메타데이터
| 항목 |
값 |
| Designation |
C/2021 C5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-02-11T00:59:44.805120Z |
| Orbit solution date (soln_date, UTC) |
2024-07-08T10:14:37Z |
| Obs used |
456 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
5.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-02-12T08:17:13.660800Z |
| Discovery magnitude (MPC) |
21.01 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2022-03-02.0000000 |
| e |
0.99926635 |
| q (au) |
3.241820 |
| a (au) |
4418.763332 |
| i (deg) |
50.784623 |
| Ω (om, deg) |
323.689906 |
| ω (w, deg) |
270.917360 |
| M (ma, deg) |
359.998839 |
밝기
산란 + 전체 선형
$$
M_a = (12.668 + 3.655\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.668 |
| n |
3.655 |
| gf |
1.000 |
| gb |
-0.758 |
| k |
0.800 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2020-12-22 |
2022-01-05 |
+4.2672 |
-3.352 |
| 2022-01-05 |
2022-06-07 |
+5.6932 |
-3.927 |
| 2022-06-07 |
2023-02-07 |
-20.1432 |
+11.501 |
| 2023-02-16 |
2024-07-03 |
+12.5302 |
-5.302 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
22:23:03.50 |
+05:31:25.6 |
HIP 110513 |
7.92 |
| 2026-03-26 12:00 |
22:23:13.28 |
+05:33:20.0 |
HIP 110513 |
5.49 |
| 2026-03-27 00:00 |
22:23:23.02 |
+05:35:14.5 |
HIP 110513 |
4.07 |
| 2026-03-27 12:00 |
22:23:32.72 |
+05:37:09.1 |
HIP 110513 |
4.68 |
| 2026-03-28 00:00 |
22:23:42.36 |
+05:39:03.7 |
HIP 110513 |
6.79 |
| 2026-03-28 12:00 |
22:23:51.96 |
+05:40:58.4 |
HIP 110513 |
9.42 |
| 2026-03-29 00:00 |
22:24:01.52 |
+05:42:53.1 |
HIP 110513 |
12.25 |
| 2026-03-29 12:00 |
22:24:11.02 |
+05:44:47.9 |
HIP 110544 |
15.03 |
| 2026-03-30 00:00 |
22:24:20.48 |
+05:46:42.7 |
HIP 110544 |
14.98 |
| 2026-03-30 12:00 |
22:24:29.88 |
+05:48:37.5 |
HIP 110544 |
15.52 |
| 2026-03-31 00:00 |
22:24:39.24 |
+05:50:32.4 |
HIP 110544 |
16.59 |
| 2026-03-31 12:00 |
22:24:48.55 |
+05:52:27.3 |
HIP 110544 |
18.09 |
| 2026-04-01 00:00 |
22:24:57.81 |
+05:54:22.2 |
HIP 110544 |
19.93 |
| 2026-04-01 12:00 |
22:25:07.01 |
+05:56:17.2 |
HIP 110544 |
22.00 |
| 2026-04-02 00:00 |
22:25:16.17 |
+05:58:12.1 |
HIP 110574 |
23.28 |
| 2026-04-02 12:00 |
22:25:25.27 |
+06:00:07.1 |
HIP 110574 |
24.11 |
| 2026-04-03 00:00 |
22:25:34.33 |
+06:02:02.1 |
HIP 110574 |
25.25 |
| 2026-04-03 12:00 |
22:25:43.33 |
+06:03:57.2 |
HIP 110574 |
26.66 |
| 2026-04-04 00:00 |
22:25:52.28 |
+06:05:52.2 |
HIP 110574 |
28.30 |
| 2026-04-04 12:00 |
22:26:01.17 |
+06:07:47.2 |
HIP 110782 |
26.69 |
| 2026-04-05 00:00 |
22:26:10.01 |
+06:09:42.3 |
HIP 110782 |
24.21 |
| 2026-04-05 12:00 |
22:26:18.80 |
+06:11:37.3 |
HIP 110782 |
21.83 |
| 2026-04-06 00:00 |
22:26:27.53 |
+06:13:32.3 |
HIP 110782 |
19.60 |
| 2026-04-06 12:00 |
22:26:36.21 |
+06:15:27.4 |
HIP 110782 |
17.57 |
| 2026-04-07 00:00 |
22:26:44.83 |
+06:17:22.4 |
HIP 110782 |
15.80 |
| 2026-04-07 12:00 |
22:26:53.39 |
+06:19:17.4 |
HIP 110782 |
14.39 |
| 2026-04-08 00:00 |
22:27:01.90 |
+06:21:12.4 |
HIP 110782 |
13.44 |
| 2026-04-08 12:00 |
22:27:10.36 |
+06:23:07.3 |
HIP 110782 |
13.04 |
| 2026-04-09 00:00 |
22:27:18.75 |
+06:25:02.3 |
HIP 110782 |
13.25 |
| 2026-04-09 12:00 |
22:27:27.09 |
+06:26:57.2 |
HIP 110782 |
14.03 |
| 2026-04-10 00:00 |
22:27:35.37 |
+06:28:52.0 |
HIP 110782 |
15.28 |
| 2026-04-10 12:00 |
22:27:43.59 |
+06:30:46.9 |
HIP 110782 |
16.89 |
| 2026-04-11 00:00 |
22:27:51.75 |
+06:32:41.7 |
HIP 110782 |
18.77 |
| 2026-04-11 12:00 |
22:27:59.85 |
+06:34:36.4 |
HIP 110782 |
20.84 |
| 2026-04-12 00:00 |
22:28:07.89 |
+06:36:31.1 |
HIP 110870 |
21.87 |
| 2026-04-12 12:00 |
22:28:15.87 |
+06:38:25.8 |
HIP 110870 |
20.73 |
| 2026-04-13 00:00 |
22:28:23.79 |
+06:40:20.4 |
HIP 110870 |
19.90 |
| 2026-04-13 12:00 |
22:28:31.65 |
+06:42:15.0 |
HIP 110870 |
19.42 |
| 2026-04-14 00:00 |
22:28:39.44 |
+06:44:09.4 |
HIP 110870 |
19.31 |
| 2026-04-14 12:00 |
22:28:47.18 |
+06:46:03.9 |
HIP 110870 |
19.56 |
| 2026-04-15 00:00 |
22:28:54.85 |
+06:47:58.2 |
HIP 110870 |
20.16 |
| 2026-04-15 12:00 |
22:29:02.45 |
+06:49:52.5 |
HIP 110870 |
21.08 |
| 2026-04-16 00:00 |
22:29:10.00 |
+06:51:46.7 |
HIP 110870 |
22.27 |