メタデータ
| 項目 |
値 |
| Designation |
C/2023 H1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-11-28T15:51:32.506560Z |
| Orbit solution date (soln_date, UTC) |
2025-12-18T15:12:22Z |
| Obs used |
733 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
12.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-04-17T08:21:30.268800Z |
| Discovery magnitude (MPC) |
20.80 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) |
2025-04-15.0000000 |
| e |
0.99412834 |
| q (au) |
4.447633 |
| a (au) |
757.474344 |
| i (deg) |
21.782467 |
| Ω (om, deg) |
292.646754 |
| ω (w, deg) |
333.755152 |
| M (ma, deg) |
0.006493 |
等級
散乱 + 全体線形
$$
M_a = (4.558 + 5.313\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.558 |
| n |
5.313 |
| gf |
1.000 |
| gb |
-0.963 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2023-04-17 |
2024-09-05 |
-3.7302 |
+3.621 |
| 2025-03-10 |
2025-11-15 |
-7.2442 |
+4.804 |
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 |
22:15:08.63 |
+02:25:14.8 |
HIP 109807 |
20.11 |
| 2026-05-12 12:00 |
22:15:18.45 |
+02:27:55.6 |
HIP 109807 |
19.42 |
| 2026-05-13 00:00 |
22:15:28.14 |
+02:30:35.9 |
HIP 109807 |
19.37 |
| 2026-05-13 12:00 |
22:15:37.70 |
+02:33:15.7 |
HIP 109807 |
19.96 |
| 2026-05-14 00:00 |
22:15:47.13 |
+02:35:55.1 |
HIP 109807 |
21.12 |
| 2026-05-14 12:00 |
22:15:56.43 |
+02:38:34.0 |
HIP 109807 |
22.75 |
| 2026-05-15 00:00 |
22:16:05.59 |
+02:41:12.4 |
HIP 109807 |
24.74 |
| 2026-05-15 12:00 |
22:16:14.63 |
+02:43:50.3 |
HIP 109807 |
27.01 |
| 2026-05-16 00:00 |
22:16:23.52 |
+02:46:27.7 |
HIP 110099 |
26.89 |
| 2026-05-16 12:00 |
22:16:32.29 |
+02:49:04.5 |
HIP 110099 |
25.13 |
| 2026-05-17 00:00 |
22:16:40.92 |
+02:51:40.9 |
HIP 110099 |
23.75 |
| 2026-05-17 12:00 |
22:16:49.42 |
+02:54:16.7 |
HIP 110099 |
22.82 |
| 2026-05-18 00:00 |
22:16:57.78 |
+02:56:52.0 |
HIP 109947 |
22.15 |
| 2026-05-18 12:00 |
22:17:06.01 |
+02:59:26.8 |
HIP 109947 |
21.51 |
| 2026-05-19 00:00 |
22:17:14.11 |
+03:02:01.0 |
HIP 109947 |
21.36 |
| 2026-05-19 12:00 |
22:17:22.06 |
+03:04:34.7 |
HIP 109947 |
21.67 |
| 2026-05-20 00:00 |
22:17:29.88 |
+03:07:07.8 |
HIP 109947 |
22.42 |
| 2026-05-20 12:00 |
22:17:37.57 |
+03:09:40.4 |
HIP 109947 |
23.56 |
| 2026-05-21 00:00 |
22:17:45.12 |
+03:12:12.4 |
HIP 109947 |
25.02 |
| 2026-05-21 12:00 |
22:17:52.53 |
+03:14:43.8 |
HIP 109947 |
26.74 |
| 2026-05-22 00:00 |
22:17:59.80 |
+03:17:14.7 |
HIP 109947 |
28.66 |
| 2026-05-22 12:00 |
22:18:06.94 |
+03:19:45.0 |
HIP 109947 |
30.74 |
| 2026-05-23 00:00 |
22:18:13.94 |
+03:22:14.6 |
HIP 109947 |
32.94 |
| 2026-05-23 12:00 |
22:18:20.80 |
+03:24:43.7 |
HIP 109947 |
35.24 |
| 2026-05-24 00:00 |
22:18:27.53 |
+03:27:12.3 |
HIP 109947 |
37.59 |
| 2026-05-24 12:00 |
22:18:34.11 |
+03:29:40.2 |
HIP 110163 |
39.15 |
| 2026-05-25 00:00 |
22:18:40.56 |
+03:32:07.5 |
HIP 110163 |
36.56 |
| 2026-05-25 12:00 |
22:18:46.87 |
+03:34:34.2 |
HIP 110163 |
34.04 |
| 2026-05-26 00:00 |
22:18:53.04 |
+03:37:00.2 |
HIP 110163 |
31.59 |
| 2026-05-26 12:00 |
22:18:59.07 |
+03:39:25.7 |
HIP 110163 |
29.23 |
| 2026-05-27 00:00 |
22:19:04.96 |
+03:41:50.5 |
HIP 110163 |
26.96 |
| 2026-05-27 12:00 |
22:19:10.71 |
+03:44:14.7 |
HIP 110163 |
24.82 |
| 2026-05-28 00:00 |
22:19:16.32 |
+03:46:38.3 |
HIP 110163 |
22.82 |
| 2026-05-28 12:00 |
22:19:21.79 |
+03:49:01.2 |
HIP 110163 |
21.00 |
| 2026-05-29 00:00 |
22:19:27.13 |
+03:51:23.5 |
HIP 110163 |
19.38 |
| 2026-05-29 12:00 |
22:19:32.32 |
+03:53:45.2 |
HIP 110163 |
18.03 |
| 2026-05-30 00:00 |
22:19:37.37 |
+03:56:06.1 |
HIP 110163 |
16.97 |
| 2026-05-30 12:00 |
22:19:42.28 |
+03:58:26.5 |
HIP 110163 |
16.27 |
| 2026-05-31 00:00 |
22:19:47.05 |
+04:00:46.1 |
HIP 110163 |
15.96 |
| 2026-05-31 12:00 |
22:19:51.67 |
+04:03:05.1 |
HIP 110163 |
16.04 |
| 2026-06-01 00:00 |
22:19:56.16 |
+04:05:23.4 |
HIP 110163 |
16.50 |
| 2026-06-01 12:00 |
22:20:00.50 |
+04:07:41.0 |
HIP 110163 |
17.29 |
| 2026-06-02 00:00 |
22:20:04.70 |
+04:09:57.9 |
HIP 110163 |
18.36 |