메타데이터
| 항목 |
값 |
| Designation |
C/2020 S3 (Erasmus) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-12-12T16:07:52.118400Z |
| Orbit solution date (soln_date, UTC) |
2024-04-29T13:12:18Z |
| Obs used |
861 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
4.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-09-17T14:40:43.536000Z |
| Discovery magnitude (MPC) |
18.48 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-03-11.0000000 |
| e |
0.99795482 |
| q (au) |
0.398469 |
| a (au) |
194.833484 |
| i (deg) |
19.861463 |
| Ω (om, deg) |
222.992545 |
| ω (w, deg) |
349.885700 |
| M (ma, deg) |
0.032012 |
밝기
산란 + 전체 선형
$$
M_a = (10.351 + 5.209\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.351 |
| n |
5.209 |
| gf |
1.000 |
| gb |
-0.883 |
| k |
0.958 |
| 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 |
| 2020-09-17 |
2020-10-17 |
+19.9760 |
-1.996 |
| 2020-10-17 |
2020-11-05 |
-0.9147 |
-0.033 |
| 2020-11-05 |
2020-12-09 |
-2.1755 |
-0.819 |
| 2020-12-18 |
2020-12-28 |
+3.4301 |
+1.116 |
| 2020-12-28 |
2021-07-09 |
-1.2827 |
-0.363 |
| 2021-07-09 |
2021-09-12 |
+18.1641 |
-11.091 |
| 2021-09-12 |
2021-11-27 |
-10.8184 |
+6.846 |
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 |
00:45:44.88 |
+14:10:18.4 |
HIP 3550 |
12.87 |
| 2026-03-26 12:00 |
00:45:51.66 |
+14:10:55.9 |
HIP 3550 |
13.18 |
| 2026-03-27 00:00 |
00:45:58.45 |
+14:11:33.5 |
HIP 3633 |
11.73 |
| 2026-03-27 12:00 |
00:46:05.24 |
+14:12:11.2 |
HIP 3633 |
10.11 |
| 2026-03-28 00:00 |
00:46:12.03 |
+14:12:49.1 |
HIP 3633 |
8.56 |
| 2026-03-28 12:00 |
00:46:18.83 |
+14:13:27.1 |
HIP 3633 |
7.10 |
| 2026-03-29 00:00 |
00:46:25.62 |
+14:14:05.3 |
HIP 3633 |
5.81 |
| 2026-03-29 12:00 |
00:46:32.42 |
+14:14:43.6 |
HIP 3633 |
4.82 |
| 2026-03-30 00:00 |
00:46:39.22 |
+14:15:22.0 |
HIP 3633 |
4.36 |
| 2026-03-30 12:00 |
00:46:46.02 |
+14:16:00.6 |
HIP 3633 |
4.59 |
| 2026-03-31 00:00 |
00:46:52.82 |
+14:16:39.2 |
HIP 3633 |
5.41 |
| 2026-03-31 12:00 |
00:46:59.62 |
+14:17:18.1 |
HIP 3633 |
6.61 |
| 2026-04-01 00:00 |
00:47:06.43 |
+14:17:57.0 |
HIP 3633 |
8.03 |
| 2026-04-01 12:00 |
00:47:13.23 |
+14:18:36.0 |
HIP 3633 |
9.57 |
| 2026-04-02 00:00 |
00:47:20.03 |
+14:19:15.2 |
HIP 3633 |
11.17 |
| 2026-04-02 12:00 |
00:47:26.82 |
+14:19:54.5 |
HIP 3633 |
12.82 |
| 2026-04-03 00:00 |
00:47:33.62 |
+14:20:33.9 |
HIP 3633 |
14.50 |
| 2026-04-03 12:00 |
00:47:40.42 |
+14:21:13.4 |
HIP 3633 |
16.19 |
| 2026-04-04 00:00 |
00:47:47.21 |
+14:21:53.1 |
HIP 3633 |
17.90 |
| 2026-04-04 12:00 |
00:47:54.00 |
+14:22:32.8 |
HIP 3633 |
19.63 |
| 2026-04-05 00:00 |
00:48:00.78 |
+14:23:12.6 |
HIP 3633 |
21.36 |
| 2026-04-05 12:00 |
00:48:07.57 |
+14:23:52.6 |
HIP 3633 |
23.09 |
| 2026-04-06 00:00 |
00:48:14.35 |
+14:24:32.6 |
HIP 3633 |
24.83 |
| 2026-04-06 12:00 |
00:48:21.12 |
+14:25:12.8 |
HIP 3823 |
25.61 |
| 2026-04-07 00:00 |
00:48:27.89 |
+14:25:53.0 |
HIP 3823 |
24.35 |
| 2026-04-07 12:00 |
00:48:34.66 |
+14:26:33.3 |
HIP 3823 |
23.16 |
| 2026-04-08 00:00 |
00:48:41.42 |
+14:27:13.8 |
HIP 3823 |
22.05 |
| 2026-04-08 12:00 |
00:48:48.17 |
+14:27:54.3 |
HIP 3823 |
21.03 |
| 2026-04-09 00:00 |
00:48:54.92 |
+14:28:34.9 |
HIP 3823 |
20.11 |
| 2026-04-09 12:00 |
00:49:01.66 |
+14:29:15.5 |
HIP 3823 |
19.31 |
| 2026-04-10 00:00 |
00:49:08.40 |
+14:29:56.3 |
HIP 3823 |
18.64 |
| 2026-04-10 12:00 |
00:49:15.13 |
+14:30:37.2 |
HIP 3823 |
18.11 |
| 2026-04-11 00:00 |
00:49:21.85 |
+14:31:18.1 |
HIP 3823 |
17.74 |
| 2026-04-11 12:00 |
00:49:28.56 |
+14:31:59.1 |
HIP 3823 |
17.55 |
| 2026-04-12 00:00 |
00:49:35.26 |
+14:32:40.1 |
HIP 3823 |
17.52 |
| 2026-04-12 12:00 |
00:49:41.96 |
+14:33:21.3 |
HIP 3823 |
17.67 |
| 2026-04-13 00:00 |
00:49:48.64 |
+14:34:02.5 |
HIP 3823 |
17.99 |
| 2026-04-13 12:00 |
00:49:55.32 |
+14:34:43.7 |
HIP 3823 |
18.47 |
| 2026-04-14 00:00 |
00:50:01.99 |
+14:35:25.0 |
HIP 3823 |
19.10 |
| 2026-04-14 12:00 |
00:50:08.64 |
+14:36:06.4 |
HIP 3823 |
19.86 |
| 2026-04-15 00:00 |
00:50:15.29 |
+14:36:47.9 |
HIP 3823 |
20.73 |
| 2026-04-15 12:00 |
00:50:21.93 |
+14:37:29.3 |
HIP 3823 |
21.71 |
| 2026-04-16 00:00 |
00:50:28.55 |
+14:38:10.9 |
HIP 3823 |
22.78 |