メタデータ
| 項目 |
値 |
| Designation |
C/2026 B3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-05-05T02:40:01.796160Z |
| Orbit solution date (soln_date, UTC) |
2026-05-08T13:42:12Z |
| Obs used |
421 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
10.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2026-01-29T11:54:51.033600Z |
| Discovery magnitude (MPC) |
20.01 i |
| 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) |
2026-02-15.0000000 |
| e |
0.99488719 |
| q (au) |
5.815606 |
| a (au) |
1137.458472 |
| i (deg) |
100.833719 |
| Ω (om, deg) |
346.254877 |
| ω (w, deg) |
205.206198 |
| M (ma, deg) |
359.988590 |
等級
散乱 + 全体線形
$$
M_a = (2.970 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.970 |
| n |
6.000 |
| gf |
0.908 |
| gb |
-0.967 |
| 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 |
| 2025-01-08 |
2026-05-13 |
+14.6305 |
-11.975 |
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 |
10:56:03.37 |
+16:13:30.8 |
HIP 53453 |
4.52 |
| 2026-05-12 12:00 |
10:55:49.83 |
+16:11:16.5 |
HIP 53453 |
4.27 |
| 2026-05-13 00:00 |
10:55:36.47 |
+16:09:01.4 |
HIP 53453 |
6.82 |
| 2026-05-13 12:00 |
10:55:23.30 |
+16:06:45.5 |
HIP 53453 |
10.23 |
| 2026-05-14 00:00 |
10:55:10.31 |
+16:04:28.8 |
HIP 53453 |
13.86 |
| 2026-05-14 12:00 |
10:54:57.51 |
+16:02:11.4 |
HIP 53453 |
17.56 |
| 2026-05-15 00:00 |
10:54:44.89 |
+15:59:53.3 |
HIP 53453 |
21.27 |
| 2026-05-15 12:00 |
10:54:32.46 |
+15:57:34.4 |
HIP 53453 |
24.97 |
| 2026-05-16 00:00 |
10:54:20.21 |
+15:55:14.7 |
HIP 53453 |
28.66 |
| 2026-05-16 12:00 |
10:54:08.15 |
+15:52:54.3 |
HIP 53453 |
32.34 |
| 2026-05-17 00:00 |
10:53:56.27 |
+15:50:33.2 |
HIP 53124 |
31.18 |
| 2026-05-17 12:00 |
10:53:44.57 |
+15:48:11.4 |
HIP 53124 |
30.08 |
| 2026-05-18 00:00 |
10:53:33.06 |
+15:45:48.9 |
HIP 53124 |
29.43 |
| 2026-05-18 12:00 |
10:53:21.73 |
+15:43:25.6 |
HIP 53124 |
29.27 |
| 2026-05-19 00:00 |
10:53:10.59 |
+15:41:01.7 |
HIP 53124 |
29.58 |
| 2026-05-19 12:00 |
10:52:59.63 |
+15:38:37.0 |
HIP 53124 |
30.35 |
| 2026-05-20 00:00 |
10:52:48.85 |
+15:36:11.7 |
HIP 53124 |
31.53 |
| 2026-05-20 12:00 |
10:52:38.26 |
+15:33:45.7 |
HIP 53124 |
33.08 |
| 2026-05-21 00:00 |
10:52:27.84 |
+15:31:19.0 |
HIP 53124 |
34.93 |
| 2026-05-21 12:00 |
10:52:17.61 |
+15:28:51.7 |
HIP 53124 |
37.04 |
| 2026-05-22 00:00 |
10:52:07.56 |
+15:26:23.7 |
HIP 53124 |
39.35 |
| 2026-05-22 12:00 |
10:51:57.69 |
+15:23:55.0 |
HIP 52932 |
40.56 |
| 2026-05-23 00:00 |
10:51:48.00 |
+15:21:25.8 |
HIP 52932 |
37.32 |
| 2026-05-23 12:00 |
10:51:38.48 |
+15:18:55.8 |
HIP 52932 |
34.14 |
| 2026-05-24 00:00 |
10:51:29.15 |
+15:16:25.3 |
HIP 52932 |
31.05 |
| 2026-05-24 12:00 |
10:51:20.00 |
+15:13:54.1 |
HIP 52932 |
28.05 |
| 2026-05-25 00:00 |
10:51:11.02 |
+15:11:22.3 |
HIP 52932 |
25.18 |
| 2026-05-25 12:00 |
10:51:02.22 |
+15:08:49.9 |
HIP 52932 |
22.48 |
| 2026-05-26 00:00 |
10:50:53.59 |
+15:06:16.9 |
HIP 52932 |
20.00 |
| 2026-05-26 12:00 |
10:50:45.15 |
+15:03:43.3 |
HIP 52932 |
17.83 |
| 2026-05-27 00:00 |
10:50:36.87 |
+15:01:09.2 |
HIP 52932 |
16.08 |
| 2026-05-27 12:00 |
10:50:28.77 |
+14:58:34.4 |
HIP 52932 |
14.88 |
| 2026-05-28 00:00 |
10:50:20.85 |
+14:55:59.0 |
HIP 52932 |
14.38 |
| 2026-05-28 12:00 |
10:50:13.10 |
+14:53:23.1 |
HIP 52932 |
14.61 |
| 2026-05-29 00:00 |
10:50:05.52 |
+14:50:46.6 |
HIP 52932 |
15.55 |
| 2026-05-29 12:00 |
10:49:58.11 |
+14:48:09.6 |
HIP 52897 |
13.65 |
| 2026-05-30 00:00 |
10:49:50.87 |
+14:45:32.0 |
HIP 52897 |
11.02 |
| 2026-05-30 12:00 |
10:49:43.81 |
+14:42:53.9 |
HIP 52897 |
8.80 |
| 2026-05-31 00:00 |
10:49:36.91 |
+14:40:15.2 |
HIP 52897 |
7.34 |
| 2026-05-31 12:00 |
10:49:30.18 |
+14:37:36.0 |
HIP 52897 |
7.09 |
| 2026-06-01 00:00 |
10:49:23.63 |
+14:34:56.2 |
HIP 52897 |
8.15 |
| 2026-06-01 12:00 |
10:49:17.24 |
+14:32:15.9 |
HIP 52897 |
10.11 |
| 2026-06-02 00:00 |
10:49:11.01 |
+14:29:35.1 |
HIP 52897 |
12.54 |