메타데이터
| 항목 |
값 |
| Designation |
C/2021 T1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-10-14T01:40:49.874880Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:43:17Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
11.500 |
| K1 |
13.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-10-02T04:59:50.640000Z |
| Discovery magnitude (MPC) |
20.04 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-12-07.0000000 |
| e |
0.99796291 |
| q (au) |
3.058012 |
| a (au) |
1501.163873 |
| i (deg) |
140.350038 |
| Ω (om, deg) |
56.816270 |
| ω (w, deg) |
51.501528 |
| M (ma, deg) |
0.000914 |
밝기
산란 + 전체 선형
$$
M_a = (10.107 + 5.998\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.107 |
| n |
5.998 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.999 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
15:57:22.99 |
-16:19:11.8 |
HIP 78120 |
17.66 |
| 2026-06-01 12:00 |
15:57:11.73 |
-16:18:57.8 |
HIP 78120 |
16.98 |
| 2026-06-02 00:00 |
15:57:00.49 |
-16:18:43.8 |
HIP 78120 |
16.71 |
| 2026-06-02 12:00 |
15:56:49.28 |
-16:18:29.9 |
HIP 78120 |
16.88 |
| 2026-06-03 00:00 |
15:56:38.09 |
-16:18:16.2 |
HIP 78120 |
17.47 |
| 2026-06-03 12:00 |
15:56:26.92 |
-16:18:02.5 |
HIP 78120 |
18.44 |
| 2026-06-04 00:00 |
15:56:15.78 |
-16:17:48.9 |
HIP 78120 |
19.73 |
| 2026-06-04 12:00 |
15:56:04.66 |
-16:17:35.5 |
HIP 78120 |
21.27 |
| 2026-06-05 00:00 |
15:55:53.57 |
-16:17:22.1 |
HIP 78120 |
23.03 |
| 2026-06-05 12:00 |
15:55:42.50 |
-16:17:08.9 |
HIP 78120 |
24.94 |
| 2026-06-06 00:00 |
15:55:31.47 |
-16:16:55.8 |
HIP 78120 |
26.98 |
| 2026-06-06 12:00 |
15:55:20.46 |
-16:16:42.8 |
HIP 78120 |
29.11 |
| 2026-06-07 00:00 |
15:55:09.49 |
-16:16:29.9 |
HIP 78120 |
31.31 |
| 2026-06-07 12:00 |
15:54:58.54 |
-16:16:17.1 |
HIP 77793 |
32.02 |
| 2026-06-08 00:00 |
15:54:47.62 |
-16:16:04.5 |
HIP 77793 |
30.00 |
| 2026-06-08 12:00 |
15:54:36.74 |
-16:15:52.0 |
HIP 77793 |
28.09 |
| 2026-06-09 00:00 |
15:54:25.89 |
-16:15:39.6 |
HIP 77793 |
26.29 |
| 2026-06-09 12:00 |
15:54:15.07 |
-16:15:27.3 |
HIP 77793 |
24.65 |
| 2026-06-10 00:00 |
15:54:04.29 |
-16:15:15.2 |
HIP 77793 |
23.19 |
| 2026-06-10 12:00 |
15:53:53.54 |
-16:15:03.2 |
HIP 77793 |
21.94 |
| 2026-06-11 00:00 |
15:53:42.83 |
-16:14:51.4 |
HIP 77793 |
20.94 |
| 2026-06-11 12:00 |
15:53:32.16 |
-16:14:39.6 |
HIP 77793 |
20.21 |
| 2026-06-12 00:00 |
15:53:21.52 |
-16:14:28.1 |
HIP 77793 |
19.80 |
| 2026-06-12 12:00 |
15:53:10.92 |
-16:14:16.6 |
HIP 77793 |
19.71 |
| 2026-06-13 00:00 |
15:53:00.36 |
-16:14:05.4 |
HIP 77793 |
19.95 |
| 2026-06-13 12:00 |
15:52:49.84 |
-16:13:54.2 |
HIP 77793 |
20.49 |
| 2026-06-14 00:00 |
15:52:39.37 |
-16:13:43.2 |
HIP 77793 |
21.32 |
| 2026-06-14 12:00 |
15:52:28.93 |
-16:13:32.4 |
HIP 77793 |
22.39 |
| 2026-06-15 00:00 |
15:52:18.54 |
-16:13:21.7 |
HIP 77793 |
23.68 |
| 2026-06-15 12:00 |
15:52:08.19 |
-16:13:11.2 |
HIP 77793 |
25.14 |
| 2026-06-16 00:00 |
15:51:57.88 |
-16:13:00.8 |
HIP 77793 |
26.75 |
| 2026-06-16 12:00 |
15:51:47.62 |
-16:12:50.6 |
HIP 77793 |
28.47 |
| 2026-06-17 00:00 |
15:51:37.40 |
-16:12:40.6 |
HIP 77663 |
28.06 |
| 2026-06-17 12:00 |
15:51:27.23 |
-16:12:30.7 |
HIP 77663 |
27.57 |
| 2026-06-18 00:00 |
15:51:17.11 |
-16:12:21.0 |
HIP 77663 |
27.30 |
| 2026-06-18 12:00 |
15:51:07.04 |
-16:12:11.5 |
HIP 77663 |
27.25 |
| 2026-06-19 00:00 |
15:50:57.01 |
-16:12:02.1 |
HIP 77663 |
27.41 |
| 2026-06-19 12:00 |
15:50:47.04 |
-16:11:52.9 |
HIP 77663 |
27.78 |
| 2026-06-20 00:00 |
15:50:37.11 |
-16:11:43.9 |
HIP 77663 |
28.35 |
| 2026-06-20 12:00 |
15:50:27.23 |
-16:11:35.0 |
HIP 77663 |
29.11 |
| 2026-06-21 00:00 |
15:50:17.41 |
-16:11:26.4 |
HIP 77663 |
30.03 |
| 2026-06-21 12:00 |
15:50:07.63 |
-16:11:17.9 |
HIP 77663 |
31.10 |
| 2026-06-22 00:00 |
15:49:57.91 |
-16:11:09.5 |
HIP 77663 |
32.30 |