メタデータ
| 項目 |
値 |
| Designation |
C/2022 Q2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-01-31T14:05:21.716160Z |
| Orbit solution date (soln_date, UTC) |
2023-08-06T18:13:02Z |
| Obs used |
591 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
9.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2022-08-27T14:05:17.059200Z |
| Discovery magnitude (MPC) |
19.06 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-11-02.0000000 |
| e |
0.94987994 |
| q (au) |
1.644140 |
| a (au) |
32.804037 |
| i (deg) |
151.486615 |
| Ω (om, deg) |
352.943256 |
| ω (w, deg) |
44.060185 |
| M (ma, deg) |
359.524797 |
等級
散乱 + 全体線形
$$
M_a = (13.015 + 3.982\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.015 |
| n |
3.982 |
| gf |
1.000 |
| gb |
-0.839 |
| k |
0.998 |
| 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 |
| 2022-08-27 |
2022-12-21 |
+0.4118 |
-0.203 |
| 2023-04-03 |
2023-07-16 |
-8.5392 |
+4.736 |
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) |
| 2026-09-20 00:00 |
11:24:21.16 |
+02:25:04.1 |
HIP 55699 |
20.18 |
| 2026-09-20 12:00 |
11:24:28.36 |
+02:24:05.6 |
HIP 55699 |
18.78 |
| 2026-09-21 00:00 |
11:24:35.54 |
+02:23:07.2 |
HIP 55699 |
17.49 |
| 2026-09-21 12:00 |
11:24:42.71 |
+02:22:08.8 |
HIP 55699 |
16.37 |
| 2026-09-22 00:00 |
11:24:49.86 |
+02:21:10.4 |
HIP 55699 |
15.43 |
| 2026-09-22 12:00 |
11:24:57.01 |
+02:20:12.1 |
HIP 55699 |
14.71 |
| 2026-09-23 00:00 |
11:25:04.14 |
+02:19:13.9 |
HIP 55699 |
14.25 |
| 2026-09-23 12:00 |
11:25:11.25 |
+02:18:15.7 |
HIP 55699 |
14.08 |
| 2026-09-24 00:00 |
11:25:18.35 |
+02:17:17.6 |
HIP 55699 |
14.18 |
| 2026-09-24 12:00 |
11:25:25.44 |
+02:16:19.5 |
HIP 55699 |
14.57 |
| 2026-09-25 00:00 |
11:25:32.51 |
+02:15:21.5 |
HIP 55699 |
15.22 |
| 2026-09-25 12:00 |
11:25:39.56 |
+02:14:23.6 |
HIP 55699 |
16.09 |
| 2026-09-26 00:00 |
11:25:46.60 |
+02:13:25.8 |
HIP 55699 |
17.15 |
| 2026-09-26 12:00 |
11:25:53.62 |
+02:12:28.0 |
HIP 55699 |
18.37 |
| 2026-09-27 00:00 |
11:26:00.62 |
+02:11:30.3 |
HIP 55699 |
19.71 |
| 2026-09-27 12:00 |
11:26:07.61 |
+02:10:32.7 |
HIP 55699 |
21.15 |
| 2026-09-28 00:00 |
11:26:14.57 |
+02:09:35.2 |
HIP 55699 |
22.67 |
| 2026-09-28 12:00 |
11:26:21.52 |
+02:08:37.8 |
HIP 55699 |
24.25 |
| 2026-09-29 00:00 |
11:26:28.45 |
+02:07:40.5 |
HIP 55699 |
25.88 |
| 2026-09-29 12:00 |
11:26:35.36 |
+02:06:43.2 |
HIP 55699 |
27.56 |
| 2026-09-30 00:00 |
11:26:42.24 |
+02:05:46.1 |
HIP 55699 |
29.26 |
| 2026-09-30 12:00 |
11:26:49.11 |
+02:04:49.0 |
HIP 56008 |
30.39 |
| 2026-10-01 00:00 |
11:26:55.96 |
+02:03:52.1 |
HIP 56008 |
28.44 |
| 2026-10-01 12:00 |
11:27:02.78 |
+02:02:55.3 |
HIP 56008 |
26.50 |
| 2026-10-02 00:00 |
11:27:09.58 |
+02:01:58.6 |
HIP 56008 |
24.56 |
| 2026-10-02 12:00 |
11:27:16.36 |
+02:01:01.9 |
HIP 56008 |
22.64 |
| 2026-10-03 00:00 |
11:27:23.12 |
+02:00:05.4 |
HIP 56008 |
20.72 |
| 2026-10-03 12:00 |
11:27:29.85 |
+01:59:09.1 |
HIP 56008 |
18.80 |
| 2026-10-04 00:00 |
11:27:36.56 |
+01:58:12.8 |
HIP 56008 |
16.90 |
| 2026-10-04 12:00 |
11:27:43.24 |
+01:57:16.7 |
HIP 56008 |
15.01 |
| 2026-10-05 00:00 |
11:27:49.90 |
+01:56:20.7 |
HIP 56008 |
13.14 |
| 2026-10-05 12:00 |
11:27:56.53 |
+01:55:24.8 |
HIP 56008 |
11.28 |
| 2026-10-06 00:00 |
11:28:03.14 |
+01:54:29.1 |
HIP 56008 |
9.45 |
| 2026-10-06 12:00 |
11:28:09.72 |
+01:53:33.5 |
HIP 56008 |
7.65 |
| 2026-10-07 00:00 |
11:28:16.27 |
+01:52:38.0 |
HIP 56008 |
5.91 |
| 2026-10-07 12:00 |
11:28:22.79 |
+01:51:42.7 |
HIP 56008 |
4.31 |
| 2026-10-08 00:00 |
11:28:29.29 |
+01:50:47.6 |
HIP 56008 |
3.03 |
| 2026-10-08 12:00 |
11:28:35.75 |
+01:49:52.5 |
HIP 56008 |
2.61 |
| 2026-10-09 00:00 |
11:28:42.19 |
+01:48:57.7 |
HIP 56008 |
3.36 |
| 2026-10-09 12:00 |
11:28:48.60 |
+01:48:03.0 |
HIP 56008 |
4.75 |
| 2026-10-10 00:00 |
11:28:54.97 |
+01:47:08.5 |
HIP 56008 |
6.36 |
| 2026-10-10 12:00 |
11:29:01.31 |
+01:46:14.1 |
HIP 56008 |
8.07 |
| 2026-10-11 00:00 |
11:29:07.62 |
+01:45:19.9 |
HIP 56008 |
9.81 |