295 |
12.80 |
| 2026-04-08 12:00 |
19:47:15.31 |
+33:37:28.2 |
HIP 97295 |
12.09 |
| 2026-04-09 00:00 |
19:47:16.86 |
+33:39:11.5 |
HIP 97295 |
11.59 |
| 2026-04-09 12:00 |
19:47:18.32 |
+33:40:54.9 |
HIP 97295 |
11.32 |
| 2026-04-10 00:00 |
19:47:19.70 |
+33:42:38.2 |
HIP 97295 |
11.31 |
| 2026-04-10 12:00 |
19:47:21.00 |
+33:44:21.6 |
HIP 97295 |
11.54 |
| 2026-04-11 00:00 |
19:47:22.21 |
+33:46:04.9 |
HIP 97295 |
12.00 |
| 2026-04-11 12:00 |
19:47:23.33 |
+33:47:48.2 |
HIP 97295 |
12.68 |
| 2026-04-12 00:00 |
19:47:24.37 |
+33:49:31.5 |
HIP 97295 |
13.53 |
| 2026-04-12 12:00 |
19:47:25.33 |
+33:51:14.7 |
HIP 97295 |
14.52 |
| 2026-04-13 00:00 |
19:47:26.20 |
+33:52:57.9 |
HIP 97295 |
15.62 |
| 2026-04-13 12:00 |
19:47:26.99 |
+33:54:41.1 |
HIP 97295 |
16.82 |
| 2026-04-14 00:00 |
19:47:27.69 |
+33:56:24.2 |
HIP 97295 |
18.09 |
| 2026-04-14 12:00 |
19:47:28.30 |
+33:58:07.2 |
HIP 97295 |
19.41 |
| 2026-04-15 00:00 |
19:47:28.83 |
+33:59:50.2 |
HIP 97379 |
18.44 |
| 2026-04-15 12:00 |
19:47:29.28 |
+34:01:33.0 |
HIP 97379 |
16.72 |
| 2026-04-16 00:00 |
19:47:29.63 |
+34:03:15.8 |
HIP 97379 |
15.01 |