C/2023 H1 (PANSTARRS)
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
$$
M_a = (4.096 + 5.932\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.096 |
| n |
5.932 |
| gf |
0.935 |
| gb |
-0.957 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
-5.0212 |
+4.463 |
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) |
| 2026-02-03 00:00 |
21:12:08.38 |
-07:10:53.4 |
HIP 104720 |
9.81 |
| 2026-02-03 12:00 |
21:12:33.58 |
-07:08:07.3 |
HIP 104720 |
3.67 |
| 2026-02-04 00:00 |
21:12:58.76 |
-07:05:20.9 |
HIP 104720 |
4.92 |
| 2026-02-04 12:00 |
21:13:23.91 |
-07:02:34.1 |
HIP 104720 |
11.32 |
| 2026-02-05 00:00 |
21:13:49.04 |
-06:59:47.0 |
HIP 104897 |
17.14 |
| 2026-02-05 12:00 |
21:14:14.15 |
-06:56:59.6 |
HIP 104897 |
12.98 |
| 2026-02-06 00:00 |
21:14:39.23 |
-06:54:11.9 |
HIP 104897 |
11.68 |
| 2026-02-06 12:00 |
21:15:04.28 |
-06:51:23.9 |
HIP 104897 |
14.06 |
| 2026-02-07 00:00 |
21:15:29.31 |
-06:48:35.6 |
HIP 104897 |
18.76 |
| 2026-02-07 12:00 |
21:15:54.31 |
-06:45:46.9 |
HIP 104897 |
24.48 |
| 2026-02-08 00:00 |
21:16:19.28 |
-06:42:58.0 |
HIP 104897 |
30.65 |
| 2026-02-08 12:00 |
21:16:44.22 |
-06:40:08.8 |
HIP 105225 |
34.63 |
| 2026-02-09 00:00 |
21:17:09.14 |
-06:37:19.2 |
HIP 105225 |
27.83 |
| 2026-02-09 12:00 |
21:17:34.02 |
-06:34:29.4 |
HIP 105225 |
21.04 |
| 2026-02-10 00:00 |
21:17:58.87 |
-06:31:39.2 |
HIP 105225 |
14.25 |
| 2026-02-10 12:00 |
21:18:23.70 |
-06:28:48.8 |
HIP 105225 |
7.48 |
| 2026-02-11 00:00 |
21:18:48.49 |
-06:25:58.0 |
HIP 105225 |
0.98 |
| 2026-02-11 12:00 |
21:19:13.24 |
-06:23:07.0 |
HIP 105225 |
6.16 |
| 2026-02-12 00:00 |
21:19:37.97 |
-06:20:15.7 |
HIP 105225 |
12.91 |
| 2026-02-12 12:00 |
21:20:02.66 |
-06:17:24.2 |
HIP 105225 |
19.68 |
| 2026-02-13 00:00 |
21:20:27.32 |
-06:14:32.3 |
HIP 105225 |
26.44 |
| 2026-02-13 12:00 |
21:20:51.94 |
-06:11:40.2 |
HIP 105575 |
31.71 |
| 2026-02-14 00:00 |
21:21:16.53 |
-06:08:47.8 |
HIP 105575 |
26.04 |
| 2026-02-14 12:00 |
21:21:41.08 |
-06:05:55.1 |
HIP 105575 |
21.02 |
| 2026-02-15 00:00 |
21:22:05.60 |
-06:03:02.1 |
HIP 105575 |
17.23 |
| 2026-02-15 12:00 |
21:22:30.08 |
-06:00:08.9 |
HIP 105575 |
15.59 |
| 2026-02-16 00:00 |
21:22:54.52 |
-05:57:15.5 |
HIP 105575 |
16.74 |
| 2026-02-16 12:00 |
21:23:18.92 |
-05:54:21.8 |
HIP 105550 |
19.40 |
| 2026-02-17 00:00 |
21:23:43.28 |
-05:51:27.8 |
HIP 105550 |
21.28 |
| 2026-02-17 12:00 |
21:24:07.60 |
-05:48:33.6 |
HIP 105717 |
16.25 |
| 2026-02-18 00:00 |
21:24:31.88 |
-05:45:39.1 |
HIP 105717 |
11.12 |
| 2026-02-18 12:00 |
21:24:56.12 |
-05:42:44.4 |
HIP 105717 |
8.54 |
| 2026-02-19 00:00 |
21:25:20.32 |
-05:39:49.5 |
HIP 105717 |
10.57 |
| 2026-02-19 12:00 |
21:25:44.47 |
-05:36:54.3 |
HIP 105717 |
15.48 |
| 2026-02-20 00:00 |
21:26:08.58 |
-05:33:58.9 |
HIP 105717 |
21.36 |
| 2026-02-20 12:00 |
21:26:32.65 |
-05:31:03.3 |
HIP 105994 |
23.08 |
| 2026-02-21 00:00 |
21:26:56.67 |
-05:28:07.5 |
HIP 105994 |
18.63 |
| 2026-02-21 12:00 |
21:27:20.65 |
-05:25:11.4 |
HIP 105994 |
15.82 |
| 2026-02-22 00:00 |
21:27:44.58 |
-05:22:15.1 |
HIP 105994 |
15.56 |
| 2026-02-22 12:00 |
21:28:08.47 |
-05:19:18.7 |
HIP 105994 |
17.95 |
| 2026-02-23 00:00 |
21:28:32.31 |
-05:16:22.0 |
HIP 105994 |
22.14 |
| 2026-02-23 12:00 |
21:28:56.10 |
-05:13:25.1 |
HIP 105994 |
27.31 |
| 2026-02-24 00:00 |
21:29:19.84 |
-05:10:28.0 |
HIP 105994 |
33.00 |