メタデータ
| 項目 |
値 |
| Designation |
C/2023 H1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-11-28T15:40:24.548160Z |
| Orbit solution date (soln_date, UTC) |
2026-09-29T13:12:10Z |
| Obs used |
782 |
| NEO |
- |
| M1 |
4.800 |
| K1 |
14.250 |
| 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) |
2025-05-05.0000000 |
| e |
0.99413788 |
| q (au) |
4.447622 |
| a (au) |
758.705154 |
| i (deg) |
21.782531 |
| Ω (om, deg) |
292.646744 |
| ω (w, deg) |
333.753984 |
| M (ma, deg) |
0.007421 |
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) |
| 2026-09-25 00:00 |
21:52:09.86 |
+06:02:50.7 |
HIP 107948 |
25.23 |
| 2026-09-25 12:00 |
21:52:02.32 |
+06:01:55.1 |
HIP 107948 |
24.38 |
| 2026-09-26 00:00 |
21:51:54.90 |
+06:00:59.5 |
HIP 107948 |
23.69 |
| 2026-09-26 12:00 |
21:51:47.59 |
+06:00:03.9 |
HIP 107948 |
23.15 |
| 2026-09-27 00:00 |
21:51:40.40 |
+05:59:08.2 |
HIP 107948 |
22.77 |
| 2026-09-27 12:00 |
21:51:33.32 |
+05:58:12.5 |
HIP 107948 |
22.55 |
| 2026-09-28 00:00 |
21:51:26.35 |
+05:57:16.7 |
HIP 107948 |
22.50 |
| 2026-09-28 12:00 |
21:51:19.50 |
+05:56:21.0 |
HIP 107948 |
22.60 |
| 2026-09-29 00:00 |
21:51:12.76 |
+05:55:25.2 |
HIP 107948 |
22.85 |
| 2026-09-29 12:00 |
21:51:06.15 |
+05:54:29.5 |
HIP 107948 |
23.23 |
| 2026-09-30 00:00 |
21:50:59.65 |
+05:53:33.8 |
HIP 107948 |
23.74 |
| 2026-09-30 12:00 |
21:50:53.27 |
+05:52:38.1 |
HIP 107948 |
24.35 |
| 2026-10-01 00:00 |
21:50:47.01 |
+05:51:42.4 |
HIP 107948 |
25.06 |
| 2026-10-01 12:00 |
21:50:40.87 |
+05:50:46.8 |
HIP 107948 |
25.86 |
| 2026-10-02 00:00 |
21:50:34.85 |
+05:49:51.3 |
HIP 107948 |
26.72 |
| 2026-10-02 12:00 |
21:50:28.95 |
+05:48:55.9 |
HIP 107677 |
26.27 |
| 2026-10-03 00:00 |
21:50:23.18 |
+05:48:00.5 |
HIP 107677 |
24.92 |
| 2026-10-03 12:00 |
21:50:17.53 |
+05:47:05.2 |
HIP 107677 |
23.65 |
| 2026-10-04 00:00 |
21:50:12.00 |
+05:46:10.1 |
HIP 107677 |
22.45 |
| 2026-10-04 12:00 |
21:50:06.60 |
+05:45:15.1 |
HIP 107677 |
21.35 |
| 2026-10-05 00:00 |
21:50:01.33 |
+05:44:20.2 |
HIP 107677 |
20.35 |
| 2026-10-05 12:00 |
21:49:56.18 |
+05:43:25.4 |
HIP 107677 |
19.46 |
| 2026-10-06 00:00 |
21:49:51.16 |
+05:42:30.8 |
HIP 107677 |
18.68 |
| 2026-10-06 12:00 |
21:49:46.26 |
+05:41:36.3 |
HIP 107677 |
18.03 |
| 2026-10-07 00:00 |
21:49:41.50 |
+05:40:42.1 |
HIP 107677 |
17.51 |
| 2026-10-07 12:00 |
21:49:36.86 |
+05:39:48.0 |
HIP 107677 |
17.13 |
| 2026-10-08 00:00 |
21:49:32.36 |
+05:38:54.1 |
HIP 107677 |
16.89 |
| 2026-10-08 12:00 |
21:49:27.98 |
+05:38:00.5 |
HIP 107677 |
16.79 |
| 2026-10-09 00:00 |
21:49:23.74 |
+05:37:07.0 |
HIP 107677 |
16.82 |
| 2026-10-09 12:00 |
21:49:19.63 |
+05:36:13.8 |
HIP 107677 |
16.98 |
| 2026-10-10 00:00 |
21:49:15.65 |
+05:35:20.8 |
HIP 107677 |
17.26 |
| 2026-10-10 12:00 |
21:49:11.80 |
+05:34:28.1 |
HIP 107677 |
17.64 |
| 2026-10-11 00:00 |
21:49:08.09 |
+05:33:35.7 |
HIP 107677 |
18.11 |
| 2026-10-11 12:00 |
21:49:04.51 |
+05:32:43.5 |
HIP 107677 |
18.66 |
| 2026-10-12 00:00 |
21:49:01.06 |
+05:31:51.6 |
HIP 107677 |
19.28 |
| 2026-10-12 12:00 |
21:48:57.75 |
+05:31:00.0 |
HIP 107677 |
19.96 |
| 2026-10-13 00:00 |
21:48:54.57 |
+05:30:08.7 |
HIP 107677 |
20.68 |
| 2026-10-13 12:00 |
21:48:51.53 |
+05:29:17.8 |
HIP 107677 |
21.44 |
| 2026-10-14 00:00 |
21:48:48.62 |
+05:28:27.1 |
HIP 107764 |
22.11 |
| 2026-10-14 12:00 |
21:48:45.85 |
+05:27:36.8 |
HIP 107764 |
22.03 |
| 2026-10-15 00:00 |
21:48:43.21 |
+05:26:46.9 |
HIP 107764 |
21.98 |
| 2026-10-15 12:00 |
21:48:40.71 |
+05:25:57.3 |
HIP 107764 |
21.95 |
| 2026-10-16 00:00 |
21:48:38.35 |
+05:25:08.0 |
HIP 107764 |
21.95 |