C/2023 B2 (ATLAS)
メタデータ
| 項目 |
値 |
| Designation |
C/2023 B2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-03-10T11:54:03.790080Z |
| Orbit solution date (soln_date, UTC) |
2023-12-12T20:44:25Z |
| Obs used |
1107 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
34.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2023-01-21T23:14:22.070400Z |
| Discovery magnitude (MPC) |
18.82 c |
| Discovery observatory (MPC) |
M22 · ATLAS South Africa, Sutherland |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-04-20.0000000 |
| e |
0.99712391 |
| q (au) |
1.743129 |
| a (au) |
606.075015 |
| i (deg) |
40.770763 |
| Ω (om, deg) |
218.120594 |
| ω (w, deg) |
317.399433 |
| M (ma, deg) |
0.002676 |
等級
散乱 + 全体線形
$$
M_a = (13.836 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.836 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2022-11-16 |
2023-03-09 |
+18.9790 |
-4.051 |
| 2023-03-11 |
2023-05-22 |
+44.4170 |
-11.509 |
| 2023-05-22 |
2023-07-17 |
-28.8936 |
+9.864 |
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 |
19:59:13.47 |
+17:36:06.6 |
HIP 98438 |
12.93 |
| 2026-02-03 12:00 |
19:59:26.49 |
+17:37:11.7 |
HIP 98443 |
9.97 |
| 2026-02-04 00:00 |
19:59:39.48 |
+17:38:17.7 |
HIP 98443 |
7.06 |
| 2026-02-04 12:00 |
19:59:52.44 |
+17:39:24.3 |
HIP 98443 |
4.68 |
| 2026-02-05 00:00 |
20:00:05.36 |
+17:40:31.6 |
HIP 98443 |
3.95 |
| 2026-02-05 12:00 |
20:00:18.25 |
+17:41:39.6 |
HIP 98443 |
5.55 |
| 2026-02-06 00:00 |
20:00:31.11 |
+17:42:48.3 |
HIP 98443 |
8.22 |
| 2026-02-06 12:00 |
20:00:43.93 |
+17:43:57.8 |
HIP 98443 |
11.21 |
| 2026-02-07 00:00 |
20:00:56.72 |
+17:45:07.9 |
HIP 98443 |
14.32 |
| 2026-02-07 12:00 |
20:01:09.47 |
+17:46:18.7 |
HIP 98443 |
17.49 |
| 2026-02-08 00:00 |
20:01:22.18 |
+17:47:30.2 |
HIP 98646 |
20.51 |
| 2026-02-08 12:00 |
20:01:34.86 |
+17:48:42.4 |
HIP 98646 |
19.96 |
| 2026-02-09 00:00 |
20:01:47.50 |
+17:49:55.3 |
HIP 98646 |
19.94 |
| 2026-02-09 12:00 |
20:02:00.10 |
+17:51:08.9 |
HIP 98646 |
20.46 |
| 2026-02-10 00:00 |
20:02:12.66 |
+17:52:23.1 |
HIP 98646 |
21.47 |
| 2026-02-10 12:00 |
20:02:25.19 |
+17:53:38.0 |
HIP 98646 |
22.91 |
| 2026-02-11 00:00 |
20:02:37.67 |
+17:54:53.6 |
HIP 98718 |
23.59 |
| 2026-02-11 12:00 |
20:02:50.11 |
+17:56:09.8 |
HIP 98718 |
21.77 |
| 2026-02-12 00:00 |
20:03:02.52 |
+17:57:26.7 |
HIP 98718 |
20.29 |
| 2026-02-12 12:00 |
20:03:14.87 |
+17:58:44.3 |
HIP 98718 |
19.22 |
| 2026-02-13 00:00 |
20:03:27.19 |
+18:00:02.5 |
HIP 98718 |
18.63 |
| 2026-02-13 12:00 |
20:03:39.47 |
+18:01:21.3 |
HIP 98718 |
18.58 |
| 2026-02-14 00:00 |
20:03:51.70 |
+18:02:40.8 |
HIP 98718 |
19.05 |
| 2026-02-14 12:00 |
20:04:03.88 |
+18:04:01.0 |
HIP 98912 |
18.62 |
| 2026-02-15 00:00 |
20:04:16.03 |
+18:05:21.8 |
HIP 98912 |
17.37 |
| 2026-02-15 12:00 |
20:04:28.12 |
+18:06:43.2 |
HIP 98934 |
16.49 |
| 2026-02-16 00:00 |
20:04:40.17 |
+18:08:05.2 |
HIP 98934 |
15.65 |
| 2026-02-16 12:00 |
20:04:52.18 |
+18:09:27.9 |
HIP 98934 |
15.45 |
| 2026-02-17 00:00 |
20:05:04.13 |
+18:10:51.2 |
HIP 98996 |
12.67 |
| 2026-02-17 12:00 |
20:05:16.04 |
+18:12:15.1 |
HIP 98996 |
9.56 |
| 2026-02-18 00:00 |
20:05:27.90 |
+18:13:39.6 |
HIP 98996 |
6.51 |
| 2026-02-18 12:00 |
20:05:39.71 |
+18:15:04.7 |
HIP 98996 |
3.65 |
| 2026-02-19 00:00 |
20:05:51.48 |
+18:16:30.5 |
HIP 98996 |
2.02 |
| 2026-02-19 12:00 |
20:06:03.19 |
+18:17:56.8 |
HIP 98996 |
3.81 |
| 2026-02-20 00:00 |
20:06:14.85 |
+18:19:23.7 |
HIP 98996 |
6.67 |
| 2026-02-20 12:00 |
20:06:26.46 |
+18:20:51.2 |
HIP 98996 |
9.69 |
| 2026-02-21 00:00 |
20:06:38.01 |
+18:22:19.3 |
HIP 98996 |
12.76 |
| 2026-02-21 12:00 |
20:06:49.52 |
+18:23:47.9 |
HIP 98996 |
15.83 |
| 2026-02-22 00:00 |
20:07:00.97 |
+18:25:17.1 |
HIP 98996 |
18.91 |
| 2026-02-22 12:00 |
20:07:12.37 |
+18:26:46.9 |
HIP 99203 |
19.56 |
| 2026-02-23 00:00 |
20:07:23.71 |
+18:28:17.3 |
HIP 99203 |
16.48 |
| 2026-02-23 12:00 |
20:07:35.00 |
+18:29:48.2 |
HIP 99203 |
13.40 |
| 2026-02-24 00:00 |
20:07:46.24 |
+18:31:19.6 |
HIP 99203 |
10.34 |