메타데이터
| 항목 |
값 |
| Designation |
C/2018 R3 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-06-07T04:45:17.421120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:46Z |
| Obs used |
272 |
| NEO |
- |
| M1 |
11.300 |
| K1 |
11.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-09-07T03:53:59.136000Z |
| Discovery magnitude (MPC) |
19.20 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-02-24.0000000 |
| e |
0.99934491 |
| q (au) |
1.290602 |
| a (au) |
1970.100092 |
| i (deg) |
69.715410 |
| Ω (om, deg) |
324.626026 |
| ω (w, deg) |
112.875459 |
| M (ma, deg) |
359.998837 |
밝기
산란 + 전체 선형
$$
M_a = (9.265 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.265 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.875 |
| k |
0.998 |
| 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 |
| 2018-08-08 |
2019-06-07 |
-0.2234 |
+0.114 |
| 2019-06-07 |
2020-03-03 |
+8.0397 |
-3.207 |
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 |
09:34:38.22 |
-71:31:54.6 |
HIP 47188 |
14.76 |
| 2026-03-26 12:00 |
09:34:24.48 |
-71:30:55.1 |
HIP 47188 |
16.23 |
| 2026-03-27 00:00 |
09:34:10.88 |
-71:29:54.9 |
HIP 46661 |
16.68 |
| 2026-03-27 12:00 |
09:33:57.42 |
-71:28:54.1 |
HIP 46661 |
16.02 |
| 2026-03-28 00:00 |
09:33:44.10 |
-71:27:52.7 |
HIP 46661 |
15.48 |
| 2026-03-28 12:00 |
09:33:30.93 |
-71:26:50.6 |
HIP 46661 |
15.08 |
| 2026-03-29 00:00 |
09:33:17.90 |
-71:25:48.0 |
HIP 46661 |
14.83 |
| 2026-03-29 12:00 |
09:33:05.01 |
-71:24:44.8 |
HIP 46661 |
14.73 |
| 2026-03-30 00:00 |
09:32:52.27 |
-71:23:41.1 |
HIP 46661 |
14.80 |
| 2026-03-30 12:00 |
09:32:39.67 |
-71:22:36.7 |
HIP 46661 |
15.02 |
| 2026-03-31 00:00 |
09:32:27.23 |
-71:21:31.8 |
HIP 46661 |
15.39 |
| 2026-03-31 12:00 |
09:32:14.92 |
-71:20:26.3 |
HIP 46661 |
15.91 |
| 2026-04-01 00:00 |
09:32:02.77 |
-71:19:20.3 |
HIP 46661 |
16.54 |
| 2026-04-01 12:00 |
09:31:50.76 |
-71:18:13.7 |
HIP 46661 |
17.29 |
| 2026-04-02 00:00 |
09:31:38.91 |
-71:17:06.6 |
HIP 46661 |
18.14 |
| 2026-04-02 12:00 |
09:31:27.20 |
-71:15:59.0 |
HIP 46661 |
19.08 |
| 2026-04-03 00:00 |
09:31:15.65 |
-71:14:50.9 |
HIP 46661 |
20.08 |
| 2026-04-03 12:00 |
09:31:04.24 |
-71:13:42.2 |
HIP 46661 |
21.15 |
| 2026-04-04 00:00 |
09:30:52.99 |
-71:12:33.0 |
HIP 46661 |
22.27 |
| 2026-04-04 12:00 |
09:30:41.89 |
-71:11:23.4 |
HIP 46957 |
23.31 |
| 2026-04-05 00:00 |
09:30:30.94 |
-71:10:13.2 |
HIP 46957 |
23.26 |
| 2026-04-05 12:00 |
09:30:20.14 |
-71:09:02.6 |
HIP 46957 |
23.28 |
| 2026-04-06 00:00 |
09:30:09.50 |
-71:07:51.5 |
HIP 46957 |
23.38 |
| 2026-04-06 12:00 |
09:29:59.02 |
-71:06:39.9 |
HIP 46957 |
23.56 |
| 2026-04-07 00:00 |
09:29:48.68 |
-71:05:27.8 |
HIP 46957 |
23.81 |
| 2026-04-07 12:00 |
09:29:38.51 |
-71:04:15.4 |
HIP 46957 |
24.14 |
| 2026-04-08 00:00 |
09:29:28.49 |
-71:03:02.4 |
HIP 46957 |
24.54 |
| 2026-04-08 12:00 |
09:29:18.62 |
-71:01:49.0 |
HIP 46957 |
25.00 |
| 2026-04-09 00:00 |
09:29:08.91 |
-71:00:35.2 |
HIP 46957 |
25.53 |
| 2026-04-09 12:00 |
09:28:59.36 |
-70:59:21.0 |
HIP 46957 |
26.12 |
| 2026-04-10 00:00 |
09:28:49.97 |
-70:58:06.3 |
HIP 46957 |
26.76 |
| 2026-04-10 12:00 |
09:28:40.73 |
-70:56:51.3 |
HIP 46957 |
27.46 |
| 2026-04-11 00:00 |
09:28:31.65 |
-70:55:35.8 |
HIP 46957 |
28.20 |
| 2026-04-11 12:00 |
09:28:22.73 |
-70:54:20.0 |
HIP 46957 |
28.99 |
| 2026-04-12 00:00 |
09:28:13.97 |
-70:53:03.7 |
HIP 46957 |
29.81 |
| 2026-04-12 12:00 |
09:28:05.37 |
-70:51:47.1 |
HIP 46755 |
29.82 |
| 2026-04-13 00:00 |
09:27:56.92 |
-70:50:30.1 |
HIP 46215 |
28.86 |
| 2026-04-13 12:00 |
09:27:48.64 |
-70:49:12.8 |
HIP 46215 |
27.40 |
| 2026-04-14 00:00 |
09:27:40.51 |
-70:47:55.1 |
HIP 46215 |
25.94 |
| 2026-04-14 12:00 |
09:27:32.55 |
-70:46:37.1 |
HIP 46215 |
24.49 |
| 2026-04-15 00:00 |
09:27:24.74 |
-70:45:18.7 |
HIP 46215 |
23.03 |
| 2026-04-15 12:00 |
09:27:17.10 |
-70:44:00.0 |
HIP 46215 |
21.58 |
| 2026-04-16 00:00 |
09:27:09.62 |
-70:42:41.0 |
HIP 46215 |
20.12 |