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) |
| 2026-07-29 00:00 |
20:01:54.43 |
+25:05:43.9 |
HIP 98636 |
9.59 |
| 2026-07-29 12:00 |
20:01:44.53 |
+25:05:07.5 |
HIP 98636 |
9.64 |
| 2026-07-30 00:00 |
20:01:34.66 |
+25:04:30.0 |
HIP 98636 |
10.22 |
| 2026-07-30 12:00 |
20:01:24.80 |
+25:03:51.6 |
HIP 98636 |
11.24 |
| 2026-07-31 00:00 |
20:01:14.97 |
+25:03:12.2 |
HIP 98636 |
12.59 |
| 2026-07-31 12:00 |
20:01:05.16 |
+25:02:31.8 |
HIP 98636 |
14.19 |
| 2026-08-01 00:00 |
20:00:55.38 |
+25:01:50.5 |
HIP 98436 |
14.90 |
| 2026-08-01 12:00 |
20:00:45.62 |
+25:01:08.1 |
HIP 98436 |
13.65 |
| 2026-08-02 00:00 |
20:00:35.89 |
+25:00:24.8 |
HIP 98436 |
12.71 |
| 2026-08-02 12:00 |
20:00:26.19 |
+24:59:40.6 |
HIP 98436 |
12.17 |
| 2026-08-03 00:00 |
20:00:16.52 |
+24:58:55.3 |
HIP 98436 |
12.08 |
| 2026-08-03 12:00 |
20:00:06.88 |
+24:58:09.2 |
HIP 98436 |
12.44 |
| 2026-08-04 00:00 |
19:59:57.26 |
+24:57:22.0 |
HIP 98436 |
13.22 |
| 2026-08-04 12:00 |
19:59:47.68 |
+24:56:34.0 |
HIP 98397 |
13.59 |
| 2026-08-05 00:00 |
19:59:38.13 |
+24:55:45.0 |
HIP 98397 |
12.41 |
| 2026-08-05 12:00 |
19:59:28.62 |
+24:54:55.0 |
HIP 98397 |
11.56 |
| 2026-08-06 00:00 |
19:59:19.14 |
+24:54:04.1 |
HIP 98397 |
11.12 |
| 2026-08-06 12:00 |
19:59:09.69 |
+24:53:12.3 |
HIP 98397 |
11.13 |
| 2026-08-07 00:00 |
19:59:00.29 |
+24:52:19.6 |
HIP 98397 |
11.60 |
| 2026-08-07 12:00 |
19:58:50.92 |
+24:51:26.0 |
HIP 98397 |
12.46 |
| 2026-08-08 00:00 |
19:58:41.58 |
+24:50:31.5 |
HIP 98397 |
13.65 |
| 2026-08-08 12:00 |
19:58:32.29 |
+24:49:36.0 |
HIP 98397 |
15.09 |
| 2026-08-09 00:00 |
19:58:23.04 |
+24:48:39.7 |
HIP 98397 |
16.71 |
| 2026-08-09 12:00 |
19:58:13.83 |
+24:47:42.5 |
HIP 98397 |
18.46 |
| 2026-08-10 00:00 |
19:58:04.66 |
+24:46:44.4 |
HIP 98142 |
18.40 |
| 2026-08-10 12:00 |
19:57:55.54 |
+24:45:45.4 |
HIP 98142 |
16.46 |
| 2026-08-11 00:00 |
19:57:46.46 |
+24:44:45.5 |
HIP 98142 |
14.64 |
| 2026-08-11 12:00 |
19:57:37.43 |
+24:43:44.8 |
HIP 98142 |
12.97 |
| 2026-08-12 00:00 |
19:57:28.44 |
+24:42:43.2 |
HIP 98142 |
11.54 |
| 2026-08-12 12:00 |
19:57:19.50 |
+24:41:40.8 |
HIP 98142 |
10.43 |
| 2026-08-13 00:00 |
19:57:10.61 |
+24:40:37.5 |
HIP 98142 |
9.76 |
| 2026-08-13 12:00 |
19:57:01.77 |
+24:39:33.4 |
HIP 98142 |
9.61 |
| 2026-08-14 00:00 |
19:56:52.98 |
+24:38:28.5 |
HIP 98142 |
10.00 |
| 2026-08-14 12:00 |
19:56:44.24 |
+24:37:22.7 |
HIP 98142 |
10.88 |
| 2026-08-15 00:00 |
19:56:35.56 |
+24:36:16.2 |
HIP 98142 |
12.14 |
| 2026-08-15 12:00 |
19:56:26.92 |
+24:35:08.8 |
HIP 98142 |
13.67 |
| 2026-08-16 00:00 |
19:56:18.34 |
+24:34:00.6 |
HIP 98142 |
15.38 |
| 2026-08-16 12:00 |
19:56:09.82 |
+24:32:51.7 |
HIP 98142 |
17.23 |
| 2026-08-17 00:00 |
19:56:01.35 |
+24:31:42.0 |
HIP 98142 |
19.17 |
| 2026-08-17 12:00 |
19:55:52.94 |
+24:30:31.5 |
HIP 98142 |
21.17 |
| 2026-08-18 00:00 |
19:55:44.59 |
+24:29:20.2 |
HIP 97961 |
19.59 |
| 2026-08-18 12:00 |
19:55:36.29 |
+24:28:08.2 |
HIP 97961 |
17.35 |
| 2026-08-19 00:00 |
19:55:28.06 |
+24:26:55.5 |
HIP 97961 |
15.12 |