메타데이터
| 항목 |
값 |
| Designation |
C/2021 A6 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-05-04T03:17:13.050240Z |
| Orbit solution date (soln_date, UTC) |
2024-08-02T01:42:19Z |
| Obs used |
167 |
| NEO |
- |
| M1 |
5.100 |
| K1 |
12.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-01-08T14:28:45.120000Z |
| Discovery magnitude (MPC) |
20.89 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2022-03-24.0000000 |
| e |
0.99923094 |
| q (au) |
7.928456 |
| a (au) |
10309.304354 |
| i (deg) |
75.612049 |
| Ω (om, deg) |
164.079307 |
| ω (w, deg) |
351.692611 |
| M (ma, deg) |
0.000305 |
밝기
산란 + 전체 선형
$$
M_a = (5.232 + 4.625\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
5.232 |
| n |
4.625 |
| gf |
0.972 |
| gb |
-0.874 |
| k |
1.000 |
| δ90 |
9.788 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
15:09:01.09 |
+53:31:45.9 |
HIP 74094 |
16.55 |
| 2026-07-29 12:00 |
15:09:02.15 |
+53:30:02.5 |
HIP 74094 |
14.93 |
| 2026-07-30 00:00 |
15:09:03.33 |
+53:28:18.8 |
HIP 74094 |
13.35 |
| 2026-07-30 12:00 |
15:09:04.61 |
+53:26:34.9 |
HIP 74094 |
11.81 |
| 2026-07-31 00:00 |
15:09:06.01 |
+53:24:50.8 |
HIP 74094 |
10.33 |
| 2026-07-31 12:00 |
15:09:07.52 |
+53:23:06.4 |
HIP 74094 |
8.97 |
| 2026-08-01 00:00 |
15:09:09.13 |
+53:21:21.8 |
HIP 74094 |
7.76 |
| 2026-08-01 12:00 |
15:09:10.86 |
+53:19:37.0 |
HIP 74094 |
6.82 |
| 2026-08-02 00:00 |
15:09:12.69 |
+53:17:52.0 |
HIP 74094 |
6.26 |
| 2026-08-02 12:00 |
15:09:14.64 |
+53:16:06.7 |
HIP 74094 |
6.19 |
| 2026-08-03 00:00 |
15:09:16.69 |
+53:14:21.3 |
HIP 74094 |
6.64 |
| 2026-08-03 12:00 |
15:09:18.86 |
+53:12:35.7 |
HIP 74094 |
7.51 |
| 2026-08-04 00:00 |
15:09:21.13 |
+53:10:49.9 |
HIP 74094 |
8.68 |
| 2026-08-04 12:00 |
15:09:23.51 |
+53:09:03.9 |
HIP 74094 |
10.06 |
| 2026-08-05 00:00 |
15:09:26.00 |
+53:07:17.8 |
HIP 74094 |
11.56 |
| 2026-08-05 12:00 |
15:09:28.60 |
+53:05:31.5 |
HIP 74094 |
13.15 |
| 2026-08-06 00:00 |
15:09:31.30 |
+53:03:45.0 |
HIP 74094 |
14.81 |
| 2026-08-06 12:00 |
15:09:34.12 |
+53:01:58.4 |
HIP 74094 |
16.51 |
| 2026-08-07 00:00 |
15:09:37.04 |
+53:00:11.7 |
HIP 74094 |
18.25 |
| 2026-08-07 12:00 |
15:09:40.07 |
+52:58:24.8 |
HIP 74019 |
18.93 |
| 2026-08-08 00:00 |
15:09:43.21 |
+52:56:37.8 |
HIP 74019 |
19.60 |
| 2026-08-08 12:00 |
15:09:46.46 |
+52:54:50.7 |
HIP 74019 |
20.43 |
| 2026-08-09 00:00 |
15:09:49.82 |
+52:53:03.5 |
HIP 74019 |
21.40 |
| 2026-08-09 12:00 |
15:09:53.28 |
+52:51:16.2 |
HIP 74019 |
22.51 |
| 2026-08-10 00:00 |
15:09:56.85 |
+52:49:28.8 |
HIP 74193 |
23.05 |
| 2026-08-10 12:00 |
15:10:00.53 |
+52:47:41.3 |
HIP 74193 |
21.35 |
| 2026-08-11 00:00 |
15:10:04.31 |
+52:45:53.8 |
HIP 74193 |
19.69 |
| 2026-08-11 12:00 |
15:10:08.20 |
+52:44:06.1 |
HIP 74193 |
18.08 |
| 2026-08-12 00:00 |
15:10:12.20 |
+52:42:18.5 |
HIP 74193 |
16.53 |
| 2026-08-12 12:00 |
15:10:16.30 |
+52:40:30.7 |
HIP 74193 |
15.07 |
| 2026-08-13 00:00 |
15:10:20.51 |
+52:38:42.9 |
HIP 74193 |
13.72 |
| 2026-08-13 12:00 |
15:10:24.82 |
+52:36:55.1 |
HIP 74193 |
12.52 |
| 2026-08-14 00:00 |
15:10:29.24 |
+52:35:07.3 |
HIP 74193 |
11.53 |
| 2026-08-14 12:00 |
15:10:33.76 |
+52:33:19.4 |
HIP 74193 |
10.81 |
| 2026-08-15 00:00 |
15:10:38.39 |
+52:31:31.6 |
HIP 74205 |
9.99 |
| 2026-08-15 12:00 |
15:10:43.13 |
+52:29:43.7 |
HIP 74205 |
9.45 |
| 2026-08-16 00:00 |
15:10:47.96 |
+52:27:55.9 |
HIP 74205 |
9.30 |
| 2026-08-16 12:00 |
15:10:52.90 |
+52:26:08.0 |
HIP 74205 |
9.58 |
| 2026-08-17 00:00 |
15:10:57.95 |
+52:24:20.2 |
HIP 74205 |
10.24 |
| 2026-08-17 12:00 |
15:11:03.09 |
+52:22:32.4 |
HIP 74205 |
11.23 |
| 2026-08-18 00:00 |
15:11:08.34 |
+52:20:44.7 |
HIP 74205 |
12.46 |
| 2026-08-18 12:00 |
15:11:13.69 |
+52:18:56.9 |
HIP 74205 |
13.88 |
| 2026-08-19 00:00 |
15:11:19.14 |
+52:17:09.3 |
HIP 74205 |
15.43 |